From: trong@android.com (Tri Vo)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] arm64: lse: remove -fcall-used-x0 flag
Date: Wed, 19 Sep 2018 12:27:50 -0700 [thread overview]
Message-ID: <20180919192750.200491-1-trong@android.com> (raw)
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.
Signed-off-by: Tri Vo <trong@android.com>
---
arch/arm64/lib/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
index c86b7909ef31..2f7c60c8e588 100644
--- a/arch/arm64/lib/Makefile
+++ b/arch/arm64/lib/Makefile
@@ -11,7 +11,7 @@ lib-y := bitops.o clear_user.o delay.o copy_from_user.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 \
--
2.19.0.397.gdd90340f6a-goog
next reply other threads:[~2018-09-19 19:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-19 19:27 Tri Vo [this message]
2018-09-21 15:58 ` [RFC] arm64: lse: remove -fcall-used-x0 flag Will Deacon
2018-09-21 23:47 ` Tri Vo
2018-09-24 10:23 ` Catalin Marinas
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