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authorMasahiro Yamada <masahiroy@kernel.org>2020-03-26 11:00:59 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2020-04-08 18:01:59 +0300
commite9e070cfe141e73588f1e48ca3f51d1183b8b646 (patch)
tree3bcf70b84a3989a41833873be6341aa931dc94e2 /arch/x86/Kconfig.assembler
parent5e8ebd841a44b895e2bab5e874ff7d333ca31135 (diff)
downloadlinux-e9e070cfe141e73588f1e48ca3f51d1183b8b646.tar.xz
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/x86/Kconfig.assembler')
-rw-r--r--arch/x86/Kconfig.assembler10
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