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

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Message-ID: <20200615101443.GA10075@alpha.franken.de>
Date:   Mon, 15 Jun 2020 12:14:43 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Bibo Mao <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 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.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]