tmpfs: don't undo fallocate past its last page

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / mm / page_isolation.c

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 9d2264ea460617b6aef2b59271e61933c15fbffd..383bdbb98b04ca22726fe3d243db2ce789642975 100644 (file)
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -8,28 +8,6 @@
 #include <linux/memory.h>
 #include "internal.h"
 
-/* called while holding zone->lock */
-static void set_pageblock_isolate(struct page *page)
-{
-       if (get_pageblock_migratetype(page) == MIGRATE_ISOLATE)
-               return;
-
-       set_pageblock_migratetype(page, MIGRATE_ISOLATE);
-       page_zone(page)->nr_pageblock_isolate++;
-}
-
-/* called while holding zone->lock */
-static void restore_pageblock_isolate(struct page *page, int migratetype)
-{
-       struct zone *zone = page_zone(page);
-       if (WARN_ON(get_pageblock_migratetype(page) != MIGRATE_ISOLATE))
-               return;
-
-       BUG_ON(zone->nr_pageblock_isolate <= 0);
-       set_pageblock_migratetype(page, migratetype);
-       zone->nr_pageblock_isolate--;
-}
-
 int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages)
 {
        struct zone *zone;
@@ -80,7 +58,7 @@ out:
                unsigned long nr_pages;
                int migratetype = get_pageblock_migratetype(page);
 
-               set_pageblock_isolate(page);
+               set_pageblock_migratetype(page, MIGRATE_ISOLATE);
                nr_pages = move_freepages_block(zone, page, MIGRATE_ISOLATE);
 
                __mod_zone_freepage_state(zone, -nr_pages, migratetype);
@@ -103,7 +81,7 @@ void unset_migratetype_isolate(struct page *page, unsigned migratetype)
                goto out;
        nr_pages = move_freepages_block(zone, page, migratetype);
        __mod_zone_freepage_state(zone, nr_pages, migratetype);
-       restore_pageblock_isolate(page, migratetype);
+       set_pageblock_migratetype(page, migratetype);
 out:
        spin_unlock_irqrestore(&zone->lock, flags);
 }