linux-kernel - Re: [PATCH v6 1/4] MIPS: Do not flush tlb page when updating PTE entry

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Date:   Wed, 27 May 2020 09:07:57 +0800
From:   maobibo <maobibo@...ngson.cn>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Burton <paulburton@...nel.org>,
        Dmitry Korotin <dkorotin@...ecomp.com>,
        Philippe Mathieu-Daudé <f4bug@...at.org>,
        Stafford Horne <shorne@...il.com>,
        Steven Price <steven.price@....com>,
        Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Maciej W. Rozycki" <macro@....com>, linux-mm@...ck.org,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v6 1/4] MIPS: Do not flush tlb page when updating PTE
 entry



On 05/25/2020 04:31 PM, Sergei Shtylyov wrote:
> On 25.05.2020 11:12, Sergei Shtylyov wrote:
> 
>>> It is not necessary to flush tlb page on all CPUs if suitable PTE
>>> entry exists already during page fault handling, just updating
>>> TLB is fine.
>>>
>>> Here redefine flush_tlb_fix_spurious_fault as empty on MIPS system.
>>
>>     Need empty line here.
>>
>>> V6:
>>> - Add update_mmu_tlb function as empty on all platform except mips
>>>    system, we use this function to update local tlb for page fault
>>>    smp-race handling
>>> V5:
>>> - define update_mmu_cache function specified on MIPS platform, and
>>>    add page fault smp-race stats info
>>> V4:
>>> - add pte_sw_mkyoung function to implement readable privilege, and
>>>    this function is  only in effect on MIPS system.
>>> - add page valid bit judgement in function pte_modify
>>> V3:
>>> - add detailed changelog, modify typo issue in patch V2
>>> v2:
>>> - split flush_tlb_fix_spurious_fault and tlb update into two patches
>>> - comments typo modification
>>> - separate tlb update and add pte readable privilege into two patches
>>
>>    It was a bad idea to keep the version change log in the 1st patch only,
>> we have either cover letter for that, or all the individual patches...
> 
>    Sorry for noticing this only now. With 4 patches, you should have a cover letter anyway...
Thanks for reviewing my patch, a cover letter will be added.

> 

>>> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
>> [...]
> 
> MBR, Sergei