Re: Slab: Node rotor for freeing alien caches and remote per cpu pages.

[Christoph Lameter <clameter@engr.sgi.com>]

Fix two issues in the patch as suggested by Kiran:

1. next_node() cannot return a node number >MAX_NUMNODES. So use ==

2. Node online map should not be empty during bootup so we can
   skip the code that I added to deal with that situation.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.16-rc4/mm/slab.c
===================================================================
--- linux-2.6.16-rc4.orig/mm/slab.c	2006-02-23 10:20:16.000000000 -0800
+++ linux-2.6.16-rc4/mm/slab.c	2006-02-23 13:28:34.000000000 -0800
@@ -803,7 +803,7 @@ static void init_reap_node(int cpu)
 	int node;
 
 	node = next_node(cpu_to_node(cpu), node_online_map);
-	if (node >= MAX_NUMNODES)
+	if (node == MAX_NUMNODES)
 		node = 0;
 
 	__get_cpu_var(reap_node) = node;
@@ -820,15 +820,8 @@ static void next_reap_node(void)
 		drain_node_pages(node);
 
 	node = next_node(node, node_online_map);
-	if (unlikely(node >= MAX_NUMNODES)) {
+	if (unlikely(node >= MAX_NUMNODES))
 		node = first_node(node_online_map);
-		/*
-		 * If the node_online_map is empty (early boot) then
-		 * only use node zero.
-		*/
-		if (node >= MAX_NUMNODES)
-			node = 0;
-	}
 	__get_cpu_var(reap_node) = node;
 }
 

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