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-rw-r--r--include/linux/page-isolation.h4
-rw-r--r--mm/page_alloc.c2
-rw-r--r--mm/page_isolation.c16
3 files changed, 19 insertions, 3 deletions
diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 105077aa7685..fca8c0a5c188 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -6,6 +6,10 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count);
void set_pageblock_migratetype(struct page *page, int migratetype);
int move_freepages_block(struct zone *zone, struct page *page,
int migratetype);
+int move_freepages(struct zone *zone,
+ struct page *start_page, struct page *end_page,
+ int migratetype);
+
/*
* Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
* If specified range includes migrate types other than MOVABLE or CMA,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 94fd283dde98..82f0b2f54f81 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -925,7 +925,7 @@ static int fallbacks[MIGRATE_TYPES][4] = {
* Note that start_page and end_pages are not aligned on a pageblock
* boundary. If alignment is required, use move_freepages_block()
*/
-static int move_freepages(struct zone *zone,
+int move_freepages(struct zone *zone,
struct page *start_page, struct page *end_page,
int migratetype)
{
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 &&