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[].
next prev parent reply other threads:[~2003-10-04 7:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CFYv.787.23@gated-at.bofh.it>
2003-10-04 7:02 ` mlockall and mmap of IO devices don't mix 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 14:19 ` 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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