[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 06699d871a8e568325361f5935ea72dacbd4f635..ebad6bbb35012570944117a4a495f2f6782e8f12 100644 (file)
--- 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);