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| author | Peter Zijlstra <peterz@infradead.org> | 2025-10-27 12:40:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-13 15:36:38 -0500 |
| commit | 8c1a0f8f6121dabddbc89f937285c00b0e44ae05 (patch) | |
| tree | 121c9861bcd8fa816939ff0d93982d2b087b9c3a /arch | |
| parent | b556c278d43f4707a9073ca74d55581b4f279806 (diff) | |
| download | linux-8c1a0f8f6121dabddbc89f937285c00b0e44ae05.tar.gz linux-8c1a0f8f6121dabddbc89f937285c00b0e44ae05.tar.bz2 linux-8c1a0f8f6121dabddbc89f937285c00b0e44ae05.zip | |
x86/build: Disable SSE4a
commit 0d6e9ec80cebf9b378a1d3a01144e576d731c397 upstream.
Leyvi Rose reported that his X86_NATIVE_CPU=y build is failing because our
instruction decoder doesn't support SSE4a and the AMDGPU code seems to be
generating those with his compiler of choice (CLANG+LTO).
Now, our normal build flags disable SSE MMX SSE2 3DNOW AVX, but then
CC_FLAGS_FPU re-enable SSE SSE2.
Since nothing mentions SSE3 or SSE4, I'm assuming that -msse (or its negative)
control all SSE variants -- but why then explicitly enumerate SSE2 ?
Anyway, until the instruction decoder gets fixed, explicitly disallow SSE4a
(an AMD specific SSE4 extension).
Fixes: ea1dcca1de12 ("x86/kbuild/64: Add the CONFIG_X86_NATIVE_CPU option to locally optimize the kernel with '-march=native'")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Arisu Tachibana <arisu.tachibana@miraclelinux.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Cc: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1913d342969b..9c32f588d451 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -74,7 +74,7 @@ export BITS # # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 # -KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx +KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -mno-sse4a KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2 |