[PATCH] add slab_is_available() routine for boot code

[linux-2.6] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3d84b7a35e0dcc6692b6e5bcfd4cc334c11ed604..1154684209a4458d1507702e1c4a778d942eda94 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -229,10 +229,9 @@ struct page {
                unsigned long private;          /* Mapping-private opaque data:
                                                 * usually used for buffer_heads
                                                 * if PagePrivate set; used for
-                                                * swp_entry_t if PageSwapCache.
-                                                * When page is free, this
+                                                * swp_entry_t if PageSwapCache;
                                                 * indicates order in the buddy
-                                                * system.
+                                                * system if PG_buddy is set.
                                                 */
                struct address_space *mapping;  /* If low bit clear, points to
                                                 * inode address_space, or NULL.
@@ -307,13 +306,11 @@ static inline int get_page_unless_zero(struct page *page)
        return atomic_inc_not_zero(&page->_count);
 }
 
-#define set_page_count(p,v)    atomic_set(&(p)->_count, (v))
-
 extern void FASTCALL(__page_cache_release(struct page *));
 
 static inline int page_count(struct page *page)
 {
-       if (PageCompound(page))
+       if (unlikely(PageCompound(page)))
                page = (struct page *)page_private(page);
        return atomic_read(&page->_count);
 }
@@ -325,6 +322,15 @@ static inline void get_page(struct page *page)
        atomic_inc(&page->_count);
 }
 
+/*
+ * Setup the page count before being freed into the page allocator for
+ * the first time (boot or memory hotplug)
+ */
+static inline void init_page_count(struct page *page)
+{
+       atomic_set(&page->_count, 1);
+}
+
 void put_page(struct page *page);
 
 void split_page(struct page *page, unsigned int order);