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# SPDX-License-Identifier: GPL-2.0
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VERSION = 4
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PATCHLEVEL = 19
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SUBLEVEL = 0
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EXTRAVERSION = -rc3
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NAME = Merciless Moray
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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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# o Do not use make's built-in rules and variables
#   (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
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# Avoid funny character set dependencies
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unexport LC_ALL
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LC_COLLATE=C
LC_NUMERIC=C
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export LC_COLLATE LC_NUMERIC
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# Avoid interference with shell env settings
unexport GREP_OPTIONS

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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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# 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_
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  tools_silent=s
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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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ifeq ($(KBUILD_SRC),)

# 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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# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

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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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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) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
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	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
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# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)

# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)

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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
  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		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
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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

# We need some generic definitions (do not try to remake the file).
scripts/Kbuild.include: ;
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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# SUBARCH tells the usermode build what the underlying arch is.  That is set
# first, and if a usermode build is happening, the "ARCH=um" on the command
# line overrides the setting of ARCH below.  If a native build is happening,
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# then ARCH is assigned, getting whatever value it gets normally, and
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# SUBARCH is subsequently ignored.

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SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
				  -e s/sun4u/sparc64/ \
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				  -e s/arm.*/arm/ -e s/sa110/arm/ \
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				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
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				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
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				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
				  -e s/riscv.*/riscv/)
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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
GENKSYMS	= scripts/genksyms/genksyms
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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__
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KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common -fshort-wchar \
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		   -Werror-implicit-function-declaration \
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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 GENKSYMS 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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# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

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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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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) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
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ifeq ($(cc-name),clang)
ifneq ($(CROSS_COMPILE),)
CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
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KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
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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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KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)

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# check for 'asm goto'
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ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
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  CC_HAVE_ASM_GOTO := 1
  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
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.
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
543
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.

556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593
# 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/
597
drivers-y	:= drivers/ sound/ firmware/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
601
virt-y		:= virt/
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endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
605
include include/config/auto.conf
606 607 608 609 610 611 612 613 614 615 616
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,)
617
export CFLAGS_GCOV
618 619 620 621 622 623 624

# 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/$(SRCARCH)/Makefile
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626
ifeq ($(dot-config),1)
627
ifeq ($(may-sync-config),1)
628 629 630
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
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-include include/config/auto.conf.cmd
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# To avoid any implicit rule to kick in, define an empty command
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$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
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636 637 638
# 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).
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include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
640
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
641
else
642 643 644
# 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
645 646 647
PHONY += include/config/auto.conf

include/config/auto.conf:
648
	$(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 ;							\
654 655
	/bin/false)

656
endif # may-sync-config
657
endif # $(dot-config)
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659
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
660
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
661 662 663
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)
664

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
666 667
KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
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else
669
ifdef CONFIG_PROFILE_ALL_BRANCHES
670
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
671 672 673
else
KBUILD_CFLAGS   += -O2
endif
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endif

676 677 678
KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
			$(call cc-disable-warning,maybe-uninitialized,))

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

682
include scripts/Makefile.kcov
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include scripts/Makefile.gcc-plugins

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

695
ifneq ($(CONFIG_FRAME_WARN),0)
696 697 698
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

699
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
700 701
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
702 703

KBUILD_CFLAGS += $(stackp-flags-y)
704

705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
ifeq ($(cc-name),clang)
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)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
endif

724
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
726
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
728 729 730 731 732 733
# 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
734
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
736
endif
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738 739
KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
else
744
KBUILD_CFLAGS	+= -g
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endif
746
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
748 749 750
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
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752
ifdef CONFIG_DEBUG_INFO_REDUCED
753 754
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
755 756
endif

757
ifdef CONFIG_FUNCTION_TRACER
758 759 760
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
761 762 763 764 765 766
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
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  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
773
endif
774
ifdef CONFIG_HAVE_FENTRY
775 776 777 778
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
779
endif
780 781 782
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
783
ifdef CONFIG_DYNAMIC_FTRACE
784
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
785 786 787 788
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
789 790
endif

