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x86: remove always-defined CONFIG_AS_SSSE3

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CONFIG_AS_SSSE3 was introduced by commit 75aaf4c3e6 ("x86/raid6:
correctly check for assembler capabilities").

We raise the minimal supported binutils version from time to time.
The last bump was commit 1fb12b35e5 ("kbuild: Raise the minimum
required binutils version to 2.21").

I confirmed the code in $(call as-instr,...) can be assembled by the
binutils 2.21 assembler and also by LLVM integrated assembler.

Remove CONFIG_AS_SSSE3, which is always defined.

I added ifdef CONFIG_X86 to lib/raid6/algos.c to avoid link errors
on non-x86 architectures.

lib/raid6/algos.c is built not only for the kernel but also for
testing the library code from userspace. I added -DCONFIG_X86 to
lib/raid6/test/Makefile to cator to this usecase.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masahiro Yamada 2020-03-26 17:00:54 +09:00
parent 48e24723d0
commit 92203b0280
5 changed files with 4 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

2
lib/raid6/algos.c
View file

@ -97,13 +97,13 @@ void (*raid6_datap_recov)(int, size_t, int, void **);
EXPORT_SYMBOL_GPL(raid6_datap_recov);
const struct raid6_recov_calls *const raid6_recov_algos[] = {
#ifdef CONFIG_X86
#ifdef CONFIG_AS_AVX512
&raid6_recov_avx512,
#endif
#ifdef CONFIG_AS_AVX2
&raid6_recov_avx2,
#endif
#ifdef CONFIG_AS_SSSE3
&raid6_recov_ssse3,
#endif
#ifdef CONFIG_S390

6
lib/raid6/recov_ssse3.c
View file

@ -3,8 +3,6 @@
* Copyright (C) 2012 Intel Corporation
*/
#ifdef CONFIG_AS_SSSE3
#include <linux/raid/pq.h>
#include "x86.h"
@ -328,7 +326,3 @@ const struct raid6_recov_calls raid6_recov_ssse3 = {
#endif
.priority = 1,
};
#else
#warning "your version of binutils lacks SSSE3 support"
#endif

4
lib/raid6/test/Makefile
View file

@ -34,9 +34,7 @@ endif
ifeq ($(IS_X86),yes)
OBJS += mmx.o sse1.o sse2.o avx2.o recov_ssse3.o recov_avx2.o avx512.o recov_avx512.o
CFLAGS += $(shell echo "pshufb %xmm0, %xmm0" | \
gcc -c -x assembler - >/dev/null 2>&1 && \
rm ./-.o && echo -DCONFIG_AS_SSSE3=1)
CFLAGS += -DCONFIG_X86
CFLAGS += $(shell echo "vpbroadcastb %xmm0, %ymm1" | \
gcc -c -x assembler - >/dev/null 2>&1 && \
rm ./-.o && echo -DCONFIG_AS_AVX2=1)