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From: Russell King <rmk@arm.linux.org.uk>
To: Andi Kleen <ak@colin2.muc.de>
Cc: Ingo Oeser <ioe-lkml@rameria.de>, 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
Date: Sat, 4 Oct 2003 10:22:21 +0100 [thread overview]
Message-ID: <20031004102221.A18928@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20031004091703.GB23306@colin2.muc.de>; from ak@colin2.muc.de on Sat, Oct 04, 2003 at 11:17:03AM +0200
On Sat, Oct 04, 2003 at 11:17:03AM +0200, Andi Kleen wrote:
> > 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.
Sounds like pfn_valid() is buggy on x86. It's supposed to definitively
indicate whether the PFN is a valid page of ram (and has a valid struct
page entry.) If it doesn't do that, the architecture implementation is
wrong.
--
Russell King (rmk@arm.linux.org.uk) http://www.arm.linux.org.uk/personal/
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
next prev parent reply other threads:[~2003-10-04 9:22 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
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 [this message]
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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