diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 821 |
1 files changed, 428 insertions, 393 deletions
@@ -1,9 +1,9 @@ # SPDX-License-Identifier: GPL-2.0 VERSION = 6 -PATCHLEVEL = 5 +PATCHLEVEL = 18 SUBLEVEL = 0 EXTRAVERSION = -NAME = Hurr durr I'ma ninja sloth +NAME = Baby Opossum Posse # *DOCUMENTATION* # To see a list of typical targets execute "make help" @@ -11,8 +11,8 @@ NAME = Hurr durr I'ma ninja sloth # Comments in this file are targeted only to the developer, do not # expect to learn how to build the kernel reading this file. -ifeq ($(filter undefine,$(.FEATURES)),) -$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION)) +ifeq ($(filter output-sync,$(.FEATURES)),) +$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) endif $(if $(filter __%, $(MAKECMDGOALS)), \ @@ -39,8 +39,8 @@ __all: # prepare rule. this-makefile := $(lastword $(MAKEFILE_LIST)) -export abs_srctree := $(realpath $(dir $(this-makefile))) -export abs_objtree := $(CURDIR) +abs_srctree := $(realpath $(dir $(this-makefile))) +abs_output := $(CURDIR) ifneq ($(sub_make_done),1) @@ -93,15 +93,7 @@ endif # If the user is running make -s (silent mode), suppress echoing of # commands -# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. - -ifeq ($(filter 3.%,$(MAKE_VERSION)),) -short-opts := $(firstword -$(MAKEFLAGS)) -else -short-opts := $(filter-out --%,$(MAKEFLAGS)) -endif - -ifneq ($(findstring s,$(short-opts)),) +ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) quiet=silent_ override KBUILD_VERBOSE := endif @@ -142,6 +134,10 @@ ifeq ("$(origin M)", "command line") KBUILD_EXTMOD := $(M) endif +ifeq ("$(origin MO)", "command line") + KBUILD_EXTMOD_OUTPUT := $(MO) +endif + $(if $(word 2, $(KBUILD_EXTMOD)), \ $(error building multiple external modules is not supported)) @@ -155,6 +151,12 @@ endif export KBUILD_EXTMOD +ifeq ("$(origin W)", "command line") + KBUILD_EXTRA_WARN := $(W) +endif + +export KBUILD_EXTRA_WARN + # Kbuild will save output files in the current working directory. # This does not need to match to the root of the kernel source tree. # @@ -175,39 +177,51 @@ export KBUILD_EXTMOD # The O= assignment takes precedence over the KBUILD_OUTPUT environment # variable. -# Do we want to change the working directory? ifeq ("$(origin O)", "command line") KBUILD_OUTPUT := $(O) endif -ifneq ($(KBUILD_OUTPUT),) -# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot -# expand a shell special character '~'. We use a somewhat tedious way here. -abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) -$(if $(abs_objtree),, \ - $(error failed to create output directory "$(KBUILD_OUTPUT)")) +ifdef KBUILD_EXTMOD + ifdef KBUILD_OUTPUT + objtree := $(realpath $(KBUILD_OUTPUT)) + $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) + else + objtree := $(abs_srctree) + endif + # If Make is invoked from the kernel directory (either kernel + # source directory or kernel build directory), external modules + # are built in $(KBUILD_EXTMOD) for backward compatibility, + # otherwise, built in the current directory. + output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) + # KBUILD_EXTMOD might be a relative path. Remember its absolute path before + # Make changes the working directory. + srcroot := $(realpath $(KBUILD_EXTMOD)) + $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) +else + objtree := . + output := $(KBUILD_OUTPUT) +endif + +export objtree srcroot +# Do we want to change the working directory? +ifneq ($(output),) +# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. +$(shell mkdir -p "$(output)") # $(realpath ...) resolves symlinks -abs_objtree := $(realpath $(abs_objtree)) -endif # ifneq ($(KBUILD_OUTPUT),) +abs_output := $(realpath $(output)) +$(if $(abs_output),,$(error failed to create output directory "$(output)")) +endif ifneq ($(words $(subst :, ,$(abs_srctree))), 1) $(error source directory cannot contain spaces or colons) endif -ifneq ($(filter 3.%,$(MAKE_VERSION)),) -# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x -# We need to invoke sub-make to avoid implicit rules in the top Makefile. -need-sub-make := 1 -# Cancel implicit rules for this Makefile. -$(this-makefile): ; -endif - export sub_make_done := 1 endif # sub_make_done -ifeq ($(abs_objtree),$(CURDIR)) +ifeq ($(abs_output),$(CURDIR)) # Suppress "Entering directory ..." if we are at the final work directory. no-print-directory := --no-print-directory else @@ -231,35 +245,40 @@ $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make # Invoke a second make in the output directory, passing relevant variables __sub-make: - $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ + $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ -f $(abs_srctree)/Makefile $(MAKECMDGOALS) else # need-sub-make # We process the rest of the Makefile if this is the final invocation of make -ifeq ($(abs_srctree),$(abs_objtree)) - # building in the source tree - srctree := . - building_out_of_srctree := +ifndef KBUILD_EXTMOD +srcroot := $(abs_srctree) +endif + +ifeq ($(srcroot),$(CURDIR)) +building_out_of_srctree := else - ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) - # building in a subdirectory of the source tree - srctree := .. - else - srctree := $(abs_srctree) - endif - building_out_of_srctree := 1 +export building_out_of_srctree := 1 endif -ifneq ($(KBUILD_ABS_SRCTREE),) -srctree := $(abs_srctree) +ifdef KBUILD_ABS_SRCTREE + # Do nothing. Use the absolute path. +else ifeq ($(srcroot),$(CURDIR)) + # Building in the source. + srcroot := . +else ifeq ($(srcroot)/,$(dir $(CURDIR))) + # Building in a subdirectory of the source. + srcroot := .. endif -objtree := . -VPATH := $(srctree) +export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) -export building_out_of_srctree srctree objtree VPATH +ifdef building_out_of_srctree +export VPATH := $(srcroot) +else +VPATH := +endif # 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 @@ -277,72 +296,63 @@ no-dot-config-targets := $(clean-targets) \ $(version_h) headers headers_% archheaders archscripts \ %asm-generic kernelversion %src-pkg dt_binding_check \ outputmakefile rustavailable rustfmt rustfmtcheck -# Installation targets should not require compiler. Unfortunately, vdso_install -# is an exception where build artifacts may be updated. This must be fixed. -no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ - headers_install modules_install kernelrelease