From 6b24442d68e78c57c8837920ea5dfb252571847a Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 9 Feb 2018 13:19:47 +0000 Subject: [PATCH] arm64: lse: Pass -fomit-frame-pointer to out-of-line ll/sc atomics 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. Since this is incompatible with -pg, we also remove that from the CFLAGS for this file. Signed-off-by: Will Deacon --- arch/arm64/lib/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index 4e696f96451f..0ead8a1d1679 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -17,6 +17,7 @@ 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 +CFLAGS_REMOVE_atomic_ll_sc.o := -pg lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o -- 2.30.2