mm: add a reminder comment for __GFP_BITS_SHIFT

Cc: Glauber Costa <glommer@parallels.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index b8f2e5f6abdf5c09aea97d6f75ec66cd6836afe4..c0fb4d81ebb6a6d02144447ce3c04aa899df92a1 100644 (file)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -34,6 +34,7 @@ struct vm_area_struct;
 #define ___GFP_OTHER_NODE      0x200000u
 #define ___GFP_WRITE           0x400000u
 #define ___GFP_KMEMCG          0x800000u
+/* If the above are modified, __GFP_BITS_SHIFT may need updating */
 
 /*
  * GFP bitmasks..