image_name -no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ +no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ image_name -single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ +single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ config-build := mixed-build := need-config := 1 -need-compiler := 1 may-sync-config := 1 single-build := ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) - ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) - need-config := - endif -endif - -ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) - ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) - need-compiler := - endif + ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) + need-config := + endif endif ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) - ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) - may-sync-config := - endif + ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) + may-sync-config := + endif endif +need-compiler := $(may-sync-config) + ifneq ($(KBUILD_EXTMOD),) - may-sync-config := + may-sync-config := endif ifeq ($(KBUILD_EXTMOD),) - ifneq ($(filter %config,$(MAKECMDGOALS)),) - config-build := 1 - ifneq ($(words $(MAKECMDGOALS)),1) - mixed-build := 1 - endif + ifneq ($(filter %config,$(MAKECMDGOALS)),) + config-build := 1 + ifneq ($(words $(MAKECMDGOALS)),1) + mixed-build := 1 endif + endif endif # We cannot build single targets and the others at the same time ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) - single-build := 1 - ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) - mixed-build := 1 - endif + single-build := 1 + ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) + mixed-build := 1 + endif endif # For "make -j clean all", "make -j mrproper defconfig all", etc. ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) - ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) - mixed-build := 1 - endif + ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) + mixed-build := 1 + endif endif # install and modules_install need also be processed one by one ifneq ($(filter install,$(MAKECMDGOALS)),) - ifneq ($(filter modules_install,$(MAKECMDGOALS)),) - mixed-build := 1 - endif + ifneq ($(filter modules_install,$(MAKECMDGOALS)),) + mixed-build := 1 + endif endif ifdef mixed-build @@ -366,7 +376,7 @@ else # !mixed-build include $(srctree)/scripts/Kbuild.include # Read KERNELRELEASE from include/config/kernel.release (if it exists) -KERNELRELEASE = $(call read-file, include/config/kernel.release) +KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION @@ -378,7 +388,7 @@ include $(srctree)/scripts/subarch.include # 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 +# make ARCH=arm64 # Another way is to have ARCH set in the environment. # The default ARCH is the host where make is executed. @@ -386,7 +396,7 @@ include $(srctree)/scripts/subarch.include # 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- +# make CROSS_COMPILE=aarch64-linux-gnu- # 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 @@ -448,6 +458,11 @@ endif HOSTRUSTC = rustc HOSTPKG_CONFIG = pkg-config +# the KERNELDOC macro needs to be exported, as scripts/Makefile.build +# has a logic to call it +KERNELDOC = $(srctree)/scripts/kernel-doc.py +export KERNELDOC + KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ -O2 -fomit-frame-pointer -std=gnu11 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) @@ -457,25 +472,39 @@ KBUILD_USERLDFLAGS := $(USERLDFLAGS) # host programs. export rust_common_flags := --edition=2021 \ -Zbinary_dep_depinfo=y \ - -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ - -Dunreachable_pub -Dnon_ascii_idents \ + -Astable_features \ + -Dnon_ascii_idents \ + -Dunsafe_op_in_unsafe_fn \ -Wmissing_docs \ - -Drustdoc::missing_crate_level_docs \ - -Dclippy::correctness -Dclippy::style \ - -Dclippy::suspicious -Dclippy::complexity \ - -Dclippy::perf \ - -Dclippy::let_unit_value -Dclippy::mut_mut \ - -Dclippy::needless_bitwise_bool \ - -Dclippy::needless_continue \ - -Dclippy::no_mangle_with_rust_abi \ - -Wclippy::dbg_macro - -KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) -KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) + -Wrust_2018_idioms \ + -Wunreachable_pub \ + -Wclippy::all \ + -Wclippy::as_ptr_cast_mut \ + -Wclippy::as_underscore \ + -Wclippy::cast_lossless \ + -Wclippy::ignored_unit_patterns \ + -Wclippy::mut_mut \ + -Wclippy::needless_bitwise_bool \ + -Aclippy::needless_lifetimes \ + -Wclippy::no_mangle_with_rust_abi \ + -Wclippy::ptr_as_ptr \ + -Wclippy::ptr_cast_constness \ + -Wclippy::ref_as_ptr \ + -Wclippy::undocumented_unsafe_blocks \ + -Wclippy::unnecessary_safety_comment \ + -Wclippy::unnecessary_safety_doc \ + -Wrustdoc::missing_crate_level_docs \ + -Wrustdoc::unescaped_backticks + +KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ + $(HOSTCFLAGS) -I $(srctree)/scripts/include +KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ + -I $(srctree)/scripts/include KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ -Zallow-features= $(HOSTRUSTFLAGS) KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) +KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) # Make variables (CC, etc...) CPP = $(CC) -E @@ -503,14 +532,12 @@ RUSTDOC = rustdoc RUSTFMT = rustfmt CLIPPY_DRIVER = clippy-driver BINDGEN = bindgen -CARGO = cargo PAHOLE = pahole RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids LEX = flex YACC = bison AWK = awk INSTALLKERNEL := installkernel -DEPMOD = depmod PERL = perl PYTHON3 = python3 CHECK = sparse @@ -519,11 +546,10 @@ KGZIP = gzip KBZIP2 = bzip2 KLZOP = lzop LZMA = lzma -LZ4 = lz4c +LZ4 = lz4 XZ = xz ZSTD = zstd - -PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) +TAR = tar CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) @@ -551,7 +577,7 @@ USERINCLUDE := \ LINUXINCLUDE := \ -I$(srctree)/arch/$(SRCARCH)/include \ -I$(objtree)/arch/$(SRCARCH)/include/generated \ - $(if $(building_out_of_srctree),-I$(srctree)/include) \ + -I$(srctree)/include \ -I$(objtree)/include \ $(USERINCLUDE) @@ -564,24 +590,15 @@ KBUILD_CFLAGS += -funsigned-char KBUILD_CFLAGS += -fno-common KBUILD_CFLAGS += -fno-PIE KBUILD_CFLAGS += -fno-strict-aliasing -KBUILD_CFLAGS += -Wall -KBUILD_CFLAGS += -Wundef -KBUILD_CFLAGS += -Werror=implicit-function-declaration -KBUILD_CFLAGS += -Werror=implicit-int -KBUILD_CFLAGS += -Werror=return-type -KBUILD_CFLAGS += -Werror=strict-prototypes -KBUILD_CFLAGS += -Wno-format-security -KBUILD_CFLAGS += -Wno-trigraphs KBUILD_CPPFLAGS := -D__KERNEL__ KBUILD_RUSTFLAGS := $(rust_common_flags) \ - --target=$(objtree)/scripts/target.json \ -Cpanic=abort -Cembed-bitcode=n -Clto=n \ -Cforce-unwind-tables=n -Ccodegen-units=1 \ -Csymbol-mangling-version=v0 \ -Crelocation-model=static \ -Zfunction-sections=n \ - -Dclippy::float_arithmetic + -Wclippy::float_arithmetic KBUILD_AFLAGS_KERNEL := KBUILD_CFLAGS_KERNEL := @@ -601,20 +618,19 @@ else RUSTC_OR_CLIPPY = $(RUSTC) endif -ifdef RUST_LIB_SRC - export RUST_LIB_SRC -endif - # Allows the usage of unstable features in stable compilers. export RUSTC_BOOTSTRAP := 1 +# Allows finding `.clippy.toml` in out-of-srctree builds. +export CLIPPY_CONF_DIR := $(srctree) + export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG -export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO +export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN export HOSTRUSTC KBUILD_HOSTRUSTFLAGS export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX -export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD -export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE +export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR +export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS @@ -623,15 +639,12 @@ export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL -export PAHOLE_FLAGS # Files to ignore in find ... statements 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 -export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ - --exclude CVS --exclude .pc --exclude .hg --exclude .git # =========================================================================== # Rules shared between *config targets and build targets @@ -650,13 +663,25 @@ ifdef building_out_of_srctree # At the same time when output Makefile generated, generate .gitignore to # ignore whole output directory +ifdef KBUILD_EXTMOD +print_env_for_makefile = \ + echo "export KBUILD_OUTPUT = $(objtree)"; \ + echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ + echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" +else +print_env_for_makefile = \ + echo "export KBUILD_OUTPUT = $(CURDIR)" +endif + quiet_cmd_makefile = GEN Makefile cmd_makefile = { \ - echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ - echo "include $(srctree)/Makefile"; \ + echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ + $(print_env_for_makefile); \ + echo "include $(abs_srctree)/Makefile"; \ } > Makefile outputmakefile: +ifeq ($(KBUILD_EXTMOD),) @if [ -f $(srctree)/.config -o \ -d $(srctree)/include/config -o \ -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ @@ -666,7 +691,16 @@ outputmakefile: echo >&2 "***"; \ false; \ fi - $(Q)ln -fsn $(srctree) source +else + @if [ -f $(srcroot)/modules.order ]; then \ + echo >&2 "***"; \ + echo >&2 "*** The external module source tree is not clean."; \ + echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ + echo >&2 "***"; \ + false; \ + fi +endif + $(Q)ln -fsn $(srcroot) source $(call cmd,makefile) $(Q)test -e .gitignore || \ { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore @@ -674,9 +708,11 @@ endif # The expansion should be delayed until arch/$(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 and RUSTC_VERSION_TEXT are referenced from Kconfig (so they +# need export), and from include/config/auto.conf.cmd to detect the compiler +# upgrade. CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) +RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) include $(srctree)/scripts/Makefile.clang @@ -693,11 +729,11 @@ ifdef config-build # *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. +# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. # KBUILD_DEFCONFIG may point out an alternative default configuration # used for 'make defconfig' include $(srctree)/arch/$(SRCARCH)/Makefile -export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT +export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT config: outputmakefile scripts_basic FORCE $(Q)$(MAKE) $(build)=scripts/kconfig $@ @@ -707,7 +743,7 @@ config: outputmakefile scripts_basic FORCE else #!config-build # =========================================================================== -# Build targets only - this includes vmlinux, arch specific targets, clean +# Build targets only - this includes vmlinux, arch-specific targets, clean # targets and others. In general all targets except *config targets. # If building an external module we do not care about the all: rule @@ -725,7 +761,7 @@ targets := # Normally, just do built-in. KBUILD_MODULES := -KBUILD_BUILTIN := 1 +KBUILD_BUILTIN := y # If we have only "make modules", don't compile built-in objects. ifeq ($(MAKECMDGOALS),modules) @@ -736,18 +772,18 @@ endif # in addition to whatever we do anyway. # Just "make" or "make all" shall build modules as well -ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) - KBUILD_MODULES := 1 +ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) + KBUILD_MODULES := y endif ifeq ($(MAKECMDGOALS),) - KBUILD_MODULES := 1 + KBUILD_MODULES := y endif export KBUILD_MODULES KBUILD_BUILTIN ifdef need-config -include include/config/auto.conf +include $(objtree)/include/config/auto.conf endif ifeq ($(KBUILD_EXTMOD),) @@ -774,6 +810,25 @@ ifdef CONFIG_FUNCTION_TRACER CC_FLAGS_FTRACE := -pg endif +ifdef CONFIG_TRACEPOINTS +# To check for unused tracepoints (tracepoints that are defined but never +# called), run with: +# +# make UT=1 +# +# Each unused tracepoints can take up to 5KB of memory in the running kernel. +# It is best to remove any that are not used. +# +# This command line option will be removed when all current unused +# tracepoints are removed. + +ifeq ("$(origin UT)", "command line") + WARN_ON_UNUSED_TRACEPOINTS := $(UT) +endif +endif # CONFIG_TRACEPOINTS + +export WARN_ON_UNUSED_TRACEPOINTS + include $(srctree)/arch/$(SRCARCH)/Makefile ifdef need-config @@ -808,26 +863,27 @@ $(KCONFIG_CONFIG): else # !may-sync-config # 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 -PHONY += include/config/auto.conf - -include/config/auto.conf: - @test -e include/generated/autoconf.h -a -e $@ || ( \ - 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 ; \ - /bin/false) +# Use auto.conf to show the error message + +checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) +missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) + +ifdef