The patch titled
memory unplug: isolate_lru_page fix
has been added to the -mm tree. Its filename is
memory-unplug-v7-isolate_lru_page-fix.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: memory unplug: isolate_lru_page fix
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
release_pages() in mm/swap.c changes page_count() to be 0 without removing
PageLRU flag...
This means isolate_lru_page() can see a page, PageLRU() &&
page_count(page)==0.. This is BUG. (get_page() will be called against
count=0 page.)
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 3 +--
1 files changed, 1 insertion(+), 2 deletions(-)
diff -puN mm/migrate.c~memory-unplug-v7-isolate_lru_page-fix mm/migrate.c
--- a/mm/migrate.c~memory-unplug-v7-isolate_lru_page-fix
+++ a/mm/migrate.c
@@ -49,9 +49,8 @@ int isolate_lru_page(struct page *page,
struct zone *zone = page_zone(page);
spin_lock_irq(&zone->lru_lock);
- if (PageLRU(page)) {
+ if (PageLRU(page) && get_page_unless_zero(page)) {
ret = 0;
- get_page(page);
ClearPageLRU(page);
if (PageActive(page))
del_page_from_active_list(zone, page);
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
change-zonelist-order-zonelist-order-selection-logic.patch
change-zonelist-order-zonelist-order-selection-logic-add-check_highest_zone-to-build_zonelists_in_zone_order.patch
change-zonelist-order-v6-zonelist-fix.patch
change-zonelist-order-v6-zonelist-fix-2.patch
change-zonelist-order-auto-configuration.patch
change-zonelist-order-documentaion.patch
memory-unplug-v7-migration-by-kernel.patch
memory-unplug-v7-isolate_lru_page-fix.patch
memory-unplug-v7-memory-hotplug-cleanup.patch
memory-unplug-v7-page-isolation.patch
memory-unplug-v7-page-offline.patch
memory-unplug-v7-ia64-interface.patch
-
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