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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 3
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SUBLEVEL = 0
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EXTRAVERSION = -rc4
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NAME = Bobtail Squid
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# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

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# That's our default target when none is given on the command line
PHONY := _all
_all:

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# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
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# unavoidable when linking the built-in.a targets which finally
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# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

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ifneq ($(sub_make_done),1)
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# Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour)
MAKEFLAGS += -rR

# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC

# Avoid interference with shell env settings
unexport GREP_OPTIONS

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# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
#	$(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
#
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# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

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ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
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endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

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ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
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  quiet=silent_
endif

export quiet Q KBUILD_VERBOSE

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# Kbuild will save output files in the current working directory.
# This does not need to match to the root of the kernel source tree.
#
# For example, you can do this:
#
#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
#
# If you want to save output files in a different location, there are
# two syntaxes to specify it.
#
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# 1) O=
# Use "make O=dir/to/store/output/files/"
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#
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# 2) Set KBUILD_OUTPUT
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# Set the environment variable KBUILD_OUTPUT to point to the output directory.
# export KBUILD_OUTPUT=dir/to/store/output/files/; make
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#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

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# Do we want to change the working directory?
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ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
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endif

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ifneq ($(KBUILD_OUTPUT),)
# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
# expand a shell special character '~'. We use a somewhat tedious way here.
abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
$(if $(abs_objtree),, \
     $(error failed to create output directory "$(KBUILD_OUTPUT)"))

# $(realpath ...) resolves symlinks
abs_objtree := $(realpath $(abs_objtree))
else
abs_objtree := $(CURDIR)
endif # ifneq ($(KBUILD_OUTPUT),)

ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." unless we are changing the work directory.
MAKEFLAGS += --no-print-directory
else
need-sub-make := 1
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endif

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abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
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ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
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ifneq ($(abs_srctree),$(abs_objtree))
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# Look for make include files relative to root of kernel src
#
# This does not become effective immediately because MAKEFLAGS is re-parsed
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# once after the Makefile is read. We need to invoke sub-make.
MAKEFLAGS += --include-dir=$(abs_srctree)
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need-sub-make := 1
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endif
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ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
$(lastword $(MAKEFILE_LIST)): ;
endif

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export abs_srctree abs_objtree
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export sub_make_done := 1

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ifeq ($(need-sub-make),1)

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PHONY += $(MAKECMDGOALS) sub-make

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$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
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	@:
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# Invoke a second make in the output directory, passing relevant variables
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sub-make:
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	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
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endif # need-sub-make
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endif # sub_make_done
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# We process the rest of the Makefile if this is the final invocation of make
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ifeq ($(need-sub-make),)
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# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

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# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
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ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
  KBUILD_CHECKSRC = 0
endif

# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
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  $(warning ================= WARNING ================)
  $(warning 'SUBDIRS' will be removed after Linux 5.3)
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  $(warning )
  $(warning If you are building an individual subdirectory)
  $(warning in the kernel tree, you can do like this:)
  $(warning $$ make path/to/dir/you/want/to/build/)
  $(warning (Do not forget the trailing slash))
  $(warning )
  $(warning If you are building an external module,)
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  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
  $(warning ==========================================)
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  KBUILD_EXTMOD ?= $(SUBDIRS)
endif

ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

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export KBUILD_CHECKSRC KBUILD_EXTMOD

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ifeq ($(abs_srctree),$(abs_objtree))
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        # building in the source tree
        srctree := .
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	building_out_of_srctree :=
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else
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        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
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                # building in a subdirectory of the source tree
                srctree := ..
        else
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                srctree := $(abs_srctree)
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        endif
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	building_out_of_srctree := 1
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endif
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ifneq ($(KBUILD_ABS_SRCTREE),)
srctree := $(abs_srctree)
endif
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objtree		:= .
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VPATH		:= $(srctree)
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export building_out_of_srctree srctree objtree VPATH
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# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

version_h := include/generated/uapi/linux/version.h
old_version_h := include/linux/version.h

