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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)
  $(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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src		:= $(srctree)
obj		:= $(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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CLANG_FLAGS	+= -no-integrated-as
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.

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# 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

602 603 604 605
ifeq ($(dot-config),1)
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
609
drivers-y	:= drivers/ sound/
610
drivers-$(CONFIG_SAMPLES) += samples/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
614
virt-y		:= virt/
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endif # KBUILD_EXTMOD

617 618 619 620 621 622 623 624 625
# 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,)
626
export CFLAGS_GCOV
627

628 629 630 631 632
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

633 634 635 636 637 638 639 640 641
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

642 643 644 645 646 647
# 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/$(SRCARCH)/Makefile
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649
ifeq ($(dot-config),1)
650
ifeq ($(may-sync-config),1)
651 652 653
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
654
include include/config/auto.conf.cmd
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656 657 658 659 660 661 662 663
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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665 666 667
# 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).
668 669 670 671
#
# 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)
672
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
673
else
674 675 676
# 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
677 678 679
PHONY += include/config/auto.conf

include/config/auto.conf:
680
	$(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 ;							\
686 687
	/bin/false)

688
endif # may-sync-config
689
endif # $(dot-config)
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690

691
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
692
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
693 694
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
695
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
696

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697
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
698
KBUILD_CFLAGS	+= -Os
699 700 701
else
KBUILD_CFLAGS   += -O2
endif
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702

703 704 705
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
706

707 708 709
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

710
include scripts/Makefile.kcov
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Emese Revfy 已提交
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include scripts/Makefile.gcc-plugins

A
Andi Kleen 已提交
713 714 715 716 717 718 719 720 721 722
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

723
ifneq ($(CONFIG_FRAME_WARN),0)
724 725 726
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

727
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
728 729
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
730 731

KBUILD_CFLAGS += $(stackp-flags-y)
732

733
ifdef CONFIG_CC_IS_CLANG
734 735 736
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
737
# Quiet clang warning: comparison of unsigned expression < 0 is always false
738
KBUILD_CFLAGS += -Wno-tautological-compare
739 740 741
# 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
742
KBUILD_CFLAGS += -mno-global-merge
743 744 745 746
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
747
KBUILD_CFLAGS += -Wno-unused-but-set-variable
748 749
endif

750
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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751
ifdef CONFIG_FRAME_POINTER
752
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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753
else
754 755 756 757 758 759
# 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
760
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
762
endif
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764 765 766 767 768
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

769
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
770

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771
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
772
ifdef CONFIG_DEBUG_INFO_SPLIT
773
DEBUG_CFLAGS	+= -gsplit-dwarf
A
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774
else
775
DEBUG_CFLAGS	+= -g
A
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776
endif
777
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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778
endif
779
ifdef CONFIG_DEBUG_INFO_DWARF4
780
DEBUG_CFLAGS	+= -gdwarf-4
781
endif
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782

783
ifdef CONFIG_DEBUG_INFO_REDUCED
784
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
785
		   $(call cc-option,-fno-var-tracking)
786 787
endif

788 789 790
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

791
ifdef CONFIG_FUNCTION_TRACER
792 793 794 795 796 797
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
798 799 800 801 802 803
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
804
endif
805
ifdef CONFIG_HAVE_FENTRY
806 807 808 809
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
810
endif
811 812 813
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
814
ifdef CONFIG_DYNAMIC_FTRACE
815
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
816 817 818 819
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
820 821
endif

822 823 824 825 826
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

827
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
828 829
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
830 831
endif

832 833 834 835
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

836
# arch Makefile may override CC so keep this after arch Makefile is included
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Masahiro Yamada 已提交
837
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
838

L
Linus Torvalds 已提交
839
# warn about C99 declaration after statement
840
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
841

K
Kees Cook 已提交
842
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
843
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
844

S
Sam Ravnborg 已提交
845
# disable pointer signed / unsigned warnings in gcc 4.0
846
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
847

848 849 850
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

851
# disable invalid "can't wrap" optimizations for signed / pointers
852
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
853

854 855 856 857 858 859 860 861 862
# 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)

863 864 865
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

866 867 868
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

869 870 871
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

872 873 874
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

875 876 877
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

878 879 880
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

881 882 883
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

884 885
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
886
include scripts/Makefile.ubsan
887

888 889 890 891 892
# 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)
893

R
Roland McGrath 已提交
894
# Use --build-id when available.
895
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
896
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
897 898
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

899
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
900
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
901 902
endif

903 904 905
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

906 907 908
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
909
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
910
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
911 912 913 914 915 916 917 918 919 920
# 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

