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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2010-10-26 14:21:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:06 -0700
commit4b20477f588055fbe87e69435d3c2344d250f0d7 (patch)
tree4e4d1ef7280ea5c09ff10489e6b9c47bc1223a73 /mm
parentcf608ac19c95804dc2df43b1f4f9e068aa9034ab (diff)
downloadvexpress-lsk-4b20477f588055fbe87e69435d3c2344d250f0d7.tar.gz
memory hotplug: fix notifier's return value check
Even if notifier cannot find any pages, it doesn't mean no pages are available...And, if there are no notifiers registered, this condition will be always true and memory hotplug will show -EBUSY. This is a bug but not critical. In most case, a pageblock which will be offlined is MIGRATE_MOVABLE This "notifier" is called only when the pageblock is _not_ MIGRATE_MOVABLE. But if not MIGRATE_MOVABLE, it's common case that memory hotplug will fail. So, no one notice this bug. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5faf876cfc3..099790052bf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5336,7 +5336,7 @@ int set_migratetype_isolate(struct page *page)
*/
notifier_ret = memory_isolate_notify(MEM_ISOLATE_COUNT, &arg);
notifier_ret = notifier_to_errno(notifier_ret);
- if (notifier_ret || !arg.pages_found)
+ if (notifier_ret)
goto out;
for (iter = pfn; iter < (pfn + pageblock_nr_pages); iter++) {