---

yaml --- r: 198258 b: refs/heads/master c: 142762b h: refs/heads/master v: v3
git-mirror · May 25, 2010 · 072449e · 072449e
1 parent 6230bf0
commit 072449e
Show file tree

Hide file tree

Showing 2 changed files with 12 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 58a9d3d8db06ca2ec31f64ec49ab0aeb89971b85
+refs/heads/master: 142762bd8d8c46345e79f0f68d3374564306972f
diff --git a/trunk/mm/memory.c b/trunk/mm/memory.c
@@ -1227,8 +1227,17 @@ int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
 }
 EXPORT_SYMBOL_GPL(zap_vma_ptes);
 
-/*
- * Do a quick page-table lookup for a single page.
+/**
+ * follow_page - look up a page descriptor from a user-virtual address
+ * @vma: vm_area_struct mapping @address
+ * @address: virtual address to look up
+ * @flags: flags modifying lookup behaviour
+ *
+ * @flags can have FOLL_ flags set, defined in <linux/mm.h>
+ *
+ * Returns the mapped (struct page *), %NULL if no mapping exists, or
+ * an error pointer if there is a mapping to something not represented
+ * by a page descriptor (see also vm_normal_page()).
  */
 struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
 			unsigned int flags)