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From: Andi Kleen <ak@muc.de>
To: Joe Korty <joe.korty@ccur.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mlockall and mmap of IO devices don't mix
Date: Sat, 04 Oct 2003 09:02:59 +0200	[thread overview]
Message-ID: <m34qyp7ae4.fsf@averell.firstfloor.org> (raw)
In-Reply-To: <CFYv.787.23@gated-at.bofh.it> (Joe Korty's message of "Fri, 03 Oct 2003 23:50:19 +0200")

Joe Korty <joe.korty@ccur.com> writes:

>  
> I do not believe that the above constitutes a correct fix.  The
> problem is that follow_pages() is fundamentally not able to handle a
> mapping which does not have a 'struct page' backing it up, and a
> mapping to IO memory by definition has no 'struct page' structure to
> back it up.

The 2.4 vm scanner handles this by always checking VALID_PAGE().

Maybe follow_pages() should do that too?

-Andi

       reply	other threads:[~2003-10-04  7:03 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CFYv.787.23@gated-at.bofh.it>
2003-10-04  7:02 ` Andi Kleen [this message]
2003-10-04  7:42   ` Andrew Morton
2003-10-04  8:29     ` Andi Kleen
2003-10-04  8:47   ` Ingo Oeser
2003-10-04  9:17     ` Andi Kleen
2003-10-04  9:22       ` Russell King
2003-10-04 10:02         ` Ingo Oeser
2003-10-04 10:13           ` Russell King
2003-10-04 14:19             ` Ingo Oeser
2003-10-04 14:32           ` Martin J. Bligh
2003-10-03 21:44 Joe Korty
2003-10-03 22:23 ` Andrew Morton
2003-10-03 22:55   ` Joe Korty
2003-10-03 23:06     ` Andrew Morton
2003-10-03 23:28       ` Joe Korty
2003-10-03 23:15     ` Andrew Morton
2003-10-03 23:54       ` Joe Korty
2003-10-04  0:27         ` Andrew Morton
2003-10-04  5:47           ` David S. Miller
2003-10-04  9:29             ` Ingo Oeser
2004-05-21 11:34 ` Mark Hounschell
2004-05-22  2:13   ` Andrew Morton
2004-05-22 10:47     ` Mark Hounschell
2004-05-23 12:58       ` Mark Hounschell
2004-05-25 14:27     ` Joe Korty
2004-05-25 19:47       ` Andrew Morton
2004-05-25 21:31         ` Joe Korty
2004-07-16 21:01         ` Mark Hounschell

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