[PATCH 1/6] Mlock: fix __mlock_vma_pages_range comment block

[Lee Schermerhorn <lee.schermerhorn@hp.com>]

Against:  2.6.27-rc3-mmotm-080819-0259:

fix to mmap-handle-mlocked-pages-during-map-remap-unmap.patch

__mlock_vma_pages_range comment block needs updating:
 - it fails to mention the mlock parameter
 - no longer requires that mmap_sem be held for write.

following patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>

 mm/mlock.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

Index: linux-2.6.27-rc3-mmotm/mm/mlock.c
===================================================================
--- linux-2.6.27-rc3-mmotm.orig/mm/mlock.c	2008-08-18 11:41:19.000000000 -0400
+++ linux-2.6.27-rc3-mmotm/mm/mlock.c	2008-08-18 11:48:13.000000000 -0400
@@ -112,12 +112,20 @@ static void munlock_vma_page(struct page
 	}
 }
 
-/*
- * mlock a range of pages in the vma.
+/**
+ * __mlock_vma_pages_range() -  mlock/munlock a range of pages in the vma.
+ * @vma:   target vma
+ * @start: start address
+ * @end:   end address
+ * @mlock: 0 indicate munlock, otherwise mlock.
+ *
+ * If @mlock == 0, unlock an mlocked range;
+ * else mlock the range of pages.  This takes care of making the pages present ,
+ * too.
  *
- * This takes care of making the pages present too.
+ * return 0 on success, negative error code on error.
  *
- * vma->vm_mm->mmap_sem must be held for write.
+ * vma->vm_mm->mmap_sem must be held for at least read.
  */
 static int __mlock_vma_pages_range(struct vm_area_struct *vma,
 				   unsigned long start, unsigned long end,

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