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Masahiro Yamada 7f7f6f7ad6 Makefile: remove redundant tool coverage variables

Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the coverage for some objects:

  - include arch/mips/vdso/vdso-image.o into UBSAN, GCOV, KCOV
  - include arch/sparc/vdso/vdso-image-*.o into UBSAN
  - include arch/sparc/vdso/vma.o into UBSAN
  - include arch/x86/entry/vdso/extable.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso-image-*.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso32-setup.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vma.o into GCOV, KCOV
  - include arch/x86/um/vdso/vma.o into KASAN, GCOV, KCOV

I believe these are positive effects because all of them are kernel
space objects.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Roberto Sassu <roberto.sassu@huawei.com>

2024-05-14 23:35:48 +09:00

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SPDX-License-Identifier: GPL-2.0

Makefile for the linux kernel.

ccflags-y := -fno-function-sections -fno-data-sections

obj-y := main.o version.o mounts.o ifneq ($(CONFIG_BLK_DEV_INITRD),y) obj-y += noinitramfs.o else obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o endif obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o

obj-y += init_task.o

mounts-y := do_mounts.o mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o

UTS_VERSION

smp-flag-$(CONFIG_SMP) := SMP preempt-flag-$(CONFIG_PREEMPT_BUILD) := PREEMPT preempt-flag-$(CONFIG_PREEMPT_DYNAMIC) := PREEMPT_DYNAMIC preempt-flag-$(CONFIG_PREEMPT_RT) := PREEMPT_RT

build-version = $(or $(KBUILD_BUILD_VERSION), $(build-version-auto)) build-timestamp = $(or $(KBUILD_BUILD_TIMESTAMP), $(build-timestamp-auto))

Maximum length of UTS_VERSION is 64 chars

filechk_uts_version =
utsver=$$(echo '$(pound)'"$(build-version)" $(smp-flag-y) $(preempt-flag-y) "$(build-timestamp)" | cut -b -64);
echo '$(pound)'define UTS_VERSION ""$${utsver}""

Build version.c with temporary UTS_VERSION

$(obj)/utsversion-tmp.h: FORCE $(call filechk,uts_version)

clean-files += utsversion-tmp.h

$(obj)/version.o: $(obj)/utsversion-tmp.h CFLAGS_version.o := -include $(obj)/utsversion-tmp.h

Build version-timestamp.c with final UTS_VERSION

include/generated/utsversion.h: build-version-auto = $(shell $(src)/build-version) include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date) include/generated/utsversion.h: FORCE $(call filechk,uts_version)

$(obj)/version-timestamp.o: include/generated/utsversion.h CFLAGS_version-timestamp.o := -include include/generated/utsversion.h

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