linux-kernel - Re: dio_get_page() lockdep complaints

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Date:	Mon, 12 Nov 2007 10:27:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	schwidefsky@...ibm.com
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Zach Brown <zach.brown@...cle.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-aio@...ck.org, Chris Mason <chris.mason@...cle.com>,
	linux-mm <linux-mm@...ck.org>, Hugh Dickins <hugh@...itas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: dio_get_page() lockdep complaints


On Mon, 2007-11-12 at 09:45 +0100, Martin Schwidefsky wrote:
> On Sun, 2007-11-11 at 20:49 +0100, Peter Zijlstra wrote:
> > Right, which gets us into all kinds of trouble because some sites need
> > mmap_sem to resolve some races, notably s390 31-bit and shm.
> 
> You are refering to the mmap_sem use in compat_linux.c:do_mmap2, aren't
> you? That check for adresses > 2GB after the call to do_mmap_pgoff can
> be removed since arch_get_unmapped_area already checks against
> TASK_SIZE. The result of the do_mmap_pgoff call will never be out of
> range. This check is a left-over from the early days of the s390 compat
> code.

Correct, that is the one I was referring to. Thanks for the explanation,
I'll clean it up when I take this patch forward.



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