linux-kernel - Re: [PATCH 3/5] crypto/arm64: sm4-ce-gcm - Avoid pointless yield of the NEON unit

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Message-ID: <4eb3c865-75af-43e4-a760-46bbb7e34f9b@sirena.org.uk>
Date: Fri, 19 Sep 2025 17:03:30 +0100
From: Mark Brown <broonie@...nel.org>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au,
	ebiggers@...nel.org, Ard Biesheuvel <ardb@...nel.org>,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Kees Cook <keescook@...omium.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 3/5] crypto/arm64: sm4-ce-gcm - Avoid pointless yield of
 the NEON unit

On Thu, Sep 18, 2025 at 08:35:43AM +0200, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
> 
> Kernel mode NEON sections are now preemptible on arm64, and so there is
> no need to yield it when calling APIs that may sleep.
> 
> Also, move the calls to kernel_neon_end() to the same scope as
> kernel_neon_begin(). This is needed for a subsequent change where a
> stack buffer is allocated transparently and passed to
> kernel_neon_begin().

Reviewed-by: Mark Brown <broonie@...nel.org>

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