hugetlb: factor init_nodemask_of_node()

Factor init_nodemask_of_node() out of the nodemask_of_node() macro.

This will be used to populate the huge pages "nodes_allowed" nodemask for
a single node when basing nodes_allowed on a preferred/local mempolicy or
when a persistent huge page pool page count is modified via a per node
sysfs attribute.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Andi Kleen <andi@firstfloor.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Adam Litke <agl@us.ibm.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Eric Whitney <eric.whitney@hp.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index ca9b489a27f8..cbd521a03127 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -245,14 +245,19 @@ static inline int __next_node(int n, const nodemask_t *srcp)
         return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
 }
 
+static inline void init_nodemask_of_node(nodemask_t *mask, int node)
+{
+        nodes_clear(*mask);
+        node_set(node, *mask);
+}
+
 #define nodemask_of_node(node)                                          \
 ({                                                                      \
         typeof(_unused_nodemask_arg_) m;                                \
         if (sizeof(m) == sizeof(unsigned long)) {                       \
-                m.bits[0] = 1UL<<(node);                                \
+                m.bits[0] = 1UL << (node);                              \
         } else {                                                        \
-                nodes_clear(m);                                         \
-                node_set((node), m);                                    \
+                init_nodemask_of_node(&m, (node));                      \
         }                                                               \
         m;                                                              \
 })