[merged mm-nonmm-stable] xor-add-missing-vzeroupper-to-avx-code.patch removed from -mm tree

[merged mm-nonmm-stable] xor-add-missing-vzeroupper-to-avx-code.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: xor: add missing vzeroupper to AVX code
has been removed from the -mm tree.  Its filename was
     xor-add-missing-vzeroupper-to-avx-code.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Eric Biggers <ebiggers@kernel.org>
Subject: xor: add missing vzeroupper to AVX code
Date: Mon, 31 Aug 2026 14:22:48 -0700

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: ea4d26ae24e5 ("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>
---

 lib/raid/xor/x86/xor-avx.c |    1 +
 1 file changed, 1 insertion(+)

--- a/lib/raid/xor/x86/xor-avx.c~xor-add-missing-vzeroupper-to-avx-code
+++ a/lib/raid/xor/x86/xor-avx.c
@@ -147,6 +147,7 @@ static void xor_gen_avx(void *dest, void
 {
 	kernel_fpu_begin();
 	xor_gen_avx_inner(dest, srcs, src_cnt, bytes);
+	asm volatile("vzeroupper");
 	kernel_fpu_end();
 }
 
_

Patches currently in -mm which might be from ebiggers@kernel.org are