X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=mm%2Fmlock.c;h=ce84cb0b83ef56179facdacc286bce88abd05fae;hb=2f39691f31a22e0c6d82573d91306059f8ef920c;hp=b1eb53634005606298d115ac5cdeb90cac923957;hpb=042f7b7cbd1e531278a09c449563165ba1f07673;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/mlock.c b/mm/mlock.c
index b1eb53634005..ce84cb0b83ef 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -210,12 +210,19 @@ out:
  * @vma:   target vma
  * @start: start address
  * @end:   end address
+ * @nonblocking:
  *
  * 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 at least read.
+ * vma->vm_mm->mmap_sem must be held.
+ *
+ * If @nonblocking is NULL, it may be held for read or write and will
+ * be unperturbed.
+ *
+ * If @nonblocking is non-NULL, it must held for read only and may be
+ * released.  If it's released, *@nonblocking will be set to 0.
  */
 long __mlock_vma_pages_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end, int *nonblocking)