791 792 793 794 795
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

796
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
797 798
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
799 800
endif

801
# arch Makefile may override CC so keep this after arch Makefile is included
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Masahiro Yamada 已提交
802
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
803

L
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804
# warn about C99 declaration after statement
805
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
L
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806

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Sam Ravnborg 已提交
807
# disable pointer signed / unsigned warnings in gcc 4.0
808
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
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810 811 812
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

813
# disable invalid "can't wrap" optimizations for signed / pointers
814
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
815

816 817 818 819 820 821 822 823 824
# 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)

825 826 827
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

828 829 830
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

831 832 833 834 835 836
# disallow errors like 'EXPORT_GPL(foo);' with missing header
KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)

# require functions to have arguments in prototypes, not empty 'int foo()'
KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)

837 838 839
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

840 841 842
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

843 844 845
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

846 847 848
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

849 850 851
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

852 853
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
854
include scripts/Makefile.ubsan
855

856 857 858 859 860
# 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)
861

R
Roland McGrath 已提交
862
# Use --build-id when available.
863
LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
864
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
865 866
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

867
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
868
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
869 870
endif

871 872 873
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

874 875 876
# 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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878
# KBUILD_IMAGE may be overruled on the command line or
L
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# 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

889 890 891 892 893 894 895
#
# 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
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899
# makefile but the argument can be passed to make if needed.
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900 901
#

902
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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export MODLIB

905
#
906 907 908 909
# 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.
910

911 912
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
913
mod_strip_cmd = $(STRIP) --strip-debug
914
else
915
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
916 917
endif # INSTALL_MOD_STRIP=1
else
918
mod_strip_cmd = true
919 920 921
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

922 923 924 925 926 927 928
# 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
929
    mod_compress_cmd = gzip -n -f
930 931
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
932
    mod_compress_cmd = xz -f
933 934 935 936
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

937 938 939
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
J
Jan Beulich 已提交
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INITRD_COMPRESS-y                  := gzip
INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
946 947 948
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
L
Linus Torvalds 已提交
949

950
ifdef CONFIG_MODULE_SIG_ALL
951 952 953
$(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
954 955 956 957 958
else
mod_sign_cmd = true
endif
export mod_sign_cmd

959 960 961 962 963 964
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
965 966
    ifdef CONFIG_UNWINDER_ORC
      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
967 968 969
    else
      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    endif
970 971 972 973 974
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

975

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976
ifeq ($(KBUILD_EXTMOD),)
977
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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978 979 980

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
981
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
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982 983

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
984
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
985

986 987 988 989
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
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libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
991 992
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
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994
# Externally visible symbols (used by link-vmlinux.sh)
995
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
996 997
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
export KBUILD_VMLINUX_LIBS := $(libs-y1)
998
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
999
export LDFLAGS_vmlinux
1000
# used by scripts/package/Makefile
1001
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1002

1003
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1004

1005 1006 1007
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
autoksyms_recursive: $(vmlinux-deps)
1008
ifdef CONFIG_TRIM_UNUSED_KSYMS
1009
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1010
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1011
endif
1012

1013 1014 1015 1016 1017 1018 1019
# 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

1020 1021 1022 1023 1024
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1025

1026 1027 1028
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1029
cmd_link-vmlinux =                                                 \
1030
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1031
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1032

1033 1034 1035 1036 1037 1038 1039
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
ifdef CONFIG_HEADERS_CHECK
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
ifdef CONFIG_GDB_SCRIPTS
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
endif
1040
	+$(call if_changed,link-vmlinux)
1041

1042
# Build samples along the rest of the kernel. This needs headers_install.
1043 1044
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
1045
samples: headers_install
1046 1047
endif

1048
# The actual objects are generated when descending,
L
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# make sure no implicit rule kicks in
1050
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
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1051 1052 1053 1054 1055 1056 1057

# 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

1058
PHONY += $(vmlinux-dirs)
1059
$(vmlinux-dirs): prepare scripts
1060
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
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1061

