mm: set zone->present_pages to number of existing pages in the zone

Now all users of "number of pages managed by the buddy system" have been
converted to use zone->managed_pages, so set zone->present_pages to what
it should be:

	present_pages = spanned_pages - absent_pages;

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: Chris Clayton <chris2553@googlemail.com>
Cc: "Rafael J . Wysocki" <rjw@sisk.pl>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e59760bab13f605a516a515d3791e9ab2dad0ce5..79b9fb7ec6ca1d85a6d33c77ab4fe759cca7f1d4 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4647,7 +4647,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                nr_all_pages += freesize;
 
                zone->spanned_pages = size;
-               zone->present_pages = freesize;
+               zone->present_pages = realsize;
                /*
                 * Set an approximate value for lowmem here, it will be adjusted
                 * when the bootmem allocator frees pages into the buddy system.