linux-kernel - Re: pte_offset_map for ppc assumes HIGHPTE

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Date:	Wed, 25 Jul 2007 18:30:21 -0500
From:	Dave McCracken <dave.mccracken@...cle.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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 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.

Dave McCracken
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