921 922 923 924 925 926 927
#
# 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)

L
Linus Torvalds 已提交
928 929 930
#
# 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
931
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
932 933
#

934
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
935 936
export MODLIB

937
#
938 939 940 941
# 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.
942

943 944
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
945
mod_strip_cmd = $(STRIP) --strip-debug
946
else
947
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
948 949
endif # INSTALL_MOD_STRIP=1
else
950
mod_strip_cmd = true
951 952 953
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

954 955 956 957 958 959 960
# 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
961
    mod_compress_cmd = gzip -n -f
962 963
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
964
    mod_compress_cmd = xz -f
965 966 967 968
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

969
ifdef CONFIG_MODULE_SIG_ALL
970 971 972
$(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
973 974 975 976 977
else
mod_sign_cmd = true
endif
export mod_sign_cmd

978 979
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

980 981
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
982
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
983 984 985 986 987 988 989 990
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

991
PHONY += prepare0
992

L
Linus Torvalds 已提交
993
ifeq ($(KBUILD_EXTMOD),)
994
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
995 996 997

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
998
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
999

1000 1001 1002
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
1003

1004 1005 1006 1007
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
1008
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1009 1010
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
1011

1012
# Externally visible symbols (used by link-vmlinux.sh)
1013 1014
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1015
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1016
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1017
export LDFLAGS_vmlinux
1018
# used by scripts/package/Makefile
1019
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1020

1021
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1022

1023 1024 1025
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
1026
ifdef CONFIG_TRIM_UNUSED_KSYMS
1027
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1028
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1029
endif
1030

1031 1032 1033 1034 1035 1036 1037
# 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

1038 1039 1040 1041 1042
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1043

1044 1045 1046
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1047
cmd_link-vmlinux =                                                 \
1048
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1049
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1050

1051
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1052
	+$(call if_changed,link-vmlinux)
1053

1054 1055
targets := vmlinux

1056
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1057
# make sure no implicit rule kicks in
1058
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
Linus Torvalds 已提交
1059 1060 1061 1062 1063 1064 1065

# 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

1066
PHONY += $(vmlinux-dirs)
1067
$(vmlinux-dirs): prepare
1068
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
Linus Torvalds 已提交
1069

1070
filechk_kernel.release = \
1071 1072
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1073
# Store (new) KERNELRELEASE string in include/config/kernel.release
1074
include/config/kernel.release: FORCE
1075
	$(call filechk,kernel.release)
1076

1077 1078 1079 1080
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1081
scripts: scripts_basic scripts_dtc
1082
	$(Q)$(MAKE) $(build)=$(@)
1083

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# Things we need to do before we recursively start building the kernel
1085 1086 1087 1088
# 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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1090
PHONY += prepare archprepare prepare1 prepare3
1091

1092
# prepare3 is used to check if we are building in a separate output directory,
L
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1093 1094
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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1095
prepare3: include/config/kernel.release
1096
ifneq ($(srctree),.)
1097
	@$(kecho) '  Using $(srctree) as source for kernel'
1098 1099 1100
	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
M
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1101 1102
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
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1103 1104 1105 1106
		/bin/false; \
	fi;
endif

1107 1108
prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
						include/generated/utsrelease.h
S
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1109
	$(cmd_crmodverdir)
L
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1110

1111
archprepare: archheaders archscripts prepare1 scripts
1112

1113
prepare0: archprepare
1114
	$(Q)$(MAKE) $(build)=scripts/mod
1115
	$(Q)$(MAKE) $(build)=.
1116

L
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1117
# All the preparing..
1118 1119
prepare: prepare0 prepare-objtool

1120
# Support for using generic headers in asm-generic
1121 1122
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1123 1124
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1125 1126
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1127
uapi-asm-generic:
1128 1129
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1130

1131
PHONY += prepare-objtool
1132
prepare-objtool: $(objtool_target)
1133 1134 1135 1136 1137 1138 1139 1140
ifeq ($(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 $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1154
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
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1155
endef
L
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define filechk_version.h
1158
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
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1159
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1160
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
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1161 1162
endef

1163
$(version_h): FORCE
L
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1164
	$(call filechk,version.h)
1165
	$(Q)rm -f $(old_version_h)
L
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1166

1167
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1168 1169
	$(call filechk,utsrelease.h)

1170 1171
PHONY += headerdep
headerdep:
1172 1173
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1174

1175 1176 1177
# ---------------------------------------------------------------------------
# Kernel headers

1178 1179
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1180

1181 1182 1183 1184 1185
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)
1186

