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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 1
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SUBLEVEL = 0
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EXTRAVERSION = -rc3
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NAME = Shy Crocodile
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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 supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
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#
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# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

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# KBUILD_SRC is not intended to be used by the regular user (for now),
# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
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# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
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ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
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endif

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ifneq ($(words $(subst :, ,$(CURDIR))), 1)
  $(error main directory cannot contain spaces nor colons)
endif

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ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
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KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
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								&& pwd)
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$(if $(KBUILD_OUTPUT),, \
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     $(error failed to create output directory "$(saved-output)"))
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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
# once after the Makefile is read.  It is OK since we are going to invoke
# 'sub-make' below.
MAKEFLAGS += --include-dir=$(CURDIR)

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need-sub-make := 1
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else

# Do not print "Entering directory ..." at all for in-tree build.
MAKEFLAGS += --no-print-directory

endif # ifneq ($(KBUILD_OUTPUT),)

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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 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 $(CURDIR)/Makefile, $(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) \
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	$(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
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	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(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 ($(KBUILD_SRC),)
        # building in the source tree
        srctree := .
else
        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
                # building in a subdirectory of the source tree
                srctree := ..
        else
                srctree := $(KBUILD_SRC)
        endif
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 \
			 $(version_h) 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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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 $(KBUILD_SRC), -I$(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 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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	$(Q)rm -f .tmp_quiet_recordmcount
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PHONY += outputmakefile
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# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
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# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
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outputmakefile:
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ifneq ($(KBUILD_SRC),)
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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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RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
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RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
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RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
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RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
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RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
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RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
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export RETPOLINE_CFLAGS
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export RETPOLINE_VDSO_CFLAGS
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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.
CC_VERSION_TEXT = $(shell $(CC) --version | 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.

559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
# 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

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
600
drivers-y	:= drivers/ sound/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
604
virt-y		:= virt/
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endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
608
include include/config/auto.conf
609 610 611 612 613 614 615 616 617 618 619
endif

# 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,)
620
export CFLAGS_GCOV
621

622 623 624 625 626
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

627 628 629 630 631 632
# 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/$(SRCARCH)/Makefile
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634
ifeq ($(dot-config),1)
635
ifeq ($(may-sync-config),1)
636 637 638
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
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-include include/config/auto.conf.cmd
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641 642 643 644 645 646 647 648
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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650 651 652
# 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).
653 654 655 656
#
# 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)
657
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
658
else
659 660 661
# 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
662 663 664
PHONY += include/config/auto.conf

include/config/auto.conf:
665
	$(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 ;							\
671 672
	/bin/false)

673
endif # may-sync-config
674
endif # $(dot-config)
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676
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
677
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
678 679 680
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
681

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
683
KBUILD_CFLAGS	+= -Os
684 685 686
else
KBUILD_CFLAGS   += -O2
endif
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688 689 690
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
691

692 693 694
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

695
include scripts/Makefile.kcov
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include scripts/Makefile.gcc-plugins

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Andi Kleen 已提交
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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

708
ifneq ($(CONFIG_FRAME_WARN),0)
709 710 711
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

712
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
713 714
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
715 716

KBUILD_CFLAGS += $(stackp-flags-y)
717

718
ifdef CONFIG_CC_IS_CLANG
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
# 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
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
734
KBUILD_CFLAGS += -Wno-unused-but-set-variable
735 736
endif

737
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
739
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
741 742 743 744 745 746
# 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
747
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
749
endif
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751
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
752

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
755
DEBUG_CFLAGS	+= -gsplit-dwarf
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756
else
757
DEBUG_CFLAGS	+= -g
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endif
759
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
761
ifdef CONFIG_DEBUG_INFO_DWARF4
762
DEBUG_CFLAGS	+= -gdwarf-4
763
endif
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765
ifdef CONFIG_DEBUG_INFO_REDUCED
766
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
767
		   $(call cc-option,-fno-var-tracking)
768 769
endif