missing-configs +PHONY += $(objtree)/include/config/auto.conf + +$(objtree)/include/config/auto.conf: + @echo >&2 '***' + @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' + @printf >&2 '*** - %s\n' $(missing-configs) + @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' + @echo >&2 '***' + @/bin/false +endif endif # may-sync-config endif # need-config KBUILD_CFLAGS += -fno-delete-null-pointer-checks -KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) -KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) -KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) -KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE KBUILD_CFLAGS += -O2 @@ -858,40 +914,12 @@ ifdef CONFIG_READABLE_ASM KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining endif -ifneq ($(CONFIG_FRAME_WARN),0) -KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) -endif - stackp-flags-y := -fno-stack-protector stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong KBUILD_CFLAGS += $(stackp-flags-y) -KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror -KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) -KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds - -KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings -KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) - -ifdef CONFIG_CC_IS_CLANG -# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. -KBUILD_CFLAGS += -Wno-gnu -else - -# gcc inanely warns about local variables called 'main' -KBUILD_CFLAGS += -Wno-main -endif - -# 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) -KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) - -# These result in bogus false positives -KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) - ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y @@ -924,10 +952,16 @@ KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) endif endif +# Explicitly clear padding bits during variable initialization +KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) + # While VLAs have been removed, GCC produces unreachable stack probes # for the randomize_kstack_offset feature. Disable it for all compilers. KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) +# Get details on warnings generated due to GCC value tracking. +KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) + # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). ifdef CONFIG_ZERO_CALL_USED_REGS KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr @@ -982,6 +1016,7 @@ ifdef CONFIG_SHADOW_CALL_STACK ifndef CONFIG_DYNAMIC_SCS CC_FLAGS_SCS := -fsanitize=shadow-call-stack KBUILD_CFLAGS += $(CC_FLAGS_SCS) +KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack endif export CC_FLAGS_SCS endif @@ -989,7 +1024,6 @@ endif ifdef CONFIG_LTO_CLANG ifdef CONFIG_LTO_CLANG_THIN CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit -KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache else CC_FLAGS_LTO := -flto endif @@ -997,14 +1031,6 @@ CC_FLAGS_LTO += -fvisibility=hidden # Limit inlining across translation units to reduce binary size KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 - -# Check for frame size exceeding threshold during prolog/epilog insertion -# when using lld < 13.0.0. -ifneq ($(CONFIG_FRAME_WARN),0) -ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) -KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) -endif -endif endif ifdef CONFIG_LTO @@ -1013,63 +1039,52 @@ KBUILD_AFLAGS += -fno-lto export CC_FLAGS_LTO endif -ifdef CONFIG_CFI_CLANG +ifdef CONFIG_CFI CC_FLAGS_CFI := -fsanitize=kcfi +ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS + CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers +endif +ifdef CONFIG_FINEIBT_BHI + CC_FLAGS_CFI += -fsanitize-kcfi-arity +endif +ifdef CONFIG_RUST + # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects + # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. + RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers + KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) + export RUSTC_FLAGS_CFI +endif KBUILD_CFLAGS += $(CC_FLAGS_CFI) export CC_FLAGS_CFI endif +# Architectures can define flags to add/remove for floating-point support +CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT +export CC_FLAGS_FPU +export CC_FLAGS_NO_FPU + ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) +# Set the minimal function alignment. Use the newer GCC option +# -fmin-function-alignment if it is available, or fall back to -falign-funtions. +# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. +ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT +KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) +else KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) endif +endif # arch Makefile may override CC so keep this after arch Makefile is included NOSTDINC_FLAGS += -nostdinc -# Variable Length Arrays (VLAs) should not be used anywhere in the kernel -KBUILD_CFLAGS += -Wvla - -# disable pointer signed / unsigned warnings in gcc 4.0 -KBUILD_CFLAGS += -Wno-pointer-sign - -# In order to make sure new function cast mismatches are not introduced -# in the kernel (to avoid tripping CFI checking), the kernel should be -# globally built with -Wcast-function-type. -KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) - # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, # the kernel uses only C99 flexible arrays for dynamically sized trailing # arrays. Enforce this for everything that may examine structure sizes and # perform bounds checking. KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) -# disable stringop warnings in gcc 8+ -KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) - -# We'll want to enable this eventually, but it's not going away for 5.7 at least -KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) - -# Another good warning that we'll want to enable eventually -KBUILD_CFLAGS += $(call cc-disable-warning, restrict) - -# Enabled with W=2, disabled by default as noisy -ifdef CONFIG_CC_IS_GCC -KBUILD_CFLAGS += -Wno-maybe-uninitialized -endif - -# The allocators already balk at large sizes, so silence the compiler -# warnings for bounds checks involving those possible values. While -# -Wno-alloc-size-larger-than would normally be used here, earlier versions -# of gcc (<9.1) weirdly don't handle the option correctly when _other_ -# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX -# doesn't work (as it is documented to), silently resolving to "0" prior to -# version 9.1 (and producing an error more recently). Numeric values larger -# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently -# ignored, continuing to default to PTRDIFF_MAX. So, left with no other -# choice, we must perform a versioned check to disable this warning. -# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au -KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than -KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) +# Allow including a tagged struct or union anonymously in another struct/union. +KBUILD_CFLAGS += -fms-extensions # disable invalid "can't wrap" optimizations for signed / pointers KBUILD_CFLAGS += -fno-strict-overflow @@ -1082,27 +1097,27 @@ ifdef CONFIG_CC_IS_GCC KBUILD_CFLAGS += -fconserve-stack endif -# Prohibit date/time macros, which would make the build non-deterministic -KBUILD_CFLAGS += -Werror=date-time - -# enforce correct pointer usage -KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) - -# Require designated initializers for all marked structures -KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) +# Ensure compilers do not transform certain loops into calls to wcslen() +KBUILD_CFLAGS += -fno-builtin-wcslen -# change __FILE__ to the relative path from the srctree -KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) +# change __FILE__ to the relative path to the source directory +ifdef building_out_of_srctree +KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) +endif # include additional Makefiles when needed -include-y := scripts/Makefile.extrawarn +include-y := scripts/Makefile.warn include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug +include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf include-$(CONFIG_KASAN) += scripts/Makefile.kasan include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan include-$(CONFIG_KCOV) += scripts/Makefile.kcov include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct +include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase +include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo +include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins include $(addprefix $(srctree)/, $(include-y)) @@ -1140,9 +1155,28 @@ ifdef CONFIG_LD_ORPHAN_WARN LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) endif -# Align the bit size of userspace programs with the kernel -KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) -KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) +ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) +LDFLAGS_vmlinux += --emit-relocs --discard-none +endif + +# Align the architecture of userspace programs with the kernel +USERFLAGS_FROM_KERNEL := --target=% + +ifdef CONFIG_ARCH_USERFLAGS +KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) +KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) +else +# If not overridden also inherit the bit size +USERFLAGS_FROM_KERNEL += -m32 -m64 +endif + +KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) +KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) + +# userspace programs are linked via the compiler, use the correct linker +ifdef CONFIG_CC_IS_CLANG +KBUILD_USERLDFLAGS += --ld-path=$(LD) +endif # make the checker run with the right architecture CHECKFLAGS += --arch=$(ARCH) @@ -1183,10 +1217,6 @@ export MODLIB PHONY += prepare0 -export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) -export MODORDER := $(extmod_prefix)modules.order -export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps - ifeq ($(KBUILD_EXTMOD),) build-dir := . @@ -1199,13 +1229,8 @@ export ARCH_LIB := $(filter %/, $(libs-y)) export ARCH_DRIVERS := $(drivers-y) $(drivers-m) # Externally visible symbols (used by link-vmlinux.sh) -KBUILD_VMLINUX_OBJS := ./built-in.a -ifdef CONFIG_MODULES -KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) +KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) -else -KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) -endif export KBUILD_VMLINUX_LIBS export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds @@ -1213,7 +1238,7 @@ export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds ifdef CONFIG_TRIM_UNUSED_KSYMS # For the kernel to actually contain only the needed exported symbols, # we have to build modules as well to determine what those symbols are. -KBUILD_MODULES := 1 +KBUILD_MODULES := y endif # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 @@ -1281,7 +1306,8 @@ PHONY += prepare archprepare archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ asm-generic $(version_h) include/generated/utsrelease.h \ - include/generated/compile.h include/generated/autoconf.h remove-stale-files + include/generated/compile.h include/generated/autoconf.h \ + include/generated/rustc_cfg remove-stale-files prepare0: archprepare $(Q)$(MAKE) $(build)=scripts/mod @@ -1290,7 +1316,7 @@ prepare0: archprepare # All the preparing.. prepare: prepare0 ifdef CONFIG_RUST - $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh + +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh $(Q)$(MAKE) $(build)=rust endif @@ -1299,7 +1325,7 @@ remove-stale-files: $(Q)$(srctree)/scripts/remove-stale-files # Support for using generic headers in asm-generic -asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj +asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj PHONY += asm-generic uapi-asm-generic asm-generic: uapi-asm-generic @@ -1339,8 +1365,8 @@ define filechk_version.h echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) endef -$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) -$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) +$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) +$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) $(version_h): FORCE $(call filechk,version.h) @@ -1379,10 +1405,13 @@ PHONY += archheaders archscripts hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj PHONY += headers -headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts - $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) +headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders +ifdef HEADER_ARCH + $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers +else $(Q)$(MAKE) $(hdr-inst)=include/uapi $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi +endif ifdef CONFIG_HEADERS_INSTALL prepare: headers @@ -1392,6 +1421,10 @@ PHONY += scripts_unifdef scripts_unifdef: scripts_basic $(Q)$(MAKE) $(build)=scripts scripts/unifdef +PHONY += scripts_gen_packed_field_checks +scripts_gen_packed_field_checks: scripts_basic + $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks + # --------------------------------------------------------------------------- # Install @@ -1404,6 +1437,14 @@ quiet_cmd_install = INSTALL $(INSTALL_PATH) cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh # --------------------------------------------------------------------------- +# vDSO install + +PHONY += vdso_install +vdso_install: export INSTALL_FILES = $(vdso-install-y) +vdso_install: + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst + +# --------------------------------------------------------------------------- # Tools ifdef CONFIG_OBJTOOL @@ -1416,6 +1457,12 @@ prepare: tools/bpf/resolve_btfids endif endif +# The tools build system is not a part of Kbuild and tends to introduce +# its own unique issues. If you need to integrate a new tool into Kbuild, +# please consider locating that tool outside the tools/ tree and using the +# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry +# here. See Documentation/kbuild/makefiles.rst for details. + PHONY += resolve_btfids_clean resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids @@ -1427,18 +1474,13 @@ ifneq ($(wildcard $(resolve_btfids_O)),) $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean endif -# Clear a bunch of variables before executing the submake -ifeq ($(quiet),silent_) -tools_silent=s -endif - tools/: FORCE $(Q)mkdir -p $(objtree)/tools - $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ + $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ tools/%: FORCE $(Q)mkdir -p $(objtree)/tools - $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* + $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* # --------------------------------------------------------------------------- # Kernel selftest @@ -1453,8 +1495,8 @@ kselftest-%: headers FORCE PHONY += kselftest-merge kselftest-merge: $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) - $(Q)find $(srctree)/tools/testing/selftests -name config | \ - xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config + $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ + xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig # --------------------------------------------------------------------------- @@ -1474,7 +1516,7 @@ ifneq ($(dtstree),) PHONY += dtbs dtbs_prepare dtbs_install dtbs_check dtbs: dtbs_prepare - $(Q)$(MAKE) $(build)=$(dtstree) + $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 # include/config/kernel.release is actually needed when installing DTBs because # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make @@ -1486,18 +1528,22 @@ export CHECK_DTBS=y endif ifneq ($(CHECK_DTBS),) -dtbs_prepare: dt_binding_check +dtbs_prepare: dt_binding_schemas endif dtbs_check: dtbs dtbs_install: - $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) ifdef CONFIG_OF_EARLY_FLATTREE all: dtbs endif +ifdef CONFIG_GENERIC_BUILTIN_DTB +vmlinux: dtbs +endif + endif PHONY += scripts_dtc @@ -1505,15 +1551,18 @@ scripts_dtc: scripts_basic $(Q)$(MAKE) $(build)=scripts/dtc ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) -export CHECK_DT_BINDING=y +export CHECK_DTBS=y endif -PHONY += dt_binding_check -dt_binding_check: scripts_dtc +PHONY += dt_binding_check dt_binding_schemas +dt_binding_check: dt_binding_schemas scripts_dtc + $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ + +dt_binding_schemas: $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings PHONY += dt_compatible_check -dt_compatible_check: dt_binding_check +dt_compatible_check: dt_binding_schemas $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ # --------------------------------------------------------------------------- @@ -1529,7 +1578,7 @@ all: modules # the built-in objects during the descend as well, in order to # make sure the checksums are up to date before we record them. ifdef CONFIG_MODVERSIONS - KBUILD_BUILTIN := 1 + KBUILD_BUILTIN := y endif # Build modules @@ -1538,7 +1587,7 @@ endif # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES # is an exception. ifdef CONFIG_DEBUG_INFO_BTF_MODULES -KBUILD_BUILTIN := 1 +KBUILD_BUILTIN := y modules: vmlinux endif @@ -1548,44 +1597,8 @@ modules: modules_prepare modules_prepare: prepare $(Q)$(MAKE) $(build)=scripts scripts/module.lds -export modules_sign_only := - -ifeq ($(CONFIG_MODULE_SIG),y) -PHONY += modules_sign -modules_sign: modules_install - @: - -# modules_sign is a subset of modules_install. -# 'make modules_install modules_sign' is equivalent to 'make modules_install'. -ifeq ($(filter modules_install,$(MAKECMDGOALS)),) -modules_sign_only := y -endif -endif - endif # CONFIG_MODULES -modinst_pre := -ifneq ($(filter modules_install,$(MAKECMDGOALS)),) -modinst_pre := __modinst_pre -endif - -modules_install: $(modinst_pre) -PHONY += __modinst_pre -__modinst_pre: - @rm -rf $(MODLIB)/kernel - @rm -f $(MODLIB)/source - @mkdir -p $(MODLIB) -ifdef CONFIG_MODULES - @ln -s $(abspath $(srctree)) $(MODLIB)/source - @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ - rm -f $(MODLIB)/build ; \ - ln -s $(CURDIR) $(MODLIB)/build ; \ - fi - @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order -endif - @cp -f modules.builtin $(MODLIB)/ - @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ - ### # Cleaning is done on three levels. # make clean Delete most generated files @@ -1594,26 +1607,28 @@ endif # make distclean Remove editor backup files, patch leftover files and the like # Directories & files removed with 'make clean' -CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ +CLEAN_FILES += vmlinux.symvers modules-only.symvers \ modules.builtin modules.builtin.modinfo modules.nsdeps \ - compile_commands.json .thinlto-cache rust/test rust/doc \ - rust-project.json .vmlinux.objs .vmlinux.export.c + modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ + compile_commands.json rust/test \ + rust-project.json .vmlinux.objs .vmlinux.export.c \ + .builtin-dtbs-list .builtin-dtb.S # Directories & files removed with 'make mrproper' MRPROPER_FILES += include/config include/generated \ arch/$(SRCARCH)/include/generated .objdiff \ - debian snap tar-install \ + debian snap tar-install PKGBUILD pacman \ .config .config.old .version \ Module.symvers \ certs/signing_key.pem \ certs/x509.genkey \ vmlinux-gdb.py \ - *.spec rpmbuild \ - rust/libmacros.so + rpmbuild \ + rust/libmacros.so rust/libmacros.dylib # clean - Delete most, but leave enough to build external modules # -clean: rm-files := $(CLEAN_FILES) +clean: private rm-files := $(CLEAN_FILES) PHONY += archclean vmlinuxclean @@ -1625,7 +1640,7 @@ clean: archclean vmlinuxclean resolve_btfids_clean # mrproper - Delete all generated files, including .config # -mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) +mrproper: private rm-files := $(MRPROPER_FILES) mrproper-dirs := $(addprefix _mrproper_,scripts) PHONY += $(mrproper-dirs) mrproper @@ -1675,7 +1690,6 @@ help: @echo ' mrproper - Remove all generated files + config + various backup files' @echo ' distclean - mrproper + remove editor backup and patch files' @echo '' - @echo 'Configuration targets:' @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help @echo '' @echo 'Other generic targets:' @@ -1683,6 +1697,7 @@ help: @echo '* vmlinux - Build the bare kernel' @echo '* modules - Build all modules' @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' + @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' @echo ' dir/ - Build all files in dir and below' @echo ' dir/file.[ois] - Build specified target only' @echo ' dir/file.ll - Build the LLVM assembly file' @@ -1697,14 +1712,15 @@ help: @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)' - @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ + @echo ' headers - Build ready-to-install UAPI headers in usr/include' + @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ echo ' (default: $(INSTALL_HDR_PATH))'; \ echo '' @echo 'Static analysers:' - @echo ' checkstack - Generate a list of stack hogs' + @echo ' checkstack - Generate a list of stack hogs and consider all functions' + @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' @echo ' versioncheck - Sanity check on version.h usage' @echo ' includecheck - Check for duplicate included header files' - @echo ' export_report - List the usages of all exported symbols' @echo ' headerdep - Detect inclusion cycles in headers' @echo ' coccicheck - Check with Coccinelle' @echo ' clang-analyzer - Check with clang static analyzer' @@ -1744,10 +1760,11 @@ help: @echo '' @$(if $(dtstree), \ echo 'Devicetree:'; \ - echo '* dtbs - Build device tree blobs for enabled boards'; \ - echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ - echo ' dt_binding_check - Validate device tree binding documents'; \ - echo ' dtbs_check - Validate device tree source files';\ + echo '* dtbs - Build device tree blobs for enabled boards'; \ + echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ + echo ' dt_binding_check - Validate device tree binding documents and examples'; \ + echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ + echo ' dtbs_check - Validate device tree source files';\ echo '') @echo 'Userspace tools targets:' @@ -1760,9 +1777,9 @@ help: @echo 'Documentation targets:' @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp @echo '' - @echo 'Architecture specific targets ($(SRCARCH)):' + @echo 'Architecture-specific targets ($(SRCARCH)):' @$(or $(archhelp),\ - echo ' No architecture specific help defined for $(SRCARCH)') + echo ' No architecture-specific help defined for $(SRCARCH)') @echo '' @$(if $(boards), \ $(foreach b, $(boards), \ @@ -1782,12 +1799,15 @@ help: @echo ' (sparse by default)' @echo ' make C=2 [targets] Force check of all c source with $$CHECK' @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' - @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' + @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e 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' + @echo ' c: extra checks in the configuration stage (Kconfig)' @echo ' e: warnings are being treated as errors' @echo ' Multiple levels can be combined with W=12 or W=123' + @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' + @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' @$(if $(dtstree), \ echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ @@ -1804,7 +1824,7 @@ help-boards: $(help-board-dirs) boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) $(help-board-dirs): help-%: - @echo 'Architecture specific targets ($(SRCARCH) $*):' + @echo 'Architecture-specific targets ($(SRCARCH) $*):' @$(if $(boards-per-dir), \ $(foreach b, $(boards-per-dir), \ printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ @@ -1814,7 +1834,9 @@ $(help-board-dirs): help-%: # Documentation targets # --------------------------------------------------------------------------- DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ - linkcheckdocs dochelp refcheckdocs texinfodocs infodocs + linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ + htmldocs-redirects + PHONY += $(DOC_TARGETS) $(DOC_TARGETS): $(Q)$(MAKE) $(build)=Documentation $@ @@ -1826,7 +1848,7 @@ $(DOC_TARGETS): # "Is Rust available?" target PHONY += rustavailable rustavailable: - $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" + +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" # Documentation target # @@ -1841,20 +1863,18 @@ rusttest: prepare $(Q)$(MAKE) $(build)=rust $@ # Formatting targets +# +# Generated files as well as vendored crates are skipped. PHONY += rustfmt rustfmtcheck -# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. -# -# We match using absolute paths since `find` does not resolve them -# when matching, which is a problem when e.g. `srctree` is `..