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xor: add missing vzeroupper to AVX code

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Since the AVX optimized XOR code uses YMM registers, execute vzeroupper
before returning from it.  This is needed to avoid degrading the
performance of any later SSE code that may happen to be executed.

Link: https://lore.kernel.org/20260831212248.213805-1-ebiggers@kernel.org
Fixes: ea4d26ae24 ("raid5: add AVX optimized RAID5 checksumming")
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Eric Biggers 2026-08-31 14:22:48 -07:00 committed by Andrew Morton
parent a4747846df
commit 7b8fc26c40
1 changed files with 1 additions and 0 deletions
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lib/raid/xor/x86/xor-avx.c
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@ -147,6 +147,7 @@ static void xor_gen_avx(void *dest, void **srcs, unsigned int src_cnt,
{
kernel_fpu_begin();
xor_gen_avx_inner(dest, srcs, src_cnt, bytes);
asm volatile("vzeroupper");
kernel_fpu_end();
}