linux-kernel - Re: running get_user_pages() from kernel thread

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Date:	Tue, 16 Jun 2009 17:19:01 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <ieidus@...hat.com>, linux-kernel@...r.kernel.org,
	nickpiggin@...oo.com.au
Subject: Re: running get_user_pages() from kernel thread

Hugh Dickins wrote:

> [PATCH] mm: pass mm to grab_swap_token
> 
> If a kthread happens to use get_user_pages() on an mm (as KSM does),
> there's a chance that it will end up trying to read in a swap page,
> then oops in grab_swap_token() because the kthread has no mm: GUP
> passes down the right mm, so grab_swap_token() ought to be using it.
> 
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>

Provided nobody has a problem with giving the swap token
to a task that isn't actually swapping itself ...

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

(I don't have any strong opinions either way)

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