ipc,shm: shorten critical region in shmctl_down

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7b1b706..0ee638f 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -56,6 +56,7 @@
 #include <linux/ftrace_event.h>
 #include <linux/memcontrol.h>
 #include <linux/prefetch.h>
+#include <linux/mm_inline.h>
 #include <linux/migrate.h>
 #include <linux/page-debug-flags.h>
 #include <linux/hugetlb.h>
@@ -488,8 +489,10 @@ __find_buddy_index(unsigned long page_idx, unsigned int order)
  * (c) a page and its buddy have the same order &&
  * (d) a page and its buddy are in the same zone.
  *
- * For recording whether a page is in the buddy system, we set ->_mapcount -2.
- * Setting, clearing, and testing _mapcount -2 is serialized by zone->lock.
+ * For recording whether a page is in the buddy system, we set ->_mapcount
+ * PAGE_BUDDY_MAPCOUNT_VALUE.
+ * Setting, clearing, and testing _mapcount PAGE_BUDDY_MAPCOUNT_VALUE is
+ * serialized by zone->lock.
  *
  * For recording page's order, we use page_private(page).
  */
@@ -527,8 +530,9 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
  * as necessary, plus some accounting needed to play nicely with other
  * parts of the VM system.
  * At each level, we keep a list of pages, which are heads of continuous
- * free pages of length of (1 << order) and marked with _mapcount -2. Page's
- * order is recorded in page_private(page) field.
+ * free pages of length of (1 << order) and marked with _mapcount
+ * PAGE_BUDDY_MAPCOUNT_VALUE. Page's order is recorded in page_private(page)
+ * field.
  * So when we are allocating or freeing one, we can derive the state of the
  * other.  That is, if we allocate a small block, and both were
  * free, the remainder of the region must be split into blocks.
@@ -647,7 +651,6 @@ static void free_pcppages_bulk(struct zone *zone, int count,
        int to_free = count;
 
        spin_lock(&zone->lock);
-       zone->all_unreclaimable = 0;
        zone->pages_scanned = 0;
 
        while (to_free) {
@@ -696,7 +699,6 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
                                int migratetype)
 {
        spin_lock(&zone->lock);
-       zone->all_unreclaimable = 0;
        zone->pages_scanned = 0;
 
        __free_one_page(page, zone, order, migratetype);
@@ -3164,7 +3166,7 @@ void show_free_areas(unsigned int filter)
                        K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
                        K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
                        zone->pages_scanned,
-                       (zone->all_unreclaimable ? "yes" : "no")
+                       (!zone_reclaimable(zone) ? "yes" : "no")
                        );
                printk("lowmem_reserve[]:");
                for (i = 0; i < MAX_NR_ZONES; i++)