1187
PHONY += headers_install
1188 1189 1190 1191 1192
headers_install: headers
	$(call cmd,headers_install)

PHONY += archheaders archscripts

1193 1194
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj

1195 1196
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1197
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1198
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1199 1200
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1201

1202
PHONY += headers_check
1203
headers_check: headers
1204 1205
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1206

1207
ifdef CONFIG_HEADERS_INSTALL
1208
prepare: headers
1209 1210
endif

1211 1212 1213 1214
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1215 1216 1217 1218
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1219 1220 1221 1222 1223
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1224
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1225

1226
PHONY += kselftest-clean
W
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1227
kselftest-clean:
1228
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1229

1230 1231 1232
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1233 1234
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1235 1236
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
# ---------------------------------------------------------------------------
# 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) $(dtstree)/$@

1249 1250
PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc
1251 1252
	$(Q)$(MAKE) $(build)=$(dtstree)

1253 1254 1255
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
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

1269 1270 1271
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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1272 1273 1274 1275 1276
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
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1277
# By default, build modules as well
L
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1278

1279
all: modules
L
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1280

1281
# Build modules
T
Tejun Heo 已提交
1282
#
1283 1284 1285
# 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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1286

1287
PHONY += modules
1288
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
Tejun Heo 已提交
1289
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1290
	@$(kecho) '  Building modules, stage 2.';
S
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1291
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1292
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1293

1294 1295 1296
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1297
%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1298 1299
	$(Q)$(MAKE) $(modbuiltin)=$*

L
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1300 1301

# Target to prepare building external modules
1302
PHONY += modules_prepare
1303
modules_prepare: prepare
L
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1304 1305

# Target to install modules
1306
PHONY += modules_install
L
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1307 1308
modules_install: _modinst_ _modinst_post

1309
PHONY += _modinst_
1310
_modinst_:
L
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1311 1312 1313
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1314
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1315 1316
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1317
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
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1318
	fi
T
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1319
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1320
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1321
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1322
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1323

1324
# This depmod is only for convenience to give the initial
L
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1325 1326
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1327
PHONY += _modinst_post
1328
_modinst_post: _modinst_
1329
	$(call cmd,depmod)
L
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1330

J
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1331 1332 1333 1334 1335 1336
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
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1337 1338 1339 1340 1341
else # CONFIG_MODULES

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

1342 1343
PHONY += modules modules_install
modules modules_install:
M
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1344 1345 1346 1347 1348
	@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'
1361
CLEAN_DIRS  += $(MODVERDIR) include/ksym
1362
CLEAN_FILES += modules.builtin.modinfo
L
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1363 1364

# Directories & files removed with 'make mrproper'
S
Sam Ravnborg 已提交
1365
MRPROPER_DIRS  += include/config usr/include include/generated          \
1366
		  arch/$(SRCARCH)/include/generated .tmp_objdiff
1367
MRPROPER_FILES += .config .config.old .version \
1368
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1369 1370
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1371
		  signing_key.x509.signer vmlinux-gdb.py
L
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1372 1373 1374 1375 1376

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1377
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
L
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1378

1379
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1380 1381 1382
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1383 1384
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1385
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1386 1387

clean: archclean vmlinuxclean
L
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1388 1389 1390 1391 1392

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1393
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1394

1395
PHONY += $(mrproper-dirs) mrproper
L
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1396 1397 1398
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1399
mrproper: clean $(mrproper-dirs)
L
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1400 1401 1402 1403 1404
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1405
PHONY += distclean
L
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1406 1407 1408

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1409
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1410 1411
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1412 1413 1414 1415 1416
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1417
package-dir	:= scripts/package
L
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1418

1419 1420
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1421
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1422
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1423 1424 1425 1426 1427


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

1428
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1429
boards := $(sort $(notdir $(boards)))
1430 1431
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1432

