linux-kernel - Re: pte_offset_map for ppc assumes HIGHPTE

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Message-Id: <1185409094.5495.0.camel@localhost.localdomain>
Date:	Thu, 26 Jul 2007 10:18:13 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Dave McCracken <dave.mccracken@...cle.com>
Cc:	Andreas Schwab <schwab@...e.de>, Satya <satyakiran@...il.com>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: pte_offset_map for ppc assumes HIGHPTE

On Wed, 2007-07-25 at 18:30 -0500, Dave McCracken wrote:
> On Wednesday 25 July 2007, Benjamin Herrenschmidt wrote:
> > Depends... if you have CONFIG_HIGHMEM and not CONFIG_HIGHPTE, you are
> > wasting time going through kmap_atomic unnecessarily no ? it will probably
> > not do anything because the PTE page is in lowmem but still...
> 
> Probably not much time.  You still need to do the page to virtual translation, 
> which kmap_atomic does for you.

Fair enough.

Ben.


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