linux-kernel - Re: [RFT PATCH v1 1/7] arm64: fix possible invalid FPSIMD initialization state

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Message-ID: <20130927105957.GB11063@MacBook-Pro.local>
Date:	Fri, 27 Sep 2013 11:59:58 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFT PATCH v1 1/7] arm64: fix possible invalid FPSIMD
 initialization state

On Fri, Sep 27, 2013 at 09:04:41AM +0100, Jiang Liu wrote:
> From: Jiang Liu <jiang.liu@...wei.com>
> 
> If context switching happens during executing fpsimd_flush_thread(),
> stale value in FPSIMD registers will be saved into current thread's
> fpsimd_state by fpsimd_thread_switch(). That may cause invalid
> initialization state for the new process, so disable preemption
> when executing fpsimd_flush_thread().

Good catch.

-- 
Catalin
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