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Date: Wed, 2 Sep 2026 15:37:06 +0200
From: Christoph Hellwig <hch@lst.de>
To: Eric Biggers <ebiggers@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-raid@vger.kernel.org,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	Christoph Hellwig <hch@lst.de>, stable@vger.kernel.org
Subject: Re: [PATCH RESEND] xor: add missing vzeroupper to AVX code
Message-ID: <20260902133706.GA21538@lst.de>
References: <20260831212248.213805-1-ebiggers@kernel.org>
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On Mon, Aug 31, 2026 at 02:22:48PM -0700, Eric Biggers wrote:
> 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.
> 
> Fixes: ea4d26ae24e5 ("raid5: add AVX optimized RAID5 checksumming")
> Cc: stable@vger.kernel.org
> Signed-off-by: Eric Biggers <ebiggers@kernel.org>
> ---
> 
> This didn't get taken through the x86 tree.  Andrew, it seems you're
> taking patches to lib/raid/.  Can you apply this one?

Can we do kernel_avx_{begin,end} instead of having to open code
and document this everywhere, please?