1062 1063 1064 1065
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

G
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1066
# Store (new) KERNELRELEASE string in include/config/kernel.release
1067
include/config/kernel.release: $(srctree)/Makefile FORCE
1068
	$(call filechk,kernel.release)
1069

1070 1071 1072 1073
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1074
scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1075
	$(Q)$(MAKE) $(build)=$(@)
1076

L
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# Things we need to do before we recursively start building the kernel
1078 1079 1080 1081
# 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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1083
# Listed in dependency order
1084
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1085

1086
# prepare3 is used to check if we are building in a separate output directory,
L
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1087 1088
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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1089
prepare3: include/config/kernel.release
L
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1090
ifneq ($(KBUILD_SRC),)
1091
	@$(kecho) '  Using $(srctree) as source for kernel'
R
Roman Zippel 已提交
1092
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
Michal Marek 已提交
1093 1094
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
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1095 1096 1097 1098
		/bin/false; \
	fi;
endif

1099 1100 1101
# prepare2 creates a makefile if using a separate output directory.
# From this point forward, .config has been reprocessed, so any rules
# that need to depend on updated CONFIG_* values can be checked here.
1102
prepare2: prepare3 outputmakefile asm-generic
L
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1103

1104
prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
S
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1105
	$(cmd_crmodverdir)
L
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1106

1107
archprepare: archheaders archscripts prepare1 scripts_basic
1108

E
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1109
prepare0: archprepare gcc-plugins
1110
	$(Q)$(MAKE) $(build)=.
1111

L
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1112
# All the preparing..
1113 1114
prepare: prepare0 prepare-objtool

1115 1116 1117 1118 1119 1120 1121 1122 1123
# Support for using generic headers in asm-generic
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
uapi-asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm

1124
PHONY += prepare-objtool
1125
prepare-objtool: $(objtool_target)
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1126 1127 1128 1129 1130 1131 1132 1133

# 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 $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
endef
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define filechk_version.h
J
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1143 1144
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
S
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1145
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
L
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1146 1147
endef

1148
$(version_h): FORCE
L
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1149
	$(call filechk,version.h)
1150
	$(Q)rm -f $(old_version_h)
L
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1151

1152
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1153 1154
	$(call filechk,utsrelease.h)

1155 1156
PHONY += headerdep
headerdep:
1157 1158
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1159

1160 1161 1162
# ---------------------------------------------------------------------------
# Kernel headers

1163 1164
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1165

1166 1167
# If we do an all arch process set dst to include/arch-$(SRCARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1168

1169 1170 1171
PHONY += archheaders
archheaders:

1172 1173 1174
PHONY += archscripts
archscripts:

1175
PHONY += __headers
1176
__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1177
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1178 1179

PHONY += headers_install_all
1180 1181
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1182

1183
PHONY += headers_install
1184
headers_install: __headers
1185
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1186
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1187
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1188
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1189

1190 1191
PHONY += headers_check_all
headers_check_all: headers_install_all
1192
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1193

1194 1195
PHONY += headers_check
headers_check: headers_install
1196
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1197
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1198

1199 1200 1201 1202 1203
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1204
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1205

1206
PHONY += kselftest-clean
W
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1207
kselftest-clean:
1208
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1209

1210 1211 1212 1213 1214 1215 1216 1217
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

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1218 1219 1220 1221 1222
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
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1223
# By default, build modules as well
L
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1224

1225
all: modules
L
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1226

1227
# Build modules
T
Tejun Heo 已提交
1228
#
1229 1230 1231
# 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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1232

1233
PHONY += modules
1234
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
Tejun Heo 已提交
1235
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1236
	@$(kecho) '  Building modules, stage 2.';
S
Sam Ravnborg 已提交
1237
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
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1238

1239 1240 1241
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1242
%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1243 1244
	$(Q)$(MAKE) $(modbuiltin)=$*

L
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1245 1246

# Target to prepare building external modules
1247
PHONY += modules_prepare
1248
modules_prepare: prepare scripts
L
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1249 1250

