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From: "David S. Miller" <davem@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: joe.korty@ccur.com, linux-kernel@vger.kernel.org,
	riel@redhat.com, andrea@suse.de
Subject: Re: mlockall and mmap of IO devices don't mix
Date: Fri, 3 Oct 2003 22:47:27 -0700	[thread overview]
Message-ID: <20031003224727.2f6956b5.davem@redhat.com> (raw)
In-Reply-To: <20031003172727.3d2b6cb2.akpm@osdl.org>

On Fri, 3 Oct 2003 17:27:27 -0700
Andrew Morton <akpm@osdl.org> wrote:

> Maybe it's best to not overload VM_RESERVED in this manner, but to always
> mark /dev/mem as VM_IO. 

Just in cast is isn't clear, it should be defined that anything
that sets VM_IO on an mmap() area should prefill the page tables
as a side effect of such a mmap() request.

Then things like mlockall() have simple semantics on VM_IO area, they
end up being a nop.

  reply	other threads:[~2003-10-04  5:47 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]
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
     [not found] <CFYv.787.23@gated-at.bofh.it>
2003-10-04  7:02 ` Andi Kleen
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

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