linux-kernel - Re: [PATCH] arm64: neon: Add preemption protection for kernel_neon

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Message-ID: <20180709104041.GC9486@e103592.cambridge.arm.com>
Date:   Mon, 9 Jul 2018 11:40:41 +0100
From:   Dave Martin <Dave.Martin@....com>
To:     "Yandong.Zhao" <yandong77520@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        linux-kernel@...r.kernel.org, zhaoyd@...ndersoft.com
Subject: Re: [PATCH] arm64: neon: Add preemption protection for
 kernel_neon_busy

On Mon, Jul 09, 2018 at 04:45:35PM +0800, Yandong.Zhao wrote:
> From: Yandong Zhao <yandong77520@...il.com>
> 
> may_use_simd() can be called in any case and access kernel_neon_busy,
> for example: BUG_ON(!may_use_simd()).  This patch ensures that
> migration will not occur during program access to kernel_neon_busy.
> 
> Signed-off-by: Yandong Zhao <yandong77520@...il.com>

(Duplicate patch, see [1] for discussion.)

[...]

Cheers
---Dave

[1] [PATCH] arm64: neon: Do not access kernel_neon_busy with preemption enabled                                       http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/589259.html