linux-kernel - Re: [PATCH] MIPS: Do not flush tlb when setting pmd entry

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Message-ID: <4bef403d-baba-ddf8-c25c-3d6968897a53@loongson.cn>
Date:   Tue, 16 Jun 2020 18:34:21 +0800
From:   maobibo <maobibo@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Do not flush tlb when setting pmd entry



On 06/15/2020 06:14 PM, Thomas Bogendoerfer wrote:
> On Wed, Jun 03, 2020 at 05:42:13PM +0800, Bibo Mao wrote:
>> Function set_pmd_at is to set pmd entry, if tlb entry need to
>> be flushed, there exists pmdp_huge_clear_flush alike function
>> before set_pmd_at is called. So it is not necessary to call
>> flush_tlb_all in this function.
> 
> have you checked all set_pmd_at() calls ? I found a few case where
> it's not clear to me, if tlb flushing is done... If you think this
> is still the right thing to do, please change arch/mips/mm/pgtable-32.c
> as well.
well, I will double check this and do more testing about thp and hugepage.

regards
bibo,mao
> 
> Thomas.
>