# Target to install modules
1251
PHONY += modules_install
L
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1252 1253
modules_install: _modinst_ _modinst_post

1254
PHONY += _modinst_
1255
_modinst_:
L
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1256 1257 1258
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1259
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1260 1261
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1262
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
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1263
	fi
T
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1264
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1265
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
Sam Ravnborg 已提交
1266
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1267

1268
# This depmod is only for convenience to give the initial
L
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1269 1270
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1271
PHONY += _modinst_post
1272
_modinst_post: _modinst_
1273
	$(call cmd,depmod)
L
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1274

J
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1275 1276 1277 1278 1279 1280
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
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1281 1282 1283 1284 1285
else # CONFIG_MODULES

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

1286 1287
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1288 1289 1290 1291 1292
	@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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1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
	@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'
1305
CLEAN_DIRS  += $(MODVERDIR) include/ksym
L
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1306 1307

# Directories & files removed with 'make mrproper'
S
Sam Ravnborg 已提交
1308
MRPROPER_DIRS  += include/config usr/include include/generated          \
1309
		  arch/*/include/generated .tmp_objdiff
1310
MRPROPER_FILES += .config .config.old .version \
1311
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1312 1313
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1314
		  signing_key.x509.signer vmlinux-gdb.py
L
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1315 1316 1317 1318 1319

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1320
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
L
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1321

1322
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1323 1324 1325
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1326 1327
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1328
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1329 1330

clean: archclean vmlinuxclean
L
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1331 1332 1333 1334 1335

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1336
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1337

1338
PHONY += $(mrproper-dirs) mrproper archmrproper
L
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1339 1340 1341 1342 1343 1344 1345 1346 1347
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

mrproper: clean archmrproper $(mrproper-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1348
PHONY += distclean
L
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1349 1350 1351

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1352
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1353 1354
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1355 1356 1357 1358 1359
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1360
package-dir	:= scripts/package
L
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1361

1362 1363
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1364
%pkg: include/config/kernel.release FORCE
S
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1365
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1366 1367 1368 1369 1370


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

1371
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1372
boards := $(sort $(notdir $(boards)))
1373 1374
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1375

1376
PHONY += help
L
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1377 1378
help:
	@echo  'Cleaning targets:'
1379
	@echo  '  clean		  - Remove most generated files but keep the config and'
1380
	@echo  '                    enough build support to build external modules'
1381
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1382
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1383 1384 1385 1386 1387 1388 1389 1390
	@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'
1391
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1392
	@echo  '  dir/            - Build all files in dir and below'
1393
	@echo  '  dir/file.[ois]  - Build specified target only'
1394 1395
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1396 1397
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1398
	@echo  '  dir/file.ko     - Build module including final link'
1399
	@echo  '  modules_prepare - Set up for building external modules'
L
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1400 1401
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1402
	@echo  '  gtags           - Generate GNU GLOBAL index'
1403 1404 1405
	@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)'
1406
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1407
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1408
	 echo  ''
R
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1409
	@echo  'Static analysers:'
L
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1410 1411
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1412
	@echo  '  versioncheck    - Sanity check on version.h usage'
1413
	@echo  '  includecheck    - Check for duplicate included header files'
1414
	@echo  '  export_report   - List the usages of all exported symbols'
1415
	@echo  '  headers_check   - Sanity check on exported headers'
1416
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1417
	@echo  '  coccicheck      - Check with Coccinelle'
1418
	@echo  ''
R
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1419
	@echo  'Kernel selftest:'
1420 1421 1422
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1423
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1424
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1425
	@echo  '                    .config.'
1426
	@echo  ''
R
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1427 1428 1429 1430
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
Linus Torvalds 已提交
1431
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1432
	@$(MAKE) $(build)=$(package-dir) help
L
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1433 1434
	@echo  ''
	@echo  'Documentation targets:'
1435
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1436
	@echo  ''
1437
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1438
	@$(if $(archhelp),$(archhelp),\
1439
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1440 1441 1442 1443 1444
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1445 1446 1447 1448 1449
	@$(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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1450 1451