`. -# We `grep` afterwards in order to remove the directory entry itself. rustfmt: - $(Q)find $(abs_srctree) -type f -name '*.rs' \ - -o -path $(abs_srctree)/rust/alloc -prune \ - -o -path $(abs_objtree)/rust/test -prune \ - | grep -Fv $(abs_srctree)/rust/alloc \ - | grep -Fv $(abs_objtree)/rust/test \ - | grep -Fv generated \ + $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ + \( \ + -path $(srctree)/rust/proc-macro2 \ + -o -path $(srctree)/rust/quote \ + -o -path $(srctree)/rust/syn \ + \) -prune -o \ + -type f -a -name '*.rs' -a ! -name '*generated*' -print \ | xargs $(RUSTFMT) $(rustfmt_flags) rustfmtcheck: rustfmt_flags = --check @@ -1891,16 +1911,12 @@ filechk_kernel.release = echo $(KERNELRELEASE) # We are always building only modules. KBUILD_BUILTIN := -KBUILD_MODULES := 1 +KBUILD_MODULES := y -build-dir := $(KBUILD_EXTMOD) +build-dir := . -compile_commands.json: $(extmod_prefix)compile_commands.json -PHONY += compile_commands.json - -clean-dirs := $(KBUILD_EXTMOD) -clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ - $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache +clean-dirs := . +clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json PHONY += prepare # now expand this into a simple variable to reduce the cost of shell evaluations @@ -1923,23 +1939,43 @@ help: @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' @echo '' +ifndef CONFIG_MODULES +modules modules_install: __external_modules_error __external_modules_error: @echo >&2 '***' @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' @echo >&2 '*** You cannot build or install external modules.' @echo >&2 '***' @false +endif endif # KBUILD_EXTMOD # --------------------------------------------------------------------------- # Modules -PHONY += modules modules_install modules_prepare +PHONY += modules modules_install modules_sign modules_prepare + +modules_install: + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ + sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) + +ifeq ($(CONFIG_MODULE_SIG),y) +# modules_sign is a subset of modules_install. +# 'make modules_install modules_sign' is equivalent to 'make modules_install'. +modules_sign: modules_install + @: +else +modules_sign: + @echo >&2 '***' + @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' + @echo >&2 '***' + @false +endif ifdef CONFIG_MODULES -$(MODORDER): $(build-dir) +modules.order: $(build-dir) @: # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. @@ -1950,25 +1986,12 @@ ifneq ($(KBUILD_MODPOST_NOFINAL),1) endif PHONY += modules_check -modules_check: $(MODORDER) +modules_check: modules.order $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< -quiet_cmd_depmod = DEPMOD $(MODLIB) - cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ - $(KERNELRELEASE) - -modules_install: - $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst - $(call cmd,depmod) - else # CONFIG_MODULES -# Modules not configured -# --------------------------------------------------------------------------- - -PHONY += __external_modules_error - -modules modules_install: __external_modules_error +modules: @: KBUILD_MODULES := @@ -2004,22 +2027,24 @@ $(single-ko): single_modules $(single-no-ko): $(build-dir) @: -# Remove MODORDER when done because it is not the real one. +# Remove modules.order when done because it is not the real one. PHONY += single_modules single_modules: $(single-no-ko) modules_prepare - $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) + $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost ifneq ($(KBUILD_MODPOST_NOFINAL),1) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal endif - $(Q)rm -f $(MODORDER) + $(Q)rm -f modules.order single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) -KBUILD_MODULES := 1 +KBUILD_MODULES := y endif +prepare: outputmakefile + # 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. @@ -2035,12 +2060,12 @@ $(clean-dirs): clean: $(clean-dirs) $(call cmd,rmfiles) - @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ + @find . $(RCS_FIND_IGNORE) \ \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ -o -name '*.ko.*' \ -o -name '*.dtb' -o -name '*.dtbo' \ -o -name '*.dtb.S' -o -name '*.dtbo.S' \ - -o -name '*.dt.yaml' \ + -o -name '*.dt.yaml' -o -name 'dtbs-list' \ -o -name '*.dwo' -o -name '*.lst' \ -o -name '*.su' -o -name '*.mod' \ -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ @@ -2050,7 +2075,7 @@ clean: $(clean-dirs) -o -name '*.c.[012]*.*' \ -o -name '*.ll' \ -o -name '*.gcno' \ - -o -name '*.*.symversions' \) -type f -print \ + \) -type f -print \ -o -name '.tmp_*' -print \ | xargs rm -rf @@ -2062,10 +2087,18 @@ quiet_cmd_tags = GEN $@ tags TAGS cscope gtags: FORCE $(call cmd,tags) -# IDE support targets +# Generate rust-project.json (a file that describes the structure of non-Cargo +# Rust projects) for rust-analyzer (an implementation of the Language Server +# Protocol). PHONY += rust-analyzer rust-analyzer: + +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh +ifdef KBUILD_EXTMOD +# FIXME: external modules must not descend into a sub-directory of the kernel + $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ +else $(Q)$(MAKE) $(build)=rust $@ +endif # Script to generate missing namespace dependencies # --------------------------------------------------------------------------- @@ -2081,12 +2114,12 @@ nsdeps: modules quiet_cmd_gen_compile_commands = GEN $@ cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) -$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ +compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ - $(if $(CONFIG_MODULES), $(MODORDER)) FORCE + $(if $(CONFIG_MODULES), modules.order) FORCE $(call if_changed,gen_compile_commands) -targets += $(extmod_prefix)compile_commands.json +targets += compile_commands.json PHONY += clang-tidy clang-analyzer @@ -2094,7 +2127,7 @@ ifdef CONFIG_CC_IS_CLANG quiet_cmd_clang_tools = CHECK $< cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< -clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json +clang-tidy clang-analyzer: compile_commands.json $(call cmd,clang_tools) else clang-tidy clang-analyzer: @@ -2105,7 +2138,7 @@ endif # Scripts to check various things for consistency # --------------------------------------------------------------------------- -PHONY += includecheck versioncheck coccicheck export_report +PHONY += includecheck versioncheck coccicheck includecheck: find $(srctree)/* $(RCS_FIND_IGNORE) \ @@ -2120,9 +2153,6 @@ versioncheck: coccicheck: $(Q)$(BASH) $(srctree)/scripts/$@ -export_report: - $(PERL) $(srctree)/scripts/export_report.pl - PHONY += checkstack kernelrelease kernelversion image_name # UML needs a little special treatment here. It wants to use the host @@ -2134,9 +2164,10 @@ CHECKSTACK_ARCH := $(SUBARCH) else CHECKSTACK_ARCH := $(ARCH) endif +MINSTACKSIZE ?= 100 checkstack: $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ - $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) + $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) kernelrelease: @$(filechk_kernel.release) @@ -2147,6 +2178,10 @@ kernelversion: image_name: @echo $(KBUILD_IMAGE) +PHONY += run-command +run-command: + $(Q)$(KBUILD_RUN_COMMAND) + quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) cmd_rmfiles = rm -rf $(rm-files) |