On Fri 16-06-17 17:23:34, Wei Yang wrote:
> To make sure a range intersects a zone, only two comparison is necessary.
>
> This patch simplifies the function a little.
>
> Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> include/linux/mmzone.h | 10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 0176a2933c61..7e8f100cb56d 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -541,15 +541,11 @@ static inline bool zone_intersects(struct zone *zone,
> {
> if (zone_is_empty(zone))
> return false;
> - if (start_pfn >= zone_end_pfn(zone))
> + if (start_pfn >= zone_end_pfn(zone) ||
> + start_pfn + nr_pages <= zone->zone_start_pfn)
> return false;
>
> - if (zone->zone_start_pfn <= start_pfn)
> - return true;
> - if (start_pfn + nr_pages > zone->zone_start_pfn)
> - return true;
> -
> - return false;
> + return true;
> }
>
> /*
> --
> 2.11.0
--
Michal Hocko
SUSE Labs
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