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clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
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			 cscope gtags TAGS tags help% %docs check% coccicheck \
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			 $(version_h) headers headers_% archheaders archscripts \
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			 %asm-generic kernelversion %src-pkg
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no-sync-config-targets := $(no-dot-config-targets) install %install \
			   kernelrelease
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config-targets  := 0
mixed-targets   := 0
dot-config      := 1
may-sync-config := 1
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ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
		dot-config := 0
	endif
endif

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ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
		may-sync-config := 0
	endif
endif

ifneq ($(KBUILD_EXTMOD),)
	may-sync-config := 0
endif

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ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(words $(MAKECMDGOALS)),1)
                        mixed-targets := 1
                endif
        endif
endif
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# For "make -j clean all", "make -j mrproper defconfig all", etc.
ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
                mixed-targets := 1
        endif
endif

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# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
	        mixed-targets := 1
        endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

PHONY += $(MAKECMDGOALS) __build_one_by_one

$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
	@:

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done

else

include scripts/Kbuild.include

# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION

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include scripts/subarch.include
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# Cross compiling and selecting different set of gcc/bin-utils
# ---------------------------------------------------------------------------
#
# When performing cross compilation for other architectures ARCH shall be set
# to the target architecture. (See arch/* for the possibilities).
# ARCH can be set during invocation of make:
# make ARCH=ia64
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
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ARCH		?= $(SUBARCH)
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# Architecture as present in compile.h
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UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
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# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
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# Additional ARCH settings for sparc
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ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
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ifeq ($(ARCH),sparc64)
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       SRCARCH := sparc
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endif
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# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

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KCONFIG_CONFIG	?= .config
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export KCONFIG_CONFIG
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# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	  else if [ -x /bin/bash ]; then echo /bin/bash; \
	  else echo sh; fi ; fi)

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HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
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HOSTCC       = gcc
HOSTCXX      = g++
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KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
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		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
		$(HOSTCFLAGS)
KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
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# Make variables (CC, etc...)
AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
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OBJSIZE		= $(CROSS_COMPILE)size
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PAHOLE		= pahole
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LEX		= flex
YACC		= bison
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AWK		= awk
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INSTALLKERNEL  := installkernel
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DEPMOD		= /sbin/depmod
PERL		= perl
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PYTHON		= python
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PYTHON2		= python2
PYTHON3		= python3
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CHECK		= sparse

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CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
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		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
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NOSTDINC_FLAGS :=
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CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
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CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
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LDFLAGS_vmlinux =
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# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
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		-I$(srctree)/include/uapi \
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		-I$(objtree)/include/generated/uapi \
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                -include $(srctree)/include/linux/kconfig.h

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# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
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LINUXINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
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		$(if $(building_out_of_srctree),-I$(srctree)/include) \
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		-I$(objtree)/include \
		$(USERINCLUDE)
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KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
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KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
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		   -Werror=implicit-function-declaration -Werror=implicit-int \
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		   -Wno-format-security \
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		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
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KBUILD_LDFLAGS :=
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GCC_PLUGINS_CFLAGS :=
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CLANG_FLAGS :=
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export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
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export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
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export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
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export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
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export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
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export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
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export KBUILD_ARFLAGS
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# Files to ignore in find ... statements

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export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
			  -prune -o
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export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
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# ===========================================================================
# Rules shared between *config targets and build targets

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# Basic helpers built in scripts/basic/
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PHONY += scripts_basic
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scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
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	$(Q)rm -f .tmp_quiet_recordmcount
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PHONY += outputmakefile
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# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
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# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
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outputmakefile:
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ifdef building_out_of_srctree
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	$(Q)ln -fsn $(srctree) source
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	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
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	$(Q)test -e .gitignore || \
	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
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endif
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ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
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ifneq ($(CROSS_COMPILE),)
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CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
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GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
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CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
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GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
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endif
ifneq ($(GCC_TOOLCHAIN),)
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CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
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endif
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ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
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CLANG_FLAGS	+= -no-integrated-as
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endif
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CLANG_FLAGS	+= -Werror=unknown-warning-option
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KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
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export CLANG_FLAGS
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endif

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# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
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CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
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ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
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include arch/$(SRCARCH)/Makefile
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export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
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config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.

ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well

ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  KBUILD_MODULES := 1
endif

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
endif

export KBUILD_MODULES KBUILD_BUILTIN

607 608 609 610
ifeq ($(dot-config),1)
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
614
drivers-y	:= drivers/ sound/
615
drivers-$(CONFIG_SAMPLES) += samples/
616
drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
620
virt-y		:= virt/
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endif # KBUILD_EXTMOD

623 624 625 626 627 628 629 630 631
# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
# Defaults to vmlinux, but the arch makefile usually adds further targets
all: vmlinux

CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
	$(call cc-option,-fno-tree-loop-im) \
	$(call cc-disable-warning,maybe-uninitialized,)
632
export CFLAGS_GCOV
633

634 635 636 637 638
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

639 640 641 642 643 644 645 646 647
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
export RETPOLINE_CFLAGS
export RETPOLINE_VDSO_CFLAGS

648 649 650 651 652 653
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
# values of the respective KBUILD_* variables
ARCH_CPPFLAGS :=
ARCH_AFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile
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655
ifeq ($(dot-config),1)
656
ifeq ($(may-sync-config),1)
657 658 659
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
660
include include/config/auto.conf.cmd
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662 663 664 665 666 667 668 669
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" not found!'
	@echo >&2 '***'
	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
	@echo >&2 '*** "make menuconfig" or "make xconfig").'
	@echo >&2 '***'
	@/bin/false
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671 672 673
# The actual configuration files used during the build are stored in
# include/generated/ and include/config/. Update them if .config is newer than
# include/config/auto.conf (which mirrors .config).
674 675 676 677
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
678
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679
else
680 681 682
# External modules and some install targets need include/generated/autoconf.h
# and include/config/auto.conf but do not care if they are up-to-date.
# Use auto.conf to trigger the test
683 684 685
PHONY += include/config/auto.conf

include/config/auto.conf:
686
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
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	echo >&2;							\
	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo >&2 ;							\
692 693
	/bin/false)

694
endif # may-sync-config
695
endif # $(dot-config)
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697
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
698
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
699 700
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
701
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
702

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
704
KBUILD_CFLAGS	+= -Os
705 706 707
else
KBUILD_CFLAGS   += -O2
endif
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709 710 711
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
712

713 714 715
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

716
include scripts/Makefile.kcov
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717 718
include scripts/Makefile.gcc-plugins

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719 720 721 722 723 724 725 726 727 728
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                 $(call cc-option,-fno-ipa-cp-clone,) \
                 $(call cc-option,-fno-partial-inlining)
endif

729
ifneq ($(CONFIG_FRAME_WARN),0)
730 731 732
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

733
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
734 735
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
736 737

KBUILD_CFLAGS += $(stackp-flags-y)
738

739
ifdef CONFIG_CC_IS_CLANG
740 741 742
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
743
# Quiet clang warning: comparison of unsigned expression < 0 is always false
744
KBUILD_CFLAGS += -Wno-tautological-compare
745 746 747
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
748
KBUILD_CFLAGS += -mno-global-merge
749 750 751 752
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
753
KBUILD_CFLAGS += -Wno-unused-but-set-variable
754 755
endif

756
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
758
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
760 761 762 763 764 765
# Some targets (ARM with Thumb2, for example), can't be built with frame
# pointers.  For those, we don't have FUNCTION_TRACER automatically
# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
# -fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER
766
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
768
endif
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770 771 772 773 774
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

775
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
776

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
779
DEBUG_CFLAGS	+= -gsplit-dwarf
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else
781
DEBUG_CFLAGS	+= -g
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endif
783
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
785
ifdef CONFIG_DEBUG_INFO_DWARF4
786
DEBUG_CFLAGS	+= -gdwarf-4
787
endif
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788

789
ifdef CONFIG_DEBUG_INFO_REDUCED
790
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
791
		   $(call cc-option,-fno-var-tracking)
792 793
endif

