linux-kernel - [PATCH 5/7] x86: remove always-defined CONFIG_AS

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Message-Id: <20200323020844.17064-6-masahiroy@kernel.org>
Date:   Mon, 23 Mar 2020 11:08:42 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     x86@...nel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     linux-kernel@...r.kernel.org,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Allison Randal <allison@...utok.net>,
        Armijn Hemel <armijn@...ldur.nl>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Song Liu <songliubraving@...com>,
        Zhengyuan Liu <liuzhengyuan@...inos.cn>,
        clang-built-linux@...glegroups.com, linux-crypto@...r.kernel.org
Subject: [PATCH 5/7] x86: remove always-defined CONFIG_AS_SSSE3

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.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 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        | 3 ---
 5 files changed, 2 insertions(+), 16 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..77457ea5a239 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -103,9 +103,7 @@ const struct raid6_recov_calls *const raid6_recov_algos[] = {
 #ifdef CONFIG_AS_AVX2
 	&raid6_recov_avx2,
 #endif
-#ifdef CONFIG_AS_SSSE3
 	&raid6_recov_ssse3,
-#endif
 #ifdef CONFIG_S390
 	&raid6_recov_s390xc,
 #endif
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 3ab8720aa2f8..79777645cac9 100644
--- a/lib/raid6/test/Makefile
+++ b/lib/raid6/test/Makefile
@@ -34,9 +34,6 @@ 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 &&	\
-                    rm ./-.o && echo -DCONFIG_AS_SSSE3=1)
         CFLAGS += $(shell echo "vpbroadcastb %xmm0, %ymm1" |	\
                     gcc -c -x assembler - >&/dev/null &&	\
                     rm ./-.o && echo -DCONFIG_AS_AVX2=1)
-- 
2.17.1