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

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Message-ID: <5386F663.4010401@huawei.com>
Date:	Thu, 29 May 2014 16:57:07 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Aaro Koskinen <aaro.koskinen@....fi>
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

On 2014/5/29 4:09, Aaro Koskinen wrote:
> 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.
> 

I don't think Ralf has committed it, so we'll send out a fix
with detailed changelog.

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