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Date: Fri, 27 Sep 2002 19:42:33 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andrew Morton <akpm@zip.com.au>, Rusty Russell <rusty@rustcorp.com.au>,
       <linux-kernel@vger.kernel.org>
Subject: Re: [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8
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i'd love to do this, but:

> 	spin_lock(&futex_lock);
> 
> >         q.page = NULL;
> >         attach_vcache(&q.vcache, uaddr, current->mm, futex_vcache_callback);
> > 
> >         page = pin_page(uaddr - offset);

            [ LOCKUP ]

pin_page() calls get_user_pages(), which might block in handle_mm_fault().

	Ingo

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