770 771 772
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

773
ifdef CONFIG_FUNCTION_TRACER
774 775 776 777 778 779
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
780 781 782 783 784 785
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
786
endif
787
ifdef CONFIG_HAVE_FENTRY
788 789 790 791
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
792
endif
793 794 795
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
796
ifdef CONFIG_DYNAMIC_FTRACE
797
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
798 799 800 801
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
802 803
endif

804 805 806 807 808
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

809
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
810 811
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
812 813
endif

814
# 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)
816

L
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817
# warn about C99 declaration after statement
818
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
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819

K
Kees Cook 已提交
820 821 822
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
KBUILD_CFLAGS += $(call cc-option,-Wvla)

S
Sam Ravnborg 已提交
823
# disable pointer signed / unsigned warnings in gcc 4.0
824
KBUILD_CFLAGS += -Wno-pointer-sign
L
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825

826 827 828
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

829
# disable invalid "can't wrap" optimizations for signed / pointers
830
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
831

832 833 834 835 836 837 838 839 840
# 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)

841 842 843
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

844 845 846
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

847 848 849
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

850 851 852
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

853 854 855
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

856 857 858
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

859 860 861
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

862 863
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
864
include scripts/Makefile.ubsan
865

866 867 868 869 870
# 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)
871

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Roland McGrath 已提交
872
# Use --build-id when available.
873
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
874
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
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Roland McGrath 已提交
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LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

877
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
878
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
879 880
endif

881 882 883
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

884 885 886
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

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# Default kernel image to build when no specific target is given.
S
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888
# KBUILD_IMAGE may be overruled on the command line or
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889 890 891 892 893 894 895 896 897 898
# 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

899 900 901 902 903 904 905
#
# 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
909
# makefile but the argument can be passed to make if needed.
L
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910 911
#

912
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
913 914
export MODLIB

915
#
916 917 918 919
# 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.
920

921 922
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
923
mod_strip_cmd = $(STRIP) --strip-debug
924
else
925
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
926 927
endif # INSTALL_MOD_STRIP=1
else
928
mod_strip_cmd = true
929 930 931
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

932 933 934 935 936 937 938
# 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
939
    mod_compress_cmd = gzip -n -f
940 941
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
942
    mod_compress_cmd = xz -f
943 944 945 946
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

947
ifdef CONFIG_MODULE_SIG_ALL
948 949 950
$(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
951 952 953 954 955
else
mod_sign_cmd = true
endif
export mod_sign_cmd

956 957
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

958 959
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
960
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
961 962 963 964 965 966 967 968
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

969
PHONY += prepare0
970

L
Linus Torvalds 已提交
971
ifeq ($(KBUILD_EXTMOD),)
972
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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973 974 975

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
976
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
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977 978

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
979
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
L
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980

981 982 983 984
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
985
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
986 987
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
988

989
# Externally visible symbols (used by link-vmlinux.sh)
990 991
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
992
export KBUILD_VMLINUX_LIBS := $(libs-y1)
993
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
994
export LDFLAGS_vmlinux
995
# used by scripts/package/Makefile
996
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
997

998
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
999

1000 1001 1002
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
1003
ifdef CONFIG_TRIM_UNUSED_KSYMS
1004
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1005
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1006
endif
1007

1008 1009 1010 1011 1012 1013 1014
# 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

1015 1016 1017 1018 1019
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1020

1021 1022 1023
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1024
cmd_link-vmlinux =                                                 \
1025
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1026
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1027

1028
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1029
	+$(call if_changed,link-vmlinux)
1030

1031 1032
targets := vmlinux

1033
# Build samples along the rest of the kernel. This needs headers_install.
1034 1035
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
1036
samples: headers_install
1037 1038
endif

1039
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1040
# make sure no implicit rule kicks in
1041
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
Linus Torvalds 已提交
1042 1043 1044 1045 1046 1047 1048

