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Subject[PATCH v2 06/16] x86: remove always-defined CONFIG_AS_SSSE3
Date
CONFIG_AS_SSSE3 was introduced by commit 75aaf4c3e6a4 ("x86/raid6:
correctly check for assembler capabilities").

We raise the minimal supported binutils version from time to time.
The last bump was commit 1fb12b35e5ff ("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>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
---

Changes in v2: None

arch/x86/Makefile | 5 ++---
arch/x86/crypto/blake2s-core.S | 2 --
lib/raid6/algos.c | 2 +-
lib/raid6/recov_ssse3.c | 6 ------
lib/raid6/test/Makefile | 4 +---
5 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index e4a062313bb0..94f89612e024 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -178,7 +178,6 @@ ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
endif

# does binutils support specific instructions?
-asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
@@ -186,8 +185,8 @@ sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=
sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
adx_instr := $(call as-instr,adox %r10$(comma)%r10,-DCONFIG_AS_ADX=1)

-KBUILD_AFLAGS += $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)
-KBUILD_CFLAGS += $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)
+KBUILD_AFLAGS += $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)
+KBUILD_CFLAGS += $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)

KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)

diff --git a/arch/x86/crypto/blake2s-core.S b/arch/x86/crypto/blake2s-core.S
index 24910b766bdd..2ca79974f819 100644
--- a/arch/x86/crypto/blake2s-core.S
+++ b/arch/x86/crypto/blake2s-core.S
@@ -46,7 +46,6 @@ SIGMA2:
#endif /* CONFIG_AS_AVX512 */

.text
-#ifdef CONFIG_AS_SSSE3
SYM_FUNC_START(blake2s_compress_ssse3)
testq %rdx,%rdx
je .Lendofloop
@@ -174,7 +173,6 @@ SYM_FUNC_START(blake2s_compress_ssse3)
.Lendofloop:
ret
SYM_FUNC_END(blake2s_compress_ssse3)
-#endif /* CONFIG_AS_SSSE3 */

#ifdef CONFIG_AS_AVX512
SYM_FUNC_START(blake2s_compress_avx512)
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index bf1b4765c8f6..df08664d3432 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -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
diff --git a/lib/raid6/recov_ssse3.c b/lib/raid6/recov_ssse3.c
index 1de97d2405d0..4bfa3c6b60de 100644
--- a/lib/raid6/recov_ssse3.c
+++ b/lib/raid6/recov_ssse3.c
@@ -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
diff --git a/lib/raid6/test/Makefile b/lib/raid6/test/Makefile
index b9e6c3648be1..60021319ac78 100644
--- a/lib/raid6/test/Makefile
+++ b/lib/raid6/test/Makefile
@@ -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)
--
2.17.1
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