1 files changed, 39 insertions, 14 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a6b17aa4740b..a8182c89de59 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -76,6 +76,31 @@ unsigned long totalreserve_pages __read_mostly;
 int percpu_pagelist_fraction;
 gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
 
+#ifdef CONFIG_PM_SLEEP
+/*
+ * The following functions are used by the suspend/hibernate code to temporarily
+ * change gfp_allowed_mask in order to avoid using I/O during memory allocations
+ * while devices are suspended.  To avoid races with the suspend/hibernate code,
+ * they should always be called with pm_mutex held (gfp_allowed_mask also should
+ * only be modified with pm_mutex held, unless the suspend/hibernate code is
+ * guaranteed not to run in parallel with that modification).
+ */
+void set_gfp_allowed_mask(gfp_t mask)
+{
+        WARN_ON(!mutex_is_locked(&pm_mutex));
+        gfp_allowed_mask = mask;
+}
+
+gfp_t clear_gfp_allowed_mask(gfp_t mask)
+{
+        gfp_t ret = gfp_allowed_mask;
+
+        WARN_ON(!mutex_is_locked(&pm_mutex));
+        gfp_allowed_mask &= ~mask;
+        return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
 #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
 int pageblock_order __read_mostly;
 #endif
@@ -530,7 +555,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
         int batch_free = 0;
 
         spin_lock(&zone->lock);
-        zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE);
+        zone->all_unreclaimable = 0;
         zone->pages_scanned = 0;
 
         __mod_zone_page_state(zone, NR_FREE_PAGES, count);
@@ -568,7 +593,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
                                 int migratetype)
 {
         spin_lock(&zone->lock);
-        zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE);
+        zone->all_unreclaimable = 0;
         zone->pages_scanned = 0;
 
         __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
@@ -583,6 +608,7 @@ static void __free_pages_ok(struct page *page, unsigned int order)
         int bad = 0;
         int wasMlocked = __TestClearPageMlocked(page);
 
+        trace_mm_page_free_direct(page, order);
         kmemcheck_free_shadow(page, order);
 
         for (i = 0 ; i < (1 << order) ; ++i)
@@ -1073,8 +1099,9 @@ void mark_free_pages(struct zone *zone)
 
 /*
  * Free a 0-order page
+ * cold == 1 ? free a cold page : free a hot page
  */
-static void free_hot_cold_page(struct page *page, int cold)
+void free_hot_cold_page(struct page *page, int cold)
 {
         struct zone *zone = page_zone(page);
         struct per_cpu_pages *pcp;
@@ -1082,6 +1109,7 @@ static void free_hot_cold_page(struct page *page, int cold)
         int migratetype;
         int wasMlocked = __TestClearPageMlocked(page);
 
+        trace_mm_page_free_direct(page, 0);
         kmemcheck_free_shadow(page, 0);
 
         if (PageAnon(page))
@@ -1133,12 +1161,6 @@ out:
         local_irq_restore(flags);
 }
 
-void free_hot_page(struct page *page)
-{
-        trace_mm_page_free_direct(page, 0);
-        free_hot_cold_page(page, 0);
-}
-        
 /*
  * split_page takes a non-compound higher-order page, and splits it into
  * n (1<<order) sub-pages: page[0..n]
@@ -2008,9 +2030,8 @@ void __pagevec_free(struct pagevec *pvec)
 void __free_pages(struct page *page, unsigned int order)
 {
         if (put_page_testzero(page)) {
-                trace_mm_page_free_direct(page, order);
                 if (order == 0)
-                        free_hot_page(page);
+                        free_hot_cold_page(page, 0);
                 else
                         __free_pages_ok(page, order);
         }
@@ -2266,7 +2287,7 @@ void show_free_areas(void)
                         K(zone_page_state(zone, NR_BOUNCE)),
                         K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
                         zone->pages_scanned,
-                        (zone_is_all_unreclaimable(zone) ? "yes" : "no")
+                        (zone->all_unreclaimable ? "yes" : "no")
                         );
                 printk("lowmem_reserve[]:");
                 for (i = 0; i < MAX_NR_ZONES; i++)
@@ -4371,8 +4392,12 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
         for (i = 0; i < MAX_NR_ZONES; i++) {
                 if (i == ZONE_MOVABLE)
                         continue;
-                printk("  %-8s %0#10lx -> %0#10lx\n",
-                                zone_names[i],
+                printk("  %-8s ", zone_names[i]);
+                if (arch_zone_lowest_possible_pfn[i] ==
+                                arch_zone_highest_possible_pfn[i])
+                        printk("empty\n");
+                else
+                        printk("%0#10lx -> %0#10lx\n",
                                 arch_zone_lowest_possible_pfn[i],
                                 arch_zone_highest_possible_pfn[i]);
         }