794 795 796
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

797
ifdef CONFIG_FUNCTION_TRACER
798 799 800 801 802 803
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
804 805 806 807 808 809
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
810
endif
811
ifdef CONFIG_HAVE_FENTRY
812 813 814 815
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
816
endif
817 818 819
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
820
ifdef CONFIG_DYNAMIC_FTRACE
821
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
822 823 824 825
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
826 827
endif

828 829 830 831 832
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

833
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
834 835
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
836 837
endif

838 839 840 841
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

842
# arch Makefile may override CC so keep this after arch Makefile is included
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NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
844

L
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845
# warn about C99 declaration after statement
846
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
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847

848
# Warn about unmarked fall-throughs in switch statement.
849
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
850

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Kees Cook 已提交
851
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
852
KBUILD_CFLAGS += -Wvla
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853

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854
# disable pointer signed / unsigned warnings in gcc 4.0
855
KBUILD_CFLAGS += -Wno-pointer-sign
L
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856

857 858 859
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

860
# disable invalid "can't wrap" optimizations for signed / pointers
861
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
862

863 864 865 866 867 868 869 870 871
# clang sets -fmerge-all-constants by default as optimization, but this
# is non-conforming behavior for C and in fact breaks the kernel, so we
# need to disable it here generally.
KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)

# for gcc -fno-merge-all-constants disables everything, but it is fine
# to have actual conforming behavior enabled.
KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)

872 873 874
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

875 876 877
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

878 879 880
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

881 882 883
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

884 885 886
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

887 888 889
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

890 891 892 893 894 895
# ensure -fcf-protection is disabled when using retpoline as it is
# incompatible with -mindirect-branch=thunk-extern
ifdef CONFIG_RETPOLINE
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif

896 897 898
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

899 900
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
901
include scripts/Makefile.ubsan
902

903 904 905 906 907
# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
# last assignments
KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
908

909 910
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
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Roland McGrath 已提交
911

912
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
914 915
endif

916 917 918
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

919 920 921
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

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Linus Torvalds 已提交
922
# Default kernel image to build when no specific target is given.
S
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923
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
924 925 926 927 928 929 930 931 932 933
# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= vmlinux

#
# INSTALL_PATH specifies where to place the updated kernel and system map
# images. Default is /boot, but you can set it to other values
export	INSTALL_PATH ?= /boot

934 935 936 937 938 939 940
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)

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941 942 943
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
S
Sam Ravnborg 已提交
944
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
945 946
#

947
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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948 949
export MODLIB

950
#
951 952 953 954
# INSTALL_MOD_STRIP, if defined, will cause modules to be
# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
# the default option --strip-debug will be used.  Otherwise,
# INSTALL_MOD_STRIP value will be used as the options to the strip command.
955

956 957
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
958
mod_strip_cmd = $(STRIP) --strip-debug
959
else
960
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
961 962
endif # INSTALL_MOD_STRIP=1
else
963
mod_strip_cmd = true
964 965 966
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

967 968 969 970 971 972 973
# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
# or CONFIG_MODULE_COMPRESS_XZ.

mod_compress_cmd = true
ifdef CONFIG_MODULE_COMPRESS
  ifdef CONFIG_MODULE_COMPRESS_GZIP
974
    mod_compress_cmd = gzip -n -f
975 976
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
977
    mod_compress_cmd = xz -f
978 979 980 981
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

982
ifdef CONFIG_MODULE_SIG_ALL
983 984 985
$(eval $(call config_filename,MODULE_SIG_KEY))

mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
986 987 988 989 990
else
mod_sign_cmd = true
endif
export mod_sign_cmd

991 992
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

993 994
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
995
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
996 997 998 999 1000 1001 1002 1003
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1004
PHONY += prepare0
1005

1006 1007
export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order

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1008
ifeq ($(KBUILD_EXTMOD),)
1009
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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1010 1011 1012

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1013
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
1014

1015 1016 1017
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
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1018

1019 1020 1021 1022
init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
L
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1023
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1024 1025
libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
L
Linus Torvalds 已提交
1026

