This is a note to let you know that I've just added the patch titled
x86, hash: Fix build failure with older binutils
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-hash-fix-build-failure-with-older-binutils.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 06325190bd577e11429444d54f454b9d13f560c9 Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@xxxxxxxx>
Date: Thu, 27 Feb 2014 08:47:02 +0000
Subject: x86, hash: Fix build failure with older binutils
From: Jan Beulich <JBeulich@xxxxxxxx>
commit 06325190bd577e11429444d54f454b9d13f560c9 upstream.
Just like for other ISA extension instruction uses we should check
whether the assembler actually supports them. The fallback here simply
is to encode an instruction with fixed operands (%eax and %ecx).
[ hpa: tagging for -stable as a build fix ]
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Link: http://lkml.kernel.org/r/530F0996020000780011FBE7@xxxxxxxxxxxxxxxxxxxx
Cc: Francesco Fusco <ffusco@xxxxxxxxxx>
Cc: Thomas Graf <tgraf@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Acked-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/Makefile | 1 +
arch/x86/lib/hash.c | 4 ++++
2 files changed, 5 insertions(+)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -152,6 +152,7 @@ cfi-sections := $(call as-instr,.cfi_sec
# does binutils support specific instructions?
asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
+asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
--- a/arch/x86/lib/hash.c
+++ b/arch/x86/lib/hash.c
@@ -39,7 +39,11 @@
static inline u32 crc32_u32(u32 crc, u32 val)
{
+#ifdef CONFIG_AS_CRC32
asm ("crc32l %1,%0\n" : "+r" (crc) : "rm" (val));
+#else
+ asm (".byte 0xf2, 0x0f, 0x38, 0xf1, 0xc1" : "+a" (crc) : "c" (val));
+#endif
return crc;
}
Patches currently in stable-queue which might be from JBeulich@xxxxxxxx are
queue-3.14/x86-hash-fix-build-failure-with-older-binutils.patch
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