linux-kernel - Re: [PATCH] ARM: map_init_section flushes incorrect pmd

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Message-ID: <CANutaR_8jNDzPeyJ8PLZPS=yiZ8Ywmk08dR9vLcB2CpxuJac3A@mail.gmail.com>
Date:	Wed, 29 May 2013 17:34:01 +0800
From:	Po-Yu Chuang <ratbert.chuang@...il.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Sricharan R <r.sricharan@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"nico@...aro.org" <nico@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: map_init_section flushes incorrect pmd

Hi Will,

On Wed, May 29, 2013 at 4:54 PM, Will Deacon <will.deacon@....com> wrote:
> On Wed, May 29, 2013 at 03:14:58AM +0100, Po-Yu Chuang wrote:
>> Will,
>> I guess nobody noticed this because the MMU of later v7 processors
>> fetches page table
>> from D-cache. It even doesn't need to clean pmd to PoU.
>
> It does if it's UP. The walker is only guaranteed to read from L1 if you
> have the multiprocessing extensions.

Ya, I see.

>
> As for this function, looks like it's ok because it has precisely one
> caller, so it might be worth prefixing it with some underscores to make it
> clear that nobody else should be calling it!

I am fine with that.
Should I create a new patch?

Regards,
Po-Yu
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