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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-26 09:00:59 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-04-08 17:01:59 +0200 |
| commit | e9e070cfe141e73588f1e48ca3f51d1183b8b646 (patch) | |
| tree | 3bcf70b84a3989a41833873be6341aa931dc94e2 /arch | |
| parent | x86: probe assembler capabilities via kconfig instead of makefile (diff) | |
| download | linux-e9e070cfe141e73588f1e48ca3f51d1183b8b646.tar.xz linux-e9e070cfe141e73588f1e48ca3f51d1183b8b646.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig.assembler | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler index 91230bf11a14..a5a1d2766b3a 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 |