linux-kernel - Re: [PATCH V2] MIPS: change type of asid

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Message-ID: <20140528200929.GA30528@drone.musicnaut.iki.fi>
Date:	Wed, 28 May 2014 23:09:29 +0300
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Yong Zhang <yong.zhang@...driver.com>, ralf@...ux-mips.org,
	huawei.libin@...wei.com, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, Xinwei Hu <huxinwei@...wei.com>
Subject: Re: [PATCH V2] MIPS: change type of asid_cache to unsigned long

Hi,

On Tue, May 27, 2014 at 12:16:30PM +0800, Li Zefan wrote:
> On 2014/5/21 13:36, Yong Zhang wrote:
> > asid_cache must be unsigned long otherwise on 64bit system
> > it will become 0 if the value in get_new_mmu_context()
> > reaches 0xffffffff and in the end the assumption of
> > ASID_FIRST_VERSION is not true anymore thus leads to
> > more dangerous things.
> 
> We should describe what problem this bug can lead to, which
> will help people who encounter the same problem and google it.

Please describe it, then. Even if the patch is already committed,
googling would probably still find this e-mail thread.

Thanks,

A.
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