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1452
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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1453
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1454
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1455
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1456
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1457 1458 1459 1460
	@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'
1461
	@echo  '		Multiple levels can be combined with W=12 or W=123'
L
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1462 1463 1464 1465 1466
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1467 1468 1469 1470
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1471
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1472 1473 1474 1475 1476 1477 1478 1479 1480

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1483 1484
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1485 1486
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1487
	$(Q)$(MAKE) $(build)=Documentation $@
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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
1510
PHONY += crmodverdir
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crmodverdir:
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	$(cmd_crmodverdir)
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1514
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))
1523
PHONY += $(module-dirs) modules
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$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1528
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1531
PHONY += modules_install
1532
modules_install: _emodinst_ _emodinst_post
1533

1534 1535
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1536 1537
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1540
PHONY += _emodinst_post
1541 1542 1543
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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

1546
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1551
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1553
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  ''
1562 1563

# Dummies...
1564
PHONY += prepare scripts
1565 1566
prepare: ;
scripts: ;
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endif # KBUILD_EXTMOD

1569 1570 1571
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1572
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1573
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1574
		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1575
		-o -name '*.dwo' -o -name '*.lst' \
1576
		-o -name '*.su'  \
1577
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1578
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1579
		-o -name '*.asn1.[ch]' \
1580 1581
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1583
		-o -name '*.ll' \
1584 1585
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1588 1589
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1591
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:
1600
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1602
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1605
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1607
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1609 1610 1611
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1615 1616 1617
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

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endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

1621
PHONY += checkstack kernelrelease kernelversion image_name
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# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
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checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
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	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1636 1637
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1638

1639
kernelversion:
1640
	@echo $(KERNELVERSION)
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1642 1643 1644
image_name:
	@echo $(KBUILD_IMAGE)

1645 1646
# Clear a bunch of variables before executing the submake
tools/: FORCE
1647
	$(Q)mkdir -p $(objtree)/tools
1648
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1649 1650

tools/%: FORCE
1651
	$(Q)mkdir -p $(objtree)/tools
1652
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1653

1654 1655
# Single targets
# ---------------------------------------------------------------------------
1656
# Single targets are compatible with:
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# - build with mixed source and output
1658 1659 1660 1661 1662 1663 1664
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
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        build-dir  = $(patsubst %/,%,$(dir $@))
1666 1667 1668 1669 1670 1671 1672
        target-dir = $(dir $@)
else
        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

1673
%.s: %.c prepare scripts FORCE
1674
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675
%.i: %.c prepare scripts FORCE
1676
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677
%.o: %.c prepare scripts FORCE
1678
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679
%.lst: %.c prepare scripts FORCE
1680
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681
%.s: %.S prepare scripts FORCE
1682
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683
%.o: %.S prepare scripts FORCE
1684
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 1686
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 1688
%.ll: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689

1690
# Modules
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/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
1695
# Make sure the latest headers are built for Documentation
1696
Documentation/ samples/: headers_install
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%/: prepare scripts FORCE
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1698
	$(cmd_crmodverdir)
1699
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1700 1701
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
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1702
	$(cmd_crmodverdir)
1703
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1704
	$(build)=$(build-dir) $(@:.ko=.o)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1706

1707
# 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)

1716
# Run depmod only if we have System.map and depmod is executable
1717
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1719
                   $(KERNELRELEASE)
1720

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1721
# Create temporary dir for module support files
1722 1723 1724
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
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# read all saved command lines

1728
cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
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ifneq ($(cmd_files),)
  $(cmd_files): ;	# Do not try to update included dependency files
  include $(cmd_files)
endif

endif	# skip-makefile

1737
PHONY += FORCE
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1738
FORCE:
1739

1740
# Declare the contents of the PHONY variable as phony.  We keep that
1741
# information in a variable so we can use it in if_changed and friends.
1742
.PHONY: $(PHONY)