# 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

1049
PHONY += $(vmlinux-dirs)
1050
$(vmlinux-dirs): prepare
1051
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
Linus Torvalds 已提交
1052

1053
filechk_kernel.release = \
1054 1055
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1056
# Store (new) KERNELRELEASE string in include/config/kernel.release
1057
include/config/kernel.release: $(srctree)/Makefile FORCE
1058
	$(call filechk,kernel.release)
1059

1060 1061 1062 1063
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1064
scripts: scripts_basic scripts_dtc
1065
	$(Q)$(MAKE) $(build)=$(@)
1066

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# Things we need to do before we recursively start building the kernel
1068 1069 1070 1071
# 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.
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1073
PHONY += prepare archprepare prepare1 prepare3
1074

1075
# prepare3 is used to check if we are building in a separate output directory,
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# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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prepare3: include/config/kernel.release
L
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ifneq ($(KBUILD_SRC),)
1080
	@$(kecho) '  Using $(srctree) as source for kernel'
R
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1081
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
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1082 1083
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
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		/bin/false; \
	fi;
endif

1088 1089
prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
						include/generated/utsrelease.h
S
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	$(cmd_crmodverdir)
L
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1091

1092
archprepare: archheaders archscripts prepare1 scripts
1093

1094
prepare0: archprepare
1095
	$(Q)$(MAKE) $(build)=scripts/mod
1096
	$(Q)$(MAKE) $(build)=.
1097

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# All the preparing..
1099 1100
prepare: prepare0 prepare-objtool

1101
# Support for using generic headers in asm-generic
1102 1103
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1104 1105
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1106 1107
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1108
uapi-asm-generic:
1109 1110
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1111

1112
PHONY += prepare-objtool
1113
prepare-objtool: $(objtool_target)
1114 1115 1116 1117 1118 1119 1120 1121
ifeq ($(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 $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1135
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
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endef
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1137 1138

define filechk_version.h
1139
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
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	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1141
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
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endef

1144
$(version_h): FORCE
L
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1145
	$(call filechk,version.h)
1146
	$(Q)rm -f $(old_version_h)
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1147

1148
include/generated/utsrelease.h: include/config/kernel.release FORCE
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	$(call filechk,utsrelease.h)

1151 1152
PHONY += headerdep
headerdep:
1153 1154
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1155

1156 1157 1158
# ---------------------------------------------------------------------------
# Kernel headers

1159 1160
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1161

1162 1163
# If we do an all arch process set dst to include/arch-$(SRCARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1164

1165
PHONY += archheaders archscripts
1166

1167
PHONY += __headers
1168
__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1169
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1170 1171

PHONY += headers_install_all
1172 1173
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1174

1175
PHONY += headers_install
1176
headers_install: __headers
1177
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1178
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1179
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1180
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1181

1182 1183
PHONY += headers_check_all
headers_check_all: headers_install_all
1184
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1185

1186 1187
PHONY += headers_check
headers_check: headers_install
1188
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1189
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1190

1191 1192 1193 1194
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1195 1196 1197 1198 1199
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1200
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1201

1202
PHONY += kselftest-clean
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kselftest-clean:
1204
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1206 1207 1208 1209 1210 1211 1212 1213
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
		-m $(objtree)/.config \
		$(srctree)/tools/testing/selftests/*/config
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
# ---------------------------------------------------------------------------
# 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) $(dtstree)/$@

1226 1227
PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc
1228 1229
	$(Q)$(MAKE) $(build)=$(dtstree)

1230 1231 1232
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
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

1246 1247 1248
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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

ifdef CONFIG_MODULES

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# By default, build modules as well
L
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1256
all: modules
L
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1257

1258
# Build modules
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1259
#
1260 1261 1262
# 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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1264
PHONY += modules
1265
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
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1266
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1267
	@$(kecho) '  Building modules, stage 2.';
S
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1268
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
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1270 1271 1272
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1273
%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1274 1275
	$(Q)$(MAKE) $(modbuiltin)=$*

