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

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Date:   Wed, 17 Jun 2020 13:14:03 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     maobibo <maobibo@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Do not flush tlb when setting pmd entry

On Tue, Jun 16, 2020 at 06:34:21PM +0800, maobibo wrote:
> 
> 
> 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.

I was more concerned about

fs/dax.c
fs/proc/task_mmu.c
mm/rmap.c

Thomas.

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