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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 2
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SUBLEVEL = 0
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EXTRAVERSION = -rc4
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NAME = Golden Lions
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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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ifeq ($(abs_srctree),$(abs_objtree))
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        # building in the source tree
        srctree := .
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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	# TODO:
	# KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
	# Replace it with $(srctree) or something.
	KBUILD_SRC := $(abs_srctree)
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endif
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export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

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objtree		:= .
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VPATH		:= $(srctree)
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export 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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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 $(filter .,$(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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export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
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export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
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export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
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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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# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

# 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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	$(Q)rm -f .tmp_quiet_recordmcount
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PHONY += outputmakefile
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# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
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# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
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outputmakefile:
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ifneq ($(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.

571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608
# 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

609 610 611 612
ifeq ($(dot-config),1)
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
616
drivers-y	:= drivers/ sound/
617
drivers-$(CONFIG_SAMPLES) += samples/
618
drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
622
virt-y		:= virt/
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endif # KBUILD_EXTMOD

625 626 627 628 629 630 631 632 633
# 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,)
634
export CFLAGS_GCOV
635

636 637 638 639 640
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

641 642 643 644 645 646 647 648 649
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

650 651 652 653 654 655
# 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/$(SRCARCH)/Makefile
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657
ifeq ($(dot-config),1)
658
ifeq ($(may-sync-config),1)
659 660 661
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
662
include include/config/auto.conf.cmd
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664 665 666 667 668 669 670 671
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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673 674 675
# 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).
676 677 678 679
#
# 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)
680
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
681
else
682 683 684
# 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
685 686 687
PHONY += include/config/auto.conf

include/config/auto.conf:
688
	$(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 ;							\
694 695
	/bin/false)

696
endif # may-sync-config
697
endif # $(dot-config)
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699
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
700
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
701 702
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
703
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
704

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
706
KBUILD_CFLAGS	+= -Os
707 708 709
else
KBUILD_CFLAGS   += -O2
endif
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711 712 713
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
714

715 716 717
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

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

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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

731
ifneq ($(CONFIG_FRAME_WARN),0)
732 733 734
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

735
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
736 737
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
738 739

KBUILD_CFLAGS += $(stackp-flags-y)
740

741
ifdef CONFIG_CC_IS_CLANG
742 743 744
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
745
# Quiet clang warning: comparison of unsigned expression < 0 is always false
746
KBUILD_CFLAGS += -Wno-tautological-compare
747 748 749
# 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
750
KBUILD_CFLAGS += -mno-global-merge
751 752 753 754
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
755
KBUILD_CFLAGS += -Wno-unused-but-set-variable
756 757
endif

758
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
760
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
762 763 764 765 766 767
# 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
768
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
770
endif
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772 773 774 775 776
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

777
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
778

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
781
DEBUG_CFLAGS	+= -gsplit-dwarf
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else
783
DEBUG_CFLAGS	+= -g
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endif
785
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
787
ifdef CONFIG_DEBUG_INFO_DWARF4
788
DEBUG_CFLAGS	+= -gdwarf-4
789
endif
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791
ifdef CONFIG_DEBUG_INFO_REDUCED
792
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
793
		   $(call cc-option,-fno-var-tracking)
794 795
endif

796 797 798
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

799
ifdef CONFIG_FUNCTION_TRACER
800 801 802 803 804 805
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
806 807 808 809 810 811
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
812
endif
813
ifdef CONFIG_HAVE_FENTRY
814 815 816 817
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
818
endif
819 820 821
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
822
ifdef CONFIG_DYNAMIC_FTRACE
823
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
824 825 826 827
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
828 829
endif

830 831 832 833 834
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

835
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
836 837
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
838 839
endif

840 841 842 843
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

844
# 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)
846

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847
# warn about C99 declaration after statement
848
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
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K
Kees Cook 已提交
850
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
851
KBUILD_CFLAGS += -Wvla
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853
# disable pointer signed / unsigned warnings in gcc 4.0
854
KBUILD_CFLAGS += -Wno-pointer-sign
L
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855

856 857 858
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

859
# disable invalid "can't wrap" optimizations for signed / pointers
860
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
861

862 863 864 865 866 867 868 869 870
# 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)

871 872 873
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

874 875 876
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

877 878 879
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

880 881 882
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

883 884 885
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

886 887 888
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

889 890 891
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

892 893
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
894
include scripts/Makefile.ubsan
895

896 897 898 899 900
# 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)
901

R
Roland McGrath 已提交
902
# Use --build-id when available.
903
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
904
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
905 906
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

907
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
908
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
909 910
endif

