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

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Date:   Mon, 25 May 2020 11:12:25 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Bibo Mao <maobibo@...ngson.cn>,
        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

Hello!

On 25.05.2020 5:52, Bibo Mao 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...

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

MBR, Sergei