1027
# Externally visible symbols (used by link-vmlinux.sh)
1028 1029
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1030
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1031
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1032
export LDFLAGS_vmlinux
1033
# used by scripts/package/Makefile
1034
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1035

1036
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1037

1038 1039
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1040
ifdef CONFIG_TRIM_UNUSED_KSYMS
1041
autoksyms_recursive: $(vmlinux-deps) modules.order
1042
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1043
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1044
endif
1045

1046 1047 1048 1049 1050 1051 1052
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
ifdef CONFIG_TRIM_UNUSED_KSYMS
  KBUILD_MODULES := 1
endif

1053 1054 1055 1056 1057
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1058

1059 1060 1061
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1062
cmd_link-vmlinux =                                                 \
1063
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1064
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1065

1066
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1067
	+$(call if_changed,link-vmlinux)
1068

1069 1070
targets := vmlinux

1071
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1072
# make sure no implicit rule kicks in
1073
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
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# Handle descending into subdirectories listed in $(vmlinux-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language

1081
PHONY += $(vmlinux-dirs)
1082
$(vmlinux-dirs): prepare
1083
	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
L
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1085
filechk_kernel.release = \
1086 1087
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
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# Store (new) KERNELRELEASE string in include/config/kernel.release
1089
include/config/kernel.release: FORCE
1090
	$(call filechk,kernel.release)
1091

1092 1093 1094 1095
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1096
scripts: scripts_basic scripts_dtc
1097
	$(Q)$(MAKE) $(build)=$(@)
1098

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# Things we need to do before we recursively start building the kernel
1100 1101 1102 1103
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
L
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1105
PHONY += prepare archprepare prepare3
1106

1107
# prepare3 is used to check if we are building in a separate output directory,
L
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# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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prepare3: include/config/kernel.release
1111
ifdef building_out_of_srctree
1112
	@$(kecho) '  Using $(srctree) as source for kernel'
1113 1114 1115
	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1116
		echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
M
Michal Marek 已提交
1117
		echo >&2 "  in the '$(srctree)' directory.";\
L
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1118 1119 1120 1121
		/bin/false; \
	fi;
endif

1122 1123
archprepare: archheaders archscripts scripts prepare3 outputmakefile \
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1124

1125
prepare0: archprepare
1126
	$(Q)$(MAKE) $(build)=scripts/mod
1127
	$(Q)$(MAKE) $(build)=.
1128

L
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# All the preparing..
1130 1131
prepare: prepare0 prepare-objtool

1132
# Support for using generic headers in asm-generic
1133 1134
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1135 1136
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1137 1138
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1139
uapi-asm-generic:
1140 1141
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1142

1143
PHONY += prepare-objtool
1144
prepare-objtool: $(objtool_target)
1145 1146 1147 1148 1149 1150 1151 1152
ifeq ($(SKIP_STACK_VALIDATION),1)
ifdef CONFIG_UNWINDER_ORC
	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
	@false
else
	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
endif
endif
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# Generate some files
# ---------------------------------------------------------------------------

# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds

uts_len := 64
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define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1166
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
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endef
L
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define filechk_version.h
1170
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1171
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1172
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
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endef

1175
$(version_h): FORCE
L
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	$(call filechk,version.h)
1177
	$(Q)rm -f $(old_version_h)
L
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1178

1179
include/generated/utsrelease.h: include/config/kernel.release FORCE
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	$(call filechk,utsrelease.h)

1182 1183
PHONY += headerdep
headerdep:
1184 1185
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1186

1187 1188 1189
# ---------------------------------------------------------------------------
# Kernel headers

1190 1191
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1192

1193 1194 1195 1196 1197
quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
      cmd_headers_install = \
	mkdir -p $(INSTALL_HDR_PATH); \
	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
	usr/include $(INSTALL_HDR_PATH)
1198

1199
PHONY += headers_install
1200 1201
headers_install: headers
	$(call cmd,headers_install)
1202

1203
PHONY += archheaders archscripts
1204

1205
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1206

1207 1208
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1209
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1210
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1211 1212
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1213

1214
PHONY += headers_check
1215
headers_check: headers
1216 1217
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1218