911 912 913
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

914 915 916
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

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Linus Torvalds 已提交
917
# Default kernel image to build when no specific target is given.
S
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918
# KBUILD_IMAGE may be overruled on the command line or
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Linus Torvalds 已提交
919 920 921 922 923 924 925 926 927 928
# 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

929 930 931 932 933 934 935
#
# 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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#
# 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
939
# makefile but the argument can be passed to make if needed.
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940 941
#

942
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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943 944
export MODLIB

945
#
946 947 948 949
# 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.
950

951 952
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
953
mod_strip_cmd = $(STRIP) --strip-debug
954
else
955
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
956 957
endif # INSTALL_MOD_STRIP=1
else
958
mod_strip_cmd = true
959 960 961
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

962 963 964 965 966 967 968
# 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
969
    mod_compress_cmd = gzip -n -f
970 971
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
972
    mod_compress_cmd = xz -f
973 974 975 976
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

977
ifdef CONFIG_MODULE_SIG_ALL
978 979 980
$(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
981 982 983 984 985
else
mod_sign_cmd = true
endif
export mod_sign_cmd

986 987
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

988 989
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
990
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
991 992 993 994 995 996 997 998
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

999
PHONY += prepare0
1000

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Linus Torvalds 已提交
1001
ifeq ($(KBUILD_EXTMOD),)
1002
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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1003 1004 1005

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1006
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
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1007

1008 1009 1010
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
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1011

1012 1013 1014 1015
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
Linus Torvalds 已提交
1016
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1017 1018
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
1019

1020
# Externally visible symbols (used by link-vmlinux.sh)
1021 1022
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1023
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1024
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1025
export LDFLAGS_vmlinux
1026
# used by scripts/package/Makefile
1027
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1028

1029
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1030

1031 1032 1033
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
1034
ifdef CONFIG_TRIM_UNUSED_KSYMS
1035
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1036
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1037
endif
1038

1039 1040 1041 1042 1043 1044 1045
# 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

1046 1047 1048 1049 1050
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1051

1052 1053 1054
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1055
cmd_link-vmlinux =                                                 \
1056
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1057
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1058

1059
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1060
	+$(call if_changed,link-vmlinux)
1061

1062 1063
targets := vmlinux

1064
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1065
# make sure no implicit rule kicks in
1066
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
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1067 1068 1069 1070 1071 1072 1073

# 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

1074
PHONY += $(vmlinux-dirs)
1075
$(vmlinux-dirs): prepare
1076
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
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1078
filechk_kernel.release = \
1079 1080
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1081
# Store (new) KERNELRELEASE string in include/config/kernel.release
1082
include/config/kernel.release: FORCE
1083
	$(call filechk,kernel.release)
1084

1085 1086 1087 1088
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1089
scripts: scripts_basic scripts_dtc
1090
	$(Q)$(MAKE) $(build)=$(@)
1091

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# Things we need to do before we recursively start building the kernel
1093 1094 1095 1096
# 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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1098
PHONY += prepare archprepare prepare1 prepare3
1099

1100
# 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 $(srctree)
R
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1103
prepare3: include/config/kernel.release
1104
ifneq ($(srctree),.)
1105
	@$(kecho) '  Using $(srctree) as source for kernel'
1106 1107 1108
	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
M
Michal Marek 已提交
1109 1110
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
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		/bin/false; \
	fi;
endif

1115 1116
prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
						include/generated/utsrelease.h
S
Sam Ravnborg 已提交
1117
	$(cmd_crmodverdir)
L
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1118

1119
archprepare: archheaders archscripts prepare1 scripts
1120

1121
prepare0: archprepare
1122
	$(Q)$(MAKE) $(build)=scripts/mod
1123
	$(Q)$(MAKE) $(build)=.
1124

L
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1125
# All the preparing..
1126 1127
prepare: prepare0 prepare-objtool

1128
# Support for using generic headers in asm-generic
1129 1130
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1131 1132
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1133 1134
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1135
uapi-asm-generic:
1136 1137
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1138

1139
PHONY += prepare-objtool
1140
prepare-objtool: $(objtool_target)
1141 1142 1143 1144 1145 1146 1147 1148
ifeq ($(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 $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1162
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
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endef
L
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define filechk_version.h
1166
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
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1167
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1168
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
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endef

1171
$(version_h): FORCE
L
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1172
	$(call filechk,version.h)
1173
	$(Q)rm -f $(old_version_h)
L
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1174

1175
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1176 1177
	$(call filechk,utsrelease.h)

1178 1179
PHONY += headerdep
headerdep:
1180 1181
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1182

