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authorYaowei Bai <baiyaowei@cmss.chinamobile.com>2016-01-14 15:19:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commitc00eb15a8914b8ba84032a36044a5aaf7f71709d (patch)
treedf9fd900dac20444f5e5b6780dba9b95a1bc7515 /include/linux/mmzone.h
parent06640290bfc6688062387f915c5df094e9872133 (diff)
mm/zonelist: enumerate zonelists array index
Hardcoding index to zonelists array in gfp_zonelist() is not a good idea, let's enumerate it to improve readability. No functional change. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix CONFIG_NUMA=n build] [n-horiguchi@ah.jp.nec.com: fix warning in comparing enumerator] Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h20
1 files changed, 9 insertions, 11 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 996384672c73..12c98dfc31b1 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -571,19 +571,17 @@ static inline bool zone_is_empty(struct zone *zone)
/* Maximum number of zones on a zonelist */
#define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES)
+enum {
+ ZONELIST_FALLBACK, /* zonelist with fallback */
#ifdef CONFIG_NUMA
-
-/*
- * The NUMA zonelists are doubled because we need zonelists that restrict the
- * allocations to a single node for __GFP_THISNODE.
- *
- * [0] : Zonelist with fallback
- * [1] : No fallback (__GFP_THISNODE)
- */
-#define MAX_ZONELISTS 2
-#else
-#define MAX_ZONELISTS 1
+ /*
+ * The NUMA zonelists are doubled because we need zonelists that
+ * restrict the allocations to a single node for __GFP_THISNODE.
+ */
+ ZONELIST_NOFALLBACK, /* zonelist without fallback (__GFP_THISNODE) */
#endif
+ MAX_ZONELISTS
+};
/*
* This struct contains information about a zone in a zonelist. It is stored