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Date: 4 Oct 2003 11:17:03 +0200
Date: Sat, 4 Oct 2003 11:17:03 +0200
From: Andi Kleen <ak@colin2.muc.de>
To: Ingo Oeser <ioe-lkml@rameria.de>
Cc: Andi Kleen <ak@muc.de>, Joe Korty <joe.korty@ccur.com>,
       linux-kernel@vger.kernel.org
Subject: Re: mlockall and mmap of IO devices don't mix
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References: <CFYv.787.23@gated-at.bofh.it> <m34qyp7ae4.fsf@averell.firstfloor.org> <200310041047.56705.ioe-lkml@rameria.de>
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> This check is only done, if it is a valid pfn (pfn_valid()) of a present
> pte.

pfn_valid is useless, it doesn't handle all IO holes on x86 for examples.

-Andi