1219
ifdef CONFIG_HEADERS_INSTALL
1220
prepare: headers
1221
endif
1222

1223 1224 1225 1226
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1227 1228 1229 1230
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1231 1232 1233 1234 1235
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1236
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1237

1238
PHONY += kselftest-clean
W
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1239
kselftest-clean:
1240
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1241

1242 1243 1244
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1245 1246
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1247 1248
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
# ---------------------------------------------------------------------------
# Devicetree files

ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
dtstree := arch/$(SRCARCH)/boot/dts
endif

ifneq ($(dtstree),)

%.dtb: prepare3 scripts_dtc
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1261 1262
PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc
1263 1264
	$(Q)$(MAKE) $(build)=$(dtstree)

1265 1266 1267
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
dtbs_install:
	$(Q)$(MAKE) $(dtbinst)=$(dtstree)

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

PHONY += scripts_dtc
scripts_dtc: scripts_basic
	$(Q)$(MAKE) $(build)=scripts/dtc

1281 1282 1283
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
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1289
# By default, build modules as well
L
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1290

1291
all: modules
L
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1292

1293
# Build modules
T
Tejun Heo 已提交
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#
1295 1296 1297
# A module can be listed more than once in obj-m resulting in
# duplicate lines in modules.order files.  Those are removed
# using awk while concatenating to the final file.
L
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1299
PHONY += modules
1300
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1301
	@$(kecho) '  Building modules, stage 2.';
S
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1302
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1303
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1305 1306 1307
modules.order: $(vmlinux-dirs)
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@

1308
modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1309

1310 1311
modules.builtin: $(modbuiltin-dirs)
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1312

1313 1314 1315 1316 1317
PHONY += $(modbuiltin-dirs)
# tristate.conf is not included from this Makefile. Add it as a prerequisite
# here to make it self-healing in case somebody accidentally removes it.
$(modbuiltin-dirs): include/config/tristate.conf
	$(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
L
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1318 1319

# Target to prepare building external modules
1320
PHONY += modules_prepare
1321
modules_prepare: prepare
L
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1322 1323

# Target to install modules
1324
PHONY += modules_install
L
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1325 1326
modules_install: _modinst_ _modinst_post

1327
PHONY += _modinst_
1328
_modinst_:
L
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1329 1330 1331
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1332
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1333 1334
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1335
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
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1336
	fi
1337 1338
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1339
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1340
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1341

1342
# This depmod is only for convenience to give the initial
L
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1343 1344
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1345
PHONY += _modinst_post
1346
_modinst_post: _modinst_
1347
	$(call cmd,depmod)
L
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J
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1349 1350 1351 1352 1353 1354
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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else # CONFIG_MODULES

# Modules not configured
# ---------------------------------------------------------------------------

1360 1361
PHONY += modules modules_install
modules modules_install:
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1362 1363 1364 1365 1366
	@echo >&2
	@echo >&2 "The present kernel configuration has modules disabled."
	@echo >&2 "Type 'make config' and enable loadable module support."
	@echo >&2 "Then build a kernel with module support enabled."
	@echo >&2
L
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	@exit 1

endif # CONFIG_MODULES

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules
# make mrproper  Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
1379
CLEAN_DIRS  += include/ksym
1380
CLEAN_FILES += modules.builtin.modinfo
L
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1381 1382

# Directories & files removed with 'make mrproper'
1383
MRPROPER_DIRS  += include/config include/generated          \
1384
		  arch/$(SRCARCH)/include/generated .tmp_objdiff
1385
MRPROPER_FILES += .config .config.old .version \
1386
		  Module.symvers \
1387 1388
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1389
		  signing_key.x509.signer vmlinux-gdb.py
L
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1390

1391 1392 1393 1394
# Directories & files removed with 'make distclean'
DISTCLEAN_DIRS  +=
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
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1395 1396 1397 1398
# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1399
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
L
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1400

1401
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1402 1403 1404
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1405 1406
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1407
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1408 1409

clean: archclean vmlinuxclean
L
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1410 1411 1412 1413 1414

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1415
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1416

