[PATCH] libata-ncq: add NCQ related ATA/libata constants and macros

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

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7d8c127daad725a4e969f56c662c1aae2ef84d96..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.
@@ -311,7 +310,7 @@ 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);
 }