[PATCH 4.14 189/222] arm64: lse: remove -fcall-used-x0 flag

Greg Kroah-Hartman
2018-11-11T22:53:11Z

From: Tri Vo <trong@android.com>

commit 2a6c7c367de82951c98a290a21156770f6f82c84 upstream.

x0 is not callee-saved in the PCS. So there is no need to specify
-fcall-used-x0.

Clang doesn't currently support -fcall-used flags. This patch will help
building the kernel with clang.

Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Tri Vo <trong@android.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arm64/lib/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/lib/Makefile
+++ b/arch/arm64/lib/Makefile
@@ -12,7 +12,7 @@ lib-y := bitops.o clear_user.o delay.o
# when supported by the CPU. Result and argument registers are handled
# correctly, based on the function prototype.
lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
-CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \
+CFLAGS_atomic_ll_sc.o := -ffixed-x1 -ffixed-x2 \
-ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6 \
-ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \
-fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \