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-rw-r--r--mm/page_isolation.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 6744235d2d0e..5f34a9053ce0 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -201,8 +201,20 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn)
}
page = pfn_to_page(pfn);
if (PageBuddy(page)) {
- if (get_freepage_migratetype(page) != MIGRATE_ISOLATE)
- break;
+ /*
+ * If race between isolatation and allocation happens,
+ * some free pages could be in MIGRATE_MOVABLE list
+ * although pageblock's migratation type of the page
+ * is MIGRATE_ISOLATE. Catch it and move the page into
+ * MIGRATE_ISOLATE list.
+ */
+ if (get_freepage_migratetype(page) != MIGRATE_ISOLATE) {
+ struct page *end_page;
+
+ end_page = page + (1 << page_order(page)) - 1;
+ move_freepages(page_zone(page), page, end_page,
+ MIGRATE_ISOLATE);
+ }
pfn += 1 << page_order(page);
}
else if (page_count(page) == 0 &&