linux-kernel - Re: [RFT PATCH v2 1/4] arm64: fix possible invalid FPSIMD initialization state

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Message-ID: <525BF88C.4070608@gmail.com>
Date:	Mon, 14 Oct 2013 21:58:36 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Catalin Marinas <catalin.marinas@....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 v2 1/4] arm64: fix possible invalid FPSIMD initialization
 state

On 10/14/2013 09:54 PM, Catalin Marinas wrote:
> On Sun, Oct 13, 2013 at 03:20:17PM +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().
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>> Cc: Jiang Liu <liuj97@...il.com>
> 
> That's already in mainline (3.12-rc4).
> 

Hi Catalin,
	I haven't noticed that yet, sorry for the noise:)
Thanks!
Gerry
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