1183 1184 1185
# ---------------------------------------------------------------------------
# Kernel headers

1186 1187
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1188

1189 1190 1191 1192 1193
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)
1194

1195
PHONY += headers_install
1196 1197 1198 1199 1200
headers_install: headers
	$(call cmd,headers_install)

PHONY += archheaders archscripts

1201 1202
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj

1203 1204
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1205
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1206
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1207 1208
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1209

1210
PHONY += headers_check
1211
headers_check: headers
1212 1213
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1214

1215
ifdef CONFIG_HEADERS_INSTALL
1216
prepare: headers
1217 1218
endif

1219 1220 1221 1222
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1223 1224 1225 1226
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1227 1228 1229 1230 1231
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1232
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1233

1234
PHONY += kselftest-clean
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1235
kselftest-clean:
1236
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1237

1238 1239 1240
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1241 1242
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1243 1244
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
# ---------------------------------------------------------------------------
# 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) $(dtstree)/$@

1257 1258
PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc
1259 1260
	$(Q)$(MAKE) $(build)=$(dtstree)

1261 1262 1263
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
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

1277 1278 1279
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
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# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
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# By default, build modules as well
L
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1286

1287
all: modules
L
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1288

1289
# Build modules
T
Tejun Heo 已提交
1290
#
1291 1292 1293
# 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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1294

1295
PHONY += modules
1296
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1297
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1298
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1299
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1301 1302 1303
modules.order: $(vmlinux-dirs)
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@

1304
modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1305

1306 1307
modules.builtin: $(modbuiltin-dirs)
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1308

1309 1310 1311 1312 1313
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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1314 1315

# Target to prepare building external modules
1316
PHONY += modules_prepare
1317
modules_prepare: prepare
L
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1318 1319

# Target to install modules
1320
PHONY += modules_install
L
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1321 1322
modules_install: _modinst_ _modinst_post

1323
PHONY += _modinst_
1324
_modinst_:
L
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1325 1326 1327
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1328
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1329 1330
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1331
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1332
	fi
T
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1333
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1334
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1335
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1336
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1337

1338
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1339 1340
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1341
PHONY += _modinst_post
1342
_modinst_post: _modinst_
1343
	$(call cmd,depmod)
L
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1344

J
Josh Boyer 已提交
1345 1346 1347 1348 1349 1350
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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1351 1352 1353 1354 1355
else # CONFIG_MODULES

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

1356 1357
PHONY += modules modules_install
modules modules_install:
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1358 1359 1360 1361 1362
	@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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1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
	@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'
1375
CLEAN_DIRS  += $(MODVERDIR) include/ksym
1376
CLEAN_FILES += modules.builtin.modinfo
L
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1377 1378

# Directories & files removed with 'make mrproper'
1379
MRPROPER_DIRS  += include/config include/generated          \
1380
		  arch/$(SRCARCH)/include/generated .tmp_objdiff
1381
MRPROPER_FILES += .config .config.old .version \
1382
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1383 1384
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1385
		  signing_key.x509.signer vmlinux-gdb.py
L
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1386 1387 1388 1389 1390

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1391
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
L
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1392

1393
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1394 1395 1396
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1397 1398
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1399
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1400 1401

clean: archclean vmlinuxclean
L
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1402 1403 1404 1405 1406

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1407
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1408

1409
PHONY += $(mrproper-dirs) mrproper
L
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1410 1411 1412
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1413
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1414 1415 1416 1417 1418
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1419
PHONY += distclean
L
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1420 1421 1422

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1423
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1424 1425
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1426 1427 1428 1429 1430
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1431
package-dir	:= scripts/package
L
Linus Torvalds 已提交
1432

1433 1434
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1435
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1436
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1437 1438 1439 1440 1441


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

1442
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1443
boards := $(sort $(notdir $(boards)))
1444 1445
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1446

