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

From: Rik van Riel
Date: Tue Jun 16 2009 - 17:57:13 EST

Johannes Weiner wrote:
From: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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