From: Christoph Hellwig <hch@lst.de>
To: Eric Biggers <ebiggers@kernel.org>
Cc: akpm@linux-foundation.org, linux-raid@vger.kernel.org,
linux-crypto@vger.kernel.org, x86@kernel.org,
Christoph Hellwig <hch@lst.de>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>
Subject: Re: [PATCH 0/3] lib/raid: opt out of initializing MXCSR and 387 state
Date: Thu, 12 Nov 2026 14:40:36 +0100 [thread overview]
Message-ID: <20261112134036.GA23216@lst.de> (raw)
In-Reply-To: <20261111205604.47547-1-ebiggers@kernel.org>
On Wed, Nov 11, 2026 at 12:56:01PM -0800, Eric Biggers wrote:
> This series slightly reduces the overhead of the x86 kernel-mode "FPU"
> sections in the RAID code by using kernel_fpu_begin_mask(0) instead of
> kernel_fpu_begin(), thus opting out of the 'ldmxcsr' (and on 32-bit
> kernels, also 'fninit'). MXCSR is irrelevant for integer code.
Maybe we really want a kernel_avx_{begin,end} after all :)
I'd still prefer that, but in the meantime the change looks fine:
Reviewed-by: Christoph Hellwig <hch@lst.de>
prev parent reply other threads:[~2026-11-12 13:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 20:56 [PATCH 0/3] lib/raid: opt out of initializing MXCSR and 387 state Eric Biggers
2026-11-11 20:56 ` [PATCH 1/3] um: Define kernel_fpu_begin_mask() Eric Biggers
2026-11-12 7:28 ` Johannes Berg
2026-11-11 20:56 ` [PATCH 2/3] xor: opt out of initializing MXCSR and 387 state Eric Biggers
2026-11-11 20:56 ` [PATCH 3/3] raid6: " Eric Biggers
2026-11-12 13:40 ` Christoph Hellwig [this message]
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