From fdb7cc59084ba7eef935e4e40aaaf538ee34c625 Mon Sep 17 00:00:00 2001
From: Paul Jackson <pj@sgi.com>
Date: Wed, 22 Mar 2006 00:09:10 -0800
Subject: [PATCH] mm: hugetlb alloc_fresh_huge_page bogus node loop fix

Fix bogus node loop in hugetlb.c alloc_fresh_huge_page(), which was
assuming that nodes are numbered contiguously from 0 to num_online_nodes().
Once the hotplug folks get this far, that will be false.

Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 06699d8..ebad6bb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -105,7 +105,9 @@ static int alloc_fresh_huge_page(void)
 	struct page *page;
 	page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
 					HUGETLB_PAGE_ORDER);
-	nid = (nid + 1) % num_online_nodes();
+	nid = next_node(nid, node_online_map);
+	if (nid == MAX_NUMNODES)
+		nid = first_node(node_online_map);
 	if (page) {
 		page[1].lru.next = (void *)free_huge_page;	/* dtor */
 		spin_lock(&hugetlb_lock);
-- 
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