make GFP_NOTRACK definition unconditional

There was a general sentiment in a recent discussion (See
https://lkml.org/lkml/2012/9/18/258) that the __GFP flags should be
defined unconditionally.  Currently, the only offender is GFP_NOTRACK,
which is conditional to KMEMCHECK.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/gfp.h

@@ -30,11 +30,7 @@ struct vm_area_struct;
 #define ___GFP_HARDWALL		0x20000u
 #define ___GFP_THISNODE		0x40000u
 #define ___GFP_RECLAIMABLE	0x80000u
-#ifdef CONFIG_KMEMCHECK
 #define ___GFP_NOTRACK		0x200000u
-#else
-#define ___GFP_NOTRACK		0
-#endif
 #define ___GFP_OTHER_NODE	0x800000u
 #define ___GFP_WRITE		0x1000000u