From e9e070cfe141e73588f1e48ca3f51d1183b8b646 Mon Sep 17 00:00:00 2001
From: Masahiro Yamada <masahiroy@kernel.org>
Date: Thu, 26 Mar 2020 17:00:59 +0900
Subject: [PATCH] x86: add comments about the binutils version to support code
in as-instr
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").
We have these as-instr tests because binutils 2.21 does not support
them.
When we bump the binutils version next time, this will be a good
hint to find out which one can be dropped.
As for the Clang/LLVM builds, we require very new LLVM version,
so the LLVM integrated assembler supports all of them.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
---
arch/x86/Kconfig.assembler | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
index 91230bf11a14a..a5a1d2766b3a8 100644
--- a/arch/x86/Kconfig.assembler
+++ b/arch/x86/Kconfig.assembler
@@ -3,15 +3,25 @@
config AS_AVX2
def_bool $(as-instr,vpbroadcastb %xmm0$(comma)%ymm1)
+ help
+ Supported by binutils >= 2.22 and LLVM integrated assembler
config AS_AVX512
def_bool $(as-instr,vpmovm2b %k1$(comma)%zmm5)
+ help
+ Supported by binutils >= 2.25 and LLVM integrated assembler
config AS_SHA1_NI
def_bool $(as-instr,sha1msg1 %xmm0$(comma)%xmm1)
+ help
+ Supported by binutils >= 2.24 and LLVM integrated assembler
config AS_SHA256_NI
def_bool $(as-instr,sha256msg1 %xmm0$(comma)%xmm1)
+ help
+ Supported by binutils >= 2.24 and LLVM integrated assembler
config AS_ADX
def_bool $(as-instr,adox %eax$(comma)%eax)
+ help
+ Supported by binutils >= 2.23 and LLVM integrated assembler
--
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