linux-kernel - Re: kmap_atomic_pfn for PCI BAR access?

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Message-ID: <48633057.1040106@goop.org>
Date:	Wed, 25 Jun 2008 22:59:51 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Keith Packard <keithp@...thp.com>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Dave Airlie <airlied@...il.com>,
	Dave Airlie <airlied@...ux.ie>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: kmap_atomic_pfn for PCI BAR access?

Keith Packard wrote:
> On Wed, 2008-06-25 at 21:36 -0700, Arjan van de Ven wrote:
>
>   
>> well kmap does a tlb flush as well... 
>>     
>
> kmap_atomic
>   

Anything that does any kind of pagetable manipulation needs to do tlb 
flushes.  kunmap_atomic handles the flushing.

    J
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