On Tue 16-08-16 17:00:43, Bart Van Assche wrote:
> If a fatal signal has been received, fail immediately instead of
> trying to read more data.
>
> See also commit ebded02788b5 ("mm: filemap: avoid unnecessary
> calls to lock_page when waiting for IO to complete during a read")
>
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Cc: Jan Kara <jack@xxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
If not anything else it makes code more readable because the real error
is hidden in page_not_up_to_date: currently...
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> mm/filemap.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 2a9e84f6..bd8ab63 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -1721,7 +1721,9 @@ find_page:
> * wait_on_page_locked is used to avoid unnecessarily
> * serialisations and why it's safe.
> */
> - wait_on_page_locked_killable(page);
> + error = wait_on_page_locked_killable(page);
> + if (unlikely(error))
> + goto readpage_error;
> if (PageUptodate(page))
> goto page_ok;
>
> --
> 2.9.2
>
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--
Michal Hocko
SUSE Labs
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