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Date: Mon, 19 Nov 2001 22:06:02 -0200 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
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To: Linus Torvalds <torvalds@transmeta.com>
Cc: Rik van Riel <riel@marcelothewonderpenguin.com>,
        Marcelo Tosatti <marcelo@conectiva.com.br>,
        Simon Kirby <sim@netnation.com>, Andrea Arcangeli <andrea@suse.de>,
        lkml <linux-kernel@vger.kernel.org>
Subject: Re: VM-related Oops: 2.4.15pre1
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On Mon, 19 Nov 2001, Linus Torvalds wrote:
> On Mon, 19 Nov 2001, Rik van Riel wrote:
> >
> > Oh dear, that's an interesting case, too.
> >
> > __add_to_page_cache() blindly sets the PG_locked bit, but
> > it's possible for other functions to acquire the page lock
> > before that.
>
> No. The page is either already locked (add_to_swap_cache()), or
> exclusively owned by us..

The thing is, the "exclusively owned" situation cannot
be checked in any way, except maybe through the fact
that page->mapping==NULL ...

regards,

Rik
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