---

yaml
---
r: 143213
b: refs/heads/master
c: 9de100d
h: refs/heads/master
i:
  143211: 79d7a67
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d20d5a7456d57d8affa88f45f27ae96ea49c29e4
+refs/heads/master: 9de100d001564f58c3fb2ec1bd03e540ac0aa357

trunk/mm/util.c

@@ -223,6 +223,22 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 }
 #endif
 
+/**
+ * get_user_pages_fast() - pin user pages in memory
+ * @start:	starting user address
+ * @nr_pages:	number of pages from start to pin
+ * @write:	whether pages will be written to
+ * @pages:	array that receives pointers to the pages pinned.
+ *		Should be at least nr_pages long.
+ *
+ * Attempt to pin user pages in memory without taking mm->mmap_sem.
+ * If not successful, it will fall back to taking the lock and
+ * calling get_user_pages().
+ *
+ * Returns number of pages pinned. This may be fewer than the number
+ * requested. If nr_pages is 0 or negative, returns 0. If no pages
+ * were pinned, returns -errno.
+ */
 int __attribute__((weak)) get_user_pages_fast(unsigned long start,
 				int nr_pages, int write, struct page **pages)
 {