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| author | Marco Elver <elver@google.com> | 2020-08-11 18:36:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-12 10:58:02 -0700 |
| commit | 31a1b9878c0667945b078c92bce907552f57f2b6 (patch) | |
| tree | ba62f4d76605efa3defd93d87f9f48a60a405c02 /kernel/Makefile | |
| parent | 63037f74725ddd8a767ed2ad0369e60a3bf1f2ce (diff) | |
| download | lwn-31a1b9878c0667945b078c92bce907552f57f2b6.tar.gz lwn-31a1b9878c0667945b078c92bce907552f57f2b6.zip | |
kcov: unconditionally add -fno-stack-protector to compiler options
Unconditionally add -fno-stack-protector to KCOV's compiler options, as
all supported compilers support the option. This saves a compiler
invocation to determine if the option is supported.
Because Clang does not support -fno-conserve-stack, and
-fno-stack-protector was wrapped in the same cc-option, we were missing
-fno-stack-protector with Clang. Unconditionally adding this option
fixes this for Clang.
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Link: http://lkml.kernel.org/r/20200615184302.7591-1-elver@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/Makefile')
| -rw-r--r-- | kernel/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/Makefile b/kernel/Makefile index 5350fd292910..b3da548691c9 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -36,7 +36,7 @@ KCOV_INSTRUMENT_stacktrace.o := n KCOV_INSTRUMENT_kcov.o := n KASAN_SANITIZE_kcov.o := n KCSAN_SANITIZE_kcov.o := n -CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) +CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector # cond_syscall is currently not LTO compatible CFLAGS_sys_ni.o = $(DISABLE_LTO) |