[PATCH] mm: gfp_atomic comments

Clarify in comments that GFP_ATOMIC means both "don't sleep" and "use
emergency pools", hence both ALLOC_HARDER and ALLOC_HIGH.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce991b173aa..d41a0662d4d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -931,7 +931,8 @@ restart:
          *
          * The caller may dip into page reserves a bit more if the caller
          * cannot run direct reclaim, or if the caller has realtime scheduling
-         * policy.
+         * policy or is asking for __GFP_HIGH memory.  GFP_ATOMIC requests will
+         * set both ALLOC_HARDER (!wait) and ALLOC_HIGH (__GFP_HIGH).
          */
         alloc_flags = ALLOC_WMARK_MIN;
         if ((unlikely(rt_task(p)) && !in_interrupt()) || !wait)