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authorMasahiro Yamada <masahiroy@kernel.org>2020-06-26 21:59:12 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2020-07-07 05:13:10 +0300
commit893ab00439a45513cae55781fc8e3b7108ee1cda (patch)
treefb8fd6db0c947cd8040bf06e520ecc6329e56cba /arch/x86/um
parentdd7699e37f289fa433f42c6bcc108468c8b198c0 (diff)
downloadlinux-893ab00439a45513cae55781fc8e3b7108ee1cda.tar.xz
kbuild: remove cc-option test of -fno-stack-protector
Some Makefiles already pass -fno-stack-protector unconditionally. For example, arch/arm64/kernel/vdso/Makefile, arch/x86/xen/Makefile. No problem report so far about hard-coding this option. So, we can assume all supported compilers know -fno-stack-protector. GCC 4.8 and Clang support this option (https://godbolt.org/z/_HDGzN) Get rid of cc-option from -fno-stack-protector. Remove CONFIG_CC_HAS_STACKPROTECTOR_NONE, which is always 'y'. Note: arch/mips/vdso/Makefile adds -fno-stack-protector twice, first unconditionally, and second conditionally. I removed the second one. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to 'arch/x86/um')
-rw-r--r--arch/x86/um/vdso/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile
index 0caddd6acb22..5943387e3f35 100644
--- a/arch/x86/um/vdso/Makefile
+++ b/arch/x86/um/vdso/Makefile
@@ -42,7 +42,7 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE
# optimize sibling calls.
#
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
- $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
+ $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
-fno-omit-frame-pointer -foptimize-sibling-calls
$(vobjs): KBUILD_CFLAGS += $(CFL)