1417
PHONY += $(mrproper-dirs) mrproper
L
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1418 1419 1420
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1421
mrproper: clean $(mrproper-dirs)
L
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1422 1423 1424 1425 1426
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1427 1428 1429
distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1430
PHONY += distclean
L
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1431 1432

distclean: mrproper
1433 1434
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
L
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1435
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1436
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1437 1438
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1439 1440 1441 1442 1443
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1444
package-dir	:= scripts/package
L
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1445

1446 1447
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1448
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1449
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1450 1451 1452 1453 1454


# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------

1455
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1456
boards := $(sort $(notdir $(boards)))
1457 1458
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1459

1460
PHONY += help
L
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1461 1462
help:
	@echo  'Cleaning targets:'
1463
	@echo  '  clean		  - Remove most generated files but keep the config and'
1464
	@echo  '                    enough build support to build external modules'
1465
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1466
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1467 1468 1469 1470 1471 1472 1473 1474
	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all targets marked with [*]'
	@echo  '* vmlinux	  - Build the bare kernel'
	@echo  '* modules	  - Build all modules'
1475
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
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1476
	@echo  '  dir/            - Build all files in dir and below'
1477
	@echo  '  dir/file.[ois]  - Build specified target only'
1478 1479
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1480 1481
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1482
	@echo  '  dir/file.ko     - Build module including final link'
1483
	@echo  '  modules_prepare - Set up for building external modules'
L
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1484 1485
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1486
	@echo  '  gtags           - Generate GNU GLOBAL index'
1487 1488 1489
	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
	@echo  '  image_name	  - Output the image name (use with make -s)'
1490
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1491
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1492
	 echo  ''
R
Randy Dunlap 已提交
1493
	@echo  'Static analysers:'
L
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1494 1495
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1496
	@echo  '  versioncheck    - Sanity check on version.h usage'
1497
	@echo  '  includecheck    - Check for duplicate included header files'
1498
	@echo  '  export_report   - List the usages of all exported symbols'
1499
	@echo  '  headers_check   - Sanity check on exported headers'
1500
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1501
	@echo  '  coccicheck      - Check with Coccinelle'
1502
	@echo  ''
R
Randy Dunlap 已提交
1503
	@echo  'Kernel selftest:'
1504 1505 1506
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
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1507
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1508
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1509
	@echo  '                    .config.'
1510
	@echo  ''
1511 1512 1513 1514 1515 1516
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
		echo '* dtbs            - Build device tree blobs for enabled boards'; \
		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
		echo '')

R
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	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1521
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1522
	@$(MAKE) $(build)=$(package-dir) help
L
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1523 1524
	@echo  ''
	@echo  'Documentation targets:'
1525
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1526
	@echo  ''
1527
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1528
	@$(if $(archhelp),$(archhelp),\
1529
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1530 1531 1532 1533 1534
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1535 1536 1537 1538 1539
	@$(if $(board-dirs), \
		$(foreach b, $(board-dirs), \
		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
		printf "  %-16s - Show all of the above\\n" help-boards; \
		echo '')
L
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	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1542
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
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	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
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	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1545
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1546
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1547 1548 1549 1550
	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
	@echo  '		1: warnings which may be relevant and do not occur too often'
	@echo  '		2: warnings which occur quite often but may still be relevant'
	@echo  '		3: more obscure warnings, can most likely be ignored'
1551
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1557 1558 1559 1560
help-board-dirs := $(addprefix help-,$(board-dirs))

help-boards: $(help-board-dirs)

1561
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1562 1563 1564 1565 1566 1567 1568 1569 1570

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(SRCARCH) $*):'
	@$(if $(boards-per-dir), \
		$(foreach b, $(boards-per-dir), \
		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
		echo '')


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# Documentation targets
# ---------------------------------------------------------------------------
1573 1574
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1575 1576
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1577
	$(Q)$(MAKE) $(build)=Documentation $@
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1579 1580 1581 1582
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1583
scripts_gdb: prepare0
1584
	$(Q)$(MAKE) $(build)=scripts/gdb
1585
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1586 1587 1588 1589 1590

