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From: Andrew Morton <akpm@osdl.org>
To: Andi Kleen <ak@muc.de>
Cc: joe.korty@ccur.com, linux-kernel@vger.kernel.org
Subject: Re: mlockall and mmap of IO devices don't mix
Date: Sat, 4 Oct 2003 00:42:46 -0700	[thread overview]
Message-ID: <20031004004246.13d1f977.akpm@osdl.org> (raw)
In-Reply-To: <m34qyp7ae4.fsf@averell.firstfloor.org>

Andi Kleen <ak@muc.de> wrote:
>
> 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().
> 

VALID_PAGE got nuked.

It still exists in vestigial form in some architectures, but x86 does not
implement it and core kernel does not use it.

It is not a trivial thing to do now we no longer have a single mem_map[].

  reply	other threads:[~2003-10-04  7:41 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
2003-10-04  7:42   ` Andrew Morton [this message]
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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