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Date: Thu, 12 Nov 2026 14:40:36 +0100
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
Message-ID: <20261112134036.GA23216@lst.de>
References: <20261111205604.47547-1-ebiggers@kernel.org>
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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>