linux-kernel - Re: [PATCH] arm64: kernel thread don't need to save fpsimd context.

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Message-ID: <20150611144042.GB29305@e104818-lin.cambridge.arm.com>
Date:	Thu, 11 Jun 2015 15:40:43 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Chunyan Zhang <chunyan.zhang@...eadtrum.com>
Cc:	will.deacon@....com, janet.liu@...eadtrum.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	xiongshan.an@...eadtrum.com
Subject: Re: [PATCH] arm64: kernel thread don't need to save fpsimd context.

On Thu, Jun 11, 2015 at 12:04:32PM +0800, Chunyan Zhang wrote:
> From: Janet Liu <janet.liu@...eadtrum.com>
> 
> kernel thread's default fpsimd state is zero. When fork a thread, if parent is kernel thread,
>  and save hardware context to parent's fpsimd state, but this hardware context is user
> process's context, because kernel thread don't use fpsimd, it will not introduce issue,
> it add a little cost.
> 
> Signed-off-by: Janet Liu <janet.liu@...eadtrum.com>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...eadtrum.com>

Applied. Thanks.

-- 
Catalin
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