L
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1276 1277

# Target to prepare building external modules
1278
PHONY += modules_prepare
1279
modules_prepare: prepare
L
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1280 1281

# Target to install modules
1282
PHONY += modules_install
L
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1283 1284
modules_install: _modinst_ _modinst_post

1285
PHONY += _modinst_
1286
_modinst_:
L
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1287 1288 1289
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1290
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1291 1292
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1293
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
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1294
	fi
T
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1295
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
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1296
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
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1297
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1298

1299
# This depmod is only for convenience to give the initial
L
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1300 1301
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1302
PHONY += _modinst_post
1303
_modinst_post: _modinst_
1304
	$(call cmd,depmod)
L
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J
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1306 1307 1308 1309 1310 1311
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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1312 1313 1314 1315 1316
else # CONFIG_MODULES

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

1317 1318
PHONY += modules modules_install
modules modules_install:
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1319 1320 1321 1322 1323
	@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'
1336
CLEAN_DIRS  += $(MODVERDIR) include/ksym
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1337 1338

# Directories & files removed with 'make mrproper'
S
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1339
MRPROPER_DIRS  += include/config usr/include include/generated          \
1340
		  arch/*/include/generated .tmp_objdiff
1341
MRPROPER_FILES += .config .config.old .version \
1342
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1343 1344
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
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1345
		  signing_key.x509.signer vmlinux-gdb.py
L
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1346 1347 1348 1349 1350

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1351
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
L
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1352

1353
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1354 1355 1356
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1357 1358
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1359
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1360 1361

clean: archclean vmlinuxclean
L
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1362 1363 1364 1365 1366

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1367
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1368

1369
PHONY += $(mrproper-dirs) mrproper
L
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1370 1371 1372
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1373
mrproper: clean $(mrproper-dirs)
L
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1374 1375 1376 1377 1378
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1379
PHONY += distclean
L
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1380 1381 1382

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
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1383
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1384 1385
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1386 1387 1388 1389 1390
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1391
package-dir	:= scripts/package
L
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1392

1393 1394
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1395
%pkg: include/config/kernel.release FORCE
S
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1396
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1397 1398 1399 1400 1401


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

1402
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403
boards := $(sort $(notdir $(boards)))
1404 1405
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1406

1407
PHONY += help
L
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1408 1409
help:
	@echo  'Cleaning targets:'
1410
	@echo  '  clean		  - Remove most generated files but keep the config and'
1411
	@echo  '                    enough build support to build external modules'
1412
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1413
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1414 1415 1416 1417 1418 1419 1420 1421
	@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'
1422
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
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1423
	@echo  '  dir/            - Build all files in dir and below'
1424
	@echo  '  dir/file.[ois]  - Build specified target only'
1425 1426
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1427 1428
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1429
	@echo  '  dir/file.ko     - Build module including final link'
1430
	@echo  '  modules_prepare - Set up for building external modules'
L
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1431 1432
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1433
	@echo  '  gtags           - Generate GNU GLOBAL index'
1434 1435 1436
	@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)'
1437
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1438
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1439
	 echo  ''
R
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1440
	@echo  'Static analysers:'
L
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1441 1442
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1443
	@echo  '  versioncheck    - Sanity check on version.h usage'
1444
	@echo  '  includecheck    - Check for duplicate included header files'
1445
	@echo  '  export_report   - List the usages of all exported symbols'
1446
	@echo  '  headers_check   - Sanity check on exported headers'
1447
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1448
	@echo  '  coccicheck      - Check with Coccinelle'
1449
	@echo  ''
R
Randy Dunlap 已提交
1450
	@echo  'Kernel selftest:'
1451 1452 1453
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
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1454
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1455
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456
	@echo  '                    .config.'
1457
	@echo  ''
1458 1459 1460 1461 1462 1463
	@$(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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1464 1465 1466 1467
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1468
	@echo  'Kernel packaging:'
S
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1469
	@$(MAKE) $(build)=$(package-dir) help
L
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1470 1471
	@echo  ''
	@echo  'Documentation targets:'
1472
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1473
	@echo  ''
1474
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1475
	@$(if $(archhelp),$(archhelp),\
1476
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1477 1478 1479 1480 1481
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1482 1483 1484 1485 1486
	@$(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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1487 1488

