mm: fix return type for functions nr_free_*_pages
Currently, the amount of RAM that functions nr_free_*_pages return is
held in unsigned int. But in machines with big memory (exceeding 16TB),
the amount may be incorrect because of overflow, so fix it.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 159f815..2761406 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2813,13 +2813,13 @@
}
EXPORT_SYMBOL(free_pages_exact);
-static unsigned int nr_free_zone_pages(int offset)
+static unsigned long nr_free_zone_pages(int offset)
{
struct zoneref *z;
struct zone *zone;
/* Just pick one node, since fallback list is circular */
- unsigned int sum = 0;
+ unsigned long sum = 0;
struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL);
@@ -2836,7 +2836,7 @@
/*
* Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
*/
-unsigned int nr_free_buffer_pages(void)
+unsigned long nr_free_buffer_pages(void)
{
return nr_free_zone_pages(gfp_zone(GFP_USER));
}
@@ -2845,7 +2845,7 @@
/*
* Amount of free RAM allocatable within all zones
*/
-unsigned int nr_free_pagecache_pages(void)
+unsigned long nr_free_pagecache_pages(void)
{
return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE));
}