linux-kernel - [PATCH] powerpc/lib/xor_vmx: Relax frame size for clang

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Date:   Fri, 21 Jun 2019 10:58:22 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Joel Stanley <joel@....id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/lib/xor_vmx: Relax frame size for clang

When building with clang-8 the frame size limit is hit:

  ../arch/powerpc/lib/xor_vmx.c:119:6: error: stack frame size of 1200 bytes in function '__xor_altivec_5' [-Werror,-Wframe-larger-than=]

Follow the same approach as commit 9c87156cce5a ("powerpc/xmon: Relax
frame size for clang") until a proper fix is implemented upstream in
clang and relax requirement for clang.

Link: https://github.com/ClangBuiltLinux/linux/issues/563
Cc: Joel Stanley <joel@....id.au>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
 arch/powerpc/lib/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index c55f9c27bf79..b3f7d64caaf0 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -58,5 +58,9 @@ obj-$(CONFIG_FTR_FIXUP_SELFTEST) += feature-fixups-test.o
 
 obj-$(CONFIG_ALTIVEC)	+= xor_vmx.o xor_vmx_glue.o
 CFLAGS_xor_vmx.o += -maltivec $(call cc-option,-mabi=altivec)
+ifdef CONFIG_CC_IS_CLANG
+# See https://github.com/ClangBuiltLinux/linux/issues/563
+CFLAGS_xor_vmx.o += -Wframe-larger-than=4096
+endif
 
 obj-$(CONFIG_PPC64) += $(obj64-y)
-- 
2.20.1