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1489
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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1490
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1491
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1492
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1493
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1494 1495 1496 1497
	@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'
1498
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
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1499 1500 1501 1502 1503
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1504 1505 1506 1507
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1508
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1509 1510 1511 1512 1513 1514 1515 1516 1517

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1520 1521
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1522 1523
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1524
	$(Q)$(MAKE) $(build)=Documentation $@
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1526 1527 1528 1529 1530
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
scripts_gdb: prepare
1531
	$(Q)$(MAKE) $(build)=scripts/gdb
1532
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1533 1534 1535 1536 1537

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

1560
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))
1569
PHONY += $(module-dirs) modules
1570
$(module-dirs): prepare $(objtree)/Module.symvers
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	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1574
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1576

1577
PHONY += modules_install
1578
modules_install: _emodinst_ _emodinst_post
1579

1580 1581
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1582 1583
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1586
PHONY += _emodinst_post
1587 1588 1589
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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

1592
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1597
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1599
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  ''
1608

1609
PHONY += prepare
1610 1611
prepare:
	$(cmd_crmodverdir)
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endif # KBUILD_EXTMOD

1614 1615 1616
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1617
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1618
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1619 1620
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1621
		-o -name '*.dwo' -o -name '*.lst' \
1622
		-o -name '*.su'  \
1623
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1624
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1625
		-o -name '*.asn1.[ch]' \
1626 1627
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1629
		-o -name '*.ll' \
1630 1631
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1634 1635
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1637
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

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

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1643 1644
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1646
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1648
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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1649 1650

versioncheck:
1651
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1653
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1654

1655 1656 1657
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1661 1662 1663
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1664
PHONY += checkstack kernelrelease kernelversion image_name
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1665

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1666 1667 1668 1669 1670 1671 1672 1673 1674
# 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 $$(find . -name '*.ko') | \
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1677
	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1679 1680
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1681

1682
kernelversion:
1683
	@echo $(KERNELVERSION)
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1685 1686 1687
image_name:
	@echo $(KBUILD_IMAGE)

1688
# Clear a bunch of variables before executing the submake
1689 1690 1691 1692 1693

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

1694
tools/: FORCE
1695
	$(Q)mkdir -p $(objtree)/tools
1696
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1697 1698

tools/%: FORCE
1699
	$(Q)mkdir -p $(objtree)/tools
1700
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1701

1702 1703
# Single targets
# ---------------------------------------------------------------------------
1704
# Single targets are compatible with:
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Robert P. J. Day 已提交
1705
# - build with mixed source and output
1706 1707 1708 1709 1710 1711
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
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
1729

1730
# Modules
1731 1732 1733
PHONY += /
/: ./

1734
# Make sure the latest headers are built for Documentation
1735
Documentation/ samples/: headers_install
1736
%/: prepare FORCE
1737
	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1738

1739
# 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)

1748
# Run depmod only if we have System.map and depmod is executable
1749
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1750
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1751
                   $(KERNELRELEASE)
1752

S
Sam Ravnborg 已提交
1753
# Create temporary dir for module support files
1754 1755 1756
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
L
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1757

1758 1759
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
L
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1760

1761
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1762

1763 1764
endif   # ifeq ($(config-targets),1)
endif   # ifeq ($(mixed-targets),1)
1765
endif   # need-sub-make
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1766

1767
PHONY += FORCE
L
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1768
FORCE:
1769

1770
# Declare the contents of the PHONY variable as phony.  We keep that
1771
# information in a variable so we can use it in if_changed and friends.
1772
.PHONY: $(PHONY)