vm: add kzalloc_node() inline

To get zeroed out memory from a particular NUMA node.  To be used by
sunrpc.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/slab.h

@@ -276,6 +276,17 @@ static inline void *kzalloc(size_t size, gfp_t flags)
 	return kmalloc(size, flags | __GFP_ZERO);
 }
 
+/**
+ * kzalloc_node - allocate zeroed memory from a particular memory node.
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate (see kmalloc).
+ * @node: memory node from which to allocate
+ */
+static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
+{
+	return kmalloc_node(size, flags | __GFP_ZERO, node);
+}
+
 #ifdef CONFIG_SLABINFO
 extern const struct seq_operations slabinfo_op;
 ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);