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)

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