Re: running get_user_pages() from kernel thread
From: Rik van Riel
Date: Tue Jun 16 2009 - 17:19:20 EST
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@xxxxxxxxxxxxx>
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@xxxxxxxxxx>
(I don't have any strong opinions either way)
All rights reversed.
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