linux-kernel - Re: [PATCH] Revert "MIPS: make userspace mapping young by default".

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Date:   Sat, 24 Apr 2021 19:24:21 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Huang Pei <huangpei@...ngson.cn>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        paul.burton@...s.com, paul@...pouillou.net, siyanteng@...ngson.cn,
        ira.weiny@...el.com, yangtiezhu@...ngson.cn, jun.jiang@...enic.com,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, sernia.zhou@...mail.com,
        sihui.liu@...enic.com
Subject: Re: [PATCH] Revert "MIPS: make userspace mapping young by default".

Hi Thomas,

On 2021/4/23 下午10:51, Thomas Bogendoerfer wrote:
> On Tue, Apr 20, 2021 at 10:03:01PM +0800, Zhou Yanjie wrote:
>> Sorry for my carelessness, the log in the previous email was wrong, please
>> check the log in this email.
>>
>> [   53.684067] --- pte 1 = 07698685
> any chance to print the virtual address to this pte ?
>
>> [   53.687376] --- pte 3 = 07698685
>> [   53.737175] --- pte 1 = 07699685
>> [   53.740412] --- pte 3 = 07699685
>> [   53.744064] --- pte 1 = 076c3685
>> [..]
> could you print PTE, which faults ? And what is mapped there ?
>
>
> so far I haven't seen any ill-effects of the (bisected ?) patch.
> The problem I have with reverting is that IMHO we re-introduce the bug,
> which this patch fixed.


Fortunately, Mr. Huang Pei and I are in the same city. We have done 
off-line communication, and he is very generous to help troubleshoot the 
problem.


Thanks and best regards!


>
> Thomas.
>