linux-kernel - Re: [patch 2/2] mm: remove task assumptions from swap token

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Date:	Tue, 16 Jun 2009 17:56:22 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <ieidus@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] mm: remove task assumptions from swap token

Johannes Weiner wrote:
> From: Hugh Dickins <hugh.dickins@...cali.co.uk>
> 
> grab_swap_token() should not make any assumptions about the running
> process as the swap token is an attribute of the address space and the
> faulting mm is not necessarily current->mm.
> 
> This fixes get_user_pages() from kernel threads which would blow up
> when encountering a swapped out page and grab_swap_token()
> dereferencing the unset for kernel threads current->mm.
> 
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Rik van Riel <riel@...hat.com>

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