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authorXishi Qiu <qiuxishi@huawei.com>2016-04-01 14:31:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-04-01 17:03:37 -0500
commit6f25a14a7053b69917e2ebea0d31dd444cd31fd5 (patch)
tree48914967e96ffd5e054252cab541f15f768323ee /mm/page_isolation.c
parent969e8d7e47f93ef693028667480558de8f70523f (diff)
downloadlinux-6f25a14a7053b69917e2ebea0d31dd444cd31fd5.tar.bz2
mm: fix invalid node in alloc_migrate_target()
It is incorrect to use next_node to find a target node, it will return MAX_NUMNODES or invalid node. This will lead to crash in buddy system allocation. Fixes: c8721bbbdd36 ("mm: memory-hotplug: enable memory hotplug to handle hugepage") Signed-off-by: Xishi Qiu <qiuxishi@huawei.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: David Rientjes <rientjes@google.com> Cc: "Laura Abbott" <lauraa@codeaurora.org> Cc: Hui Zhu <zhuhui@xiaomi.com> Cc: Wang Xiaoqiang <wangxq10@lzu.edu.cn> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_isolation.c')
-rw-r--r--mm/page_isolation.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 92c4c36501e7..31555b689eb9 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -289,11 +289,11 @@ struct page *alloc_migrate_target(struct page *page, unsigned long private,
* now as a simple work-around, we use the next node for destination.
*/
if (PageHuge(page)) {
- nodemask_t src = nodemask_of_node(page_to_nid(page));
- nodemask_t dst;
- nodes_complement(dst, src);
+ int node = next_online_node(page_to_nid(page));
+ if (node == MAX_NUMNODES)
+ node = first_online_node;
return alloc_huge_page_node(page_hstate(compound_head(page)),
- next_node(page_to_nid(page), dst));
+ node);
}
if (PageHighMem(page))