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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else # KBUILD_EXTMOD

###
# External module support.
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
# in the basis kernel ordinary make commands (without M=...) must
# be used.
#
# The following are the only valid targets when building external
# modules.
# make M=dir clean     Delete all automatically generated files
# make M=dir modules   Make all modules in specified dir
# make M=dir	       Same as 'make M=dir modules'
# make M=dir modules_install
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#                      Install the modules built in the module directory
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#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1

1613
PHONY += $(objtree)/Module.symvers
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$(objtree)/Module.symvers:
	@test -e $(objtree)/Module.symvers || ( \
	echo; \
	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
	echo "           is missing; modules will have no dependencies and modversions."; \
	echo )

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1622
PHONY += $(module-dirs) modules
1623
$(module-dirs): prepare $(objtree)/Module.symvers
1624
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
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modules: $(module-dirs)
1627
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1630
PHONY += modules_install
1631
modules_install: _emodinst_ _emodinst_post
1632

1633 1634
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1635 1636
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1639
PHONY += _emodinst_post
1640 1641 1642
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1645
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1649
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1651
PHONY += help
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help:
	@echo  '  Building external modules.'
	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
	@echo  ''
	@echo  '  modules         - default target, build the module(s)'
	@echo  '  modules_install - install the module'
	@echo  '  clean           - remove generated files in module directory only'
	@echo  ''
1660

1661
PHONY += prepare
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endif # KBUILD_EXTMOD

1664 1665 1666
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1667
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1668
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1669 1670
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1671
		-o -name '*.dwo' -o -name '*.lst' \
1672
		-o -name '*.su' -o -name '*.mod' \
1673
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1674
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1675
		-o -name '*.asn1.[ch]' \
1676 1677
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1679
		-o -name '*.ll' \
1680 1681
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1684 1685
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1687
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

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PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1696
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1698
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1701
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1703
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1705 1706 1707
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1711 1712 1713
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1714
PHONY += checkstack kernelrelease kernelversion image_name
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# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
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checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1727
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1729 1730
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1731

1732
kernelversion:
1733
	@echo $(KERNELVERSION)
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1735 1736 1737
image_name:
	@echo $(KBUILD_IMAGE)

1738
# Clear a bunch of variables before executing the submake
1739 1740 1741 1742 1743

ifeq ($(quiet),silent_)
tools_silent=s
endif

1744
tools/: FORCE
1745
	$(Q)mkdir -p $(objtree)/tools
1746
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1747 1748

tools/%: FORCE
1749
	$(Q)mkdir -p $(objtree)/tools
1750
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1751

1752 1753
# Single targets
# ---------------------------------------------------------------------------
1754
# Single targets are compatible with:
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# - build with mixed source and output
1756 1757 1758 1759 1760 1761
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
build-dir = $(patsubst %/,%,$(dir $(build-target)))

%.i: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.ll: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.lst: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.o: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.s: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.symtypes: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1777 1778 1779 1780 1781 1782 1783 1784 1785
ifeq ($(KBUILD_EXTMOD),)
# For the single build of an in-tree module, use a temporary file to avoid
# the situation of modules_install installing an invalid modules.order.
%.ko: MODORDER := .modules.tmp
endif
%.ko: prepare FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
	$(Q)echo $(build-target) > $(MODORDER)
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1786

1787
# Modules
1788 1789 1790
PHONY += /
/: ./

1791
%/: prepare FORCE
1792
	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1793

1794
# FIXME Should go into a make.lib or something
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# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)

1803
# Run depmod only if we have System.map and depmod is executable
1804
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1806
                   $(KERNELRELEASE)
1807

1808 1809
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1811
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1813 1814
endif   # ifeq ($(config-targets),1)
endif   # ifeq ($(mixed-targets),1)
1815
endif   # need-sub-make
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1817
PHONY += FORCE
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1818
FORCE:
1819

1820
# Declare the contents of the PHONY variable as phony.  We keep that
1821
# information in a variable so we can use it in if_changed and friends.
1822
.PHONY: $(PHONY)