| Message ID | 1518527587-18260-1-git-send-email-will.deacon@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index 4e696f96451f..c287b58b257a 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -17,6 +17,6 @@ CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \ -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \ -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \ -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15 \ - -fcall-saved-x18 + -fcall-saved-x18 -fomit-frame-pointer lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
In cases where x30 is used as a temporary in the out-of-line ll/sc atomics (e.g. atomic_fetch_add), the compiler tends to put out a full stackframe, which included pointing the x29 at the new frame. Since these things aren't traceable anyway, we can pass -fomit-frame-pointer to reduce the work when spilling. Signed-off-by: Will Deacon <will.deacon@arm.com> --- arch/arm64/lib/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)