1433
PHONY += help
L
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1434 1435
help:
	@echo  'Cleaning targets:'
1436
	@echo  '  clean		  - Remove most generated files but keep the config and'
1437
	@echo  '                    enough build support to build external modules'
1438
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1439
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1440 1441 1442 1443 1444 1445 1446 1447
	@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'
1448
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
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1449
	@echo  '  dir/            - Build all files in dir and below'
1450
	@echo  '  dir/file.[ois]  - Build specified target only'
1451 1452
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1453 1454
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1455
	@echo  '  dir/file.ko     - Build module including final link'
1456
	@echo  '  modules_prepare - Set up for building external modules'
L
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1457 1458
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1459
	@echo  '  gtags           - Generate GNU GLOBAL index'
1460 1461 1462
	@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)'
1463
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1464
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1465
	 echo  ''
R
Randy Dunlap 已提交
1466
	@echo  'Static analysers:'
L
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1467 1468
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1469
	@echo  '  versioncheck    - Sanity check on version.h usage'
1470
	@echo  '  includecheck    - Check for duplicate included header files'
1471
	@echo  '  export_report   - List the usages of all exported symbols'
1472
	@echo  '  headers_check   - Sanity check on exported headers'
1473
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1474
	@echo  '  coccicheck      - Check with Coccinelle'
1475
	@echo  ''
R
Randy Dunlap 已提交
1476
	@echo  'Kernel selftest:'
1477 1478 1479
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
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1480
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1481
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1482
	@echo  '                    .config.'
1483
	@echo  ''
1484 1485 1486 1487 1488 1489
	@$(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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1490 1491 1492 1493
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1494
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1495
	@$(MAKE) $(build)=$(package-dir) help
L
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1496 1497
	@echo  ''
	@echo  'Documentation targets:'
1498
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1499
	@echo  ''
1500
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1501
	@$(if $(archhelp),$(archhelp),\
1502
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1503 1504 1505 1506 1507
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1508 1509 1510 1511 1512
	@$(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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1513 1514

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1515
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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1516
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1517
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1518
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1519
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1520 1521 1522 1523
	@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'
1524
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
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1525 1526 1527 1528 1529
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1530 1531 1532 1533
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1534
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1535 1536 1537 1538 1539 1540 1541 1542 1543

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1546 1547
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1548 1549
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1550
	$(Q)$(MAKE) $(build)=Documentation $@
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1551

1552 1553 1554 1555
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1556
scripts_gdb: prepare0
1557
	$(Q)$(MAKE) $(build)=scripts/gdb
1558
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1559 1560 1561 1562 1563

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

1586
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))
1595
PHONY += $(module-dirs) modules
1596
$(module-dirs): prepare $(objtree)/Module.symvers
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	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1600
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1603
PHONY += modules_install
1604
modules_install: _emodinst_ _emodinst_post
1605

1606 1607
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1608 1609
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1612
PHONY += _emodinst_post
1613 1614 1615
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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

1618
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1623
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1625
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  ''
1634

1635
PHONY += prepare
1636 1637
prepare:
	$(cmd_crmodverdir)
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endif # KBUILD_EXTMOD

1640 1641 1642
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1643
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1644
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1645 1646
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1647
		-o -name '*.dwo' -o -name '*.lst' \
1648
		-o -name '*.su'  \
1649
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1650
		-o -name '*.hdrtest.c' \
1651
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1652
		-o -name '*.asn1.[ch]' \
1653 1654
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1656
		-o -name '*.ll' \
1657 1658
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1661 1662
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1664
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:
1673
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1675
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1678
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1680
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1681

1682 1683 1684
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1688 1689 1690
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1691
PHONY += checkstack kernelrelease kernelversion image_name
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1693 1694 1695 1696 1697 1698 1699 1700 1701
# 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 $$(find . -name '*.ko') | \
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	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1706 1707
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1708

1709
kernelversion:
1710
	@echo $(KERNELVERSION)
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1712 1713 1714
image_name:
	@echo $(KBUILD_IMAGE)

1715
# Clear a bunch of variables before executing the submake
1716 1717 1718 1719 1720

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

1721
tools/: FORCE
1722
	$(Q)mkdir -p $(objtree)/tools
1723
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1724 1725

tools/%: FORCE
1726
	$(Q)mkdir -p $(objtree)/tools
1727
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1728

1729 1730
# Single targets
# ---------------------------------------------------------------------------
1731
# 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
1733 1734 1735 1736 1737 1738
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
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
1756

1757
# Modules
1758 1759 1760
PHONY += /
/: ./

1761
%/: prepare FORCE
1762
	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1763

1764
# 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)

1773
# Run depmod only if we have System.map and depmod is executable
1774
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1776
                   $(KERNELRELEASE)
1777

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1778
# Create temporary dir for module support files
1779 1780 1781
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
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1782

1783 1784
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1785

1786
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1787

1788 1789
endif   # ifeq ($(config-targets),1)
endif   # ifeq ($(mixed-targets),1)
1790
endif   # need-sub-make
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1791

1792
PHONY += FORCE
L
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1793
FORCE:
1794

1795
# Declare the contents of the PHONY variable as phony.  We keep that
1796
# information in a variable so we can use it in if_changed and friends.
1797
.PHONY: $(PHONY)