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

[Rik van Riel]

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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