From 6a4327abe7f8a2784db2103eab4ecba4d00c428b Mon Sep 17 00:00:00 2001
From: Andy Grover <andy.grover@oracle.com>
Date: Thu, 9 Apr 2009 16:45:29 -0700
Subject: [PATCH] --- yaml --- r: 143121 b: refs/heads/master c:
 a0d22f485af1553060b4094ee0154537a8f6a8a6 h: refs/heads/master i:   143119:
 fd4c5f9b82a585759e46e486339beef92e5d02ba v: v3

---
 [refs]                  |  2 +-
 trunk/arch/x86/mm/gup.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 75eaa9a4b885..56895dbb82c2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 746cddd37d48a166f170165a0df4bd50fde1ea60
+refs/heads/master: a0d22f485af1553060b4094ee0154537a8f6a8a6
diff --git a/trunk/arch/x86/mm/gup.c b/trunk/arch/x86/mm/gup.c
index be54176e9eb2..6340cef6798a 100644
--- a/trunk/arch/x86/mm/gup.c
+++ b/trunk/arch/x86/mm/gup.c
@@ -219,6 +219,22 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
 	return 1;
 }
 
+/**
+ * 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 get_user_pages_fast(unsigned long start, int nr_pages, int write,
 			struct page **pages)
 {