1447
PHONY += help
L
Linus Torvalds 已提交
1448 1449
help:
	@echo  'Cleaning targets:'
1450
	@echo  '  clean		  - Remove most generated files but keep the config and'
1451
	@echo  '                    enough build support to build external modules'
1452
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1453
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1454 1455 1456 1457 1458 1459 1460 1461
	@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'
1462
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1463
	@echo  '  dir/            - Build all files in dir and below'
1464
	@echo  '  dir/file.[ois]  - Build specified target only'
1465 1466
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1467 1468
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1469
	@echo  '  dir/file.ko     - Build module including final link'
1470
	@echo  '  modules_prepare - Set up for building external modules'
L
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1471 1472
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1473
	@echo  '  gtags           - Generate GNU GLOBAL index'
1474 1475 1476
	@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)'
1477
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1478
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1479
	 echo  ''
R
Randy Dunlap 已提交
1480
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1481 1482
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1483
	@echo  '  versioncheck    - Sanity check on version.h usage'
1484
	@echo  '  includecheck    - Check for duplicate included header files'
1485
	@echo  '  export_report   - List the usages of all exported symbols'
1486
	@echo  '  headers_check   - Sanity check on exported headers'
1487
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1488
	@echo  '  coccicheck      - Check with Coccinelle'
1489
	@echo  ''
R
Randy Dunlap 已提交
1490
	@echo  'Kernel selftest:'
1491 1492 1493
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1494
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1495
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1496
	@echo  '                    .config.'
1497
	@echo  ''
1498 1499 1500 1501 1502 1503
	@$(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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1504 1505 1506 1507
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1508
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1509
	@$(MAKE) $(build)=$(package-dir) help
L
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1510 1511
	@echo  ''
	@echo  'Documentation targets:'
1512
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1513
	@echo  ''
1514
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1515
	@$(if $(archhelp),$(archhelp),\
1516
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1517 1518 1519 1520 1521
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1522 1523 1524 1525 1526
	@$(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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1527 1528

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1529
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1530
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1531
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1532
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1533
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1534 1535 1536 1537
	@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'
1538
	@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'


1544 1545 1546 1547
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1548
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1549 1550 1551 1552 1553 1554 1555 1556 1557

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1560 1561
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1562 1563
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1564
	$(Q)$(MAKE) $(build)=Documentation $@
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1565

1566 1567 1568 1569
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1570
scripts_gdb: prepare0
1571
	$(Q)$(MAKE) $(build)=scripts/gdb
1572
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1573 1574 1575 1576 1577

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

1600
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))
1609
PHONY += $(module-dirs) modules
1610
$(module-dirs): prepare $(objtree)/Module.symvers
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	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1614
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1616

1617
PHONY += modules_install
1618
modules_install: _emodinst_ _emodinst_post
1619

1620 1621
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1622 1623
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1626
PHONY += _emodinst_post
1627 1628 1629
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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

1632
PHONY += $(clean-dirs) clean
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1633 1634 1635 1636
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1637
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1639
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  ''
1648

1649
PHONY += prepare
1650 1651
prepare:
	$(cmd_crmodverdir)
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endif # KBUILD_EXTMOD

1654 1655 1656
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1657
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1658
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1659 1660
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1661
		-o -name '*.dwo' -o -name '*.lst' \
1662
		-o -name '*.su'  \
1663
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1664
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1665
		-o -name '*.asn1.[ch]' \
1666 1667
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1669
		-o -name '*.ll' \
1670 1671
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1674 1675
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1677
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

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

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1683 1684
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1686
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1688
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1691
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1693
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1694

1695 1696 1697
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1701 1702 1703
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1704
PHONY += checkstack kernelrelease kernelversion image_name
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1706 1707 1708 1709 1710 1711 1712 1713 1714
# 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 $$(find . -name '*.ko') | \
1717
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1719 1720
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1721

1722
kernelversion:
1723
	@echo $(KERNELVERSION)
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1725 1726 1727
image_name:
	@echo $(KBUILD_IMAGE)

1728
# Clear a bunch of variables before executing the submake
1729 1730 1731 1732 1733

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

1734
tools/: FORCE
1735
	$(Q)mkdir -p $(objtree)/tools
1736
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1737 1738

tools/%: FORCE
1739
	$(Q)mkdir -p $(objtree)/tools
1740
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1741

1742 1743
# Single targets
# ---------------------------------------------------------------------------
1744
# Single targets are compatible with:
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Robert P. J. Day 已提交
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# - build with mixed source and output
1746 1747 1748 1749 1750 1751
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
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)
%.ko: %.o
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1769

1770
# Modules
1771 1772 1773
PHONY += /
/: ./

1774
%/: prepare FORCE
1775
	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1776

1777
# 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)

1786
# Run depmod only if we have System.map and depmod is executable
1787
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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1788
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1789
                   $(KERNELRELEASE)
1790

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1791
# Create temporary dir for module support files
1792 1793 1794
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
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1795

1796 1797
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1798

1799
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1801 1802
endif   # ifeq ($(config-targets),1)
endif   # ifeq ($(mixed-targets),1)
1803
endif   # need-sub-make
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1804

1805
PHONY += FORCE
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1806
FORCE:
1807

1808
# Declare the contents of the PHONY variable as phony.  We keep that
1809
# information in a variable so we can use it in if_changed and friends.
1810
.PHONY: $(PHONY)