diff options
| -rw-r--r-- | mm/memory-failure.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ceb0c7f1932..2c13aa7a016 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1410,7 +1410,8 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags) /* * Isolate the page, so that it doesn't get reallocated if it - * was free. + * was free. This flag should be kept set until the source page + * is freed and PG_hwpoison on it is set. */ set_migratetype_isolate(p, true); /* @@ -1433,7 +1434,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags) /* Not a free page */ ret = 1; } - unset_migratetype_isolate(p, MIGRATE_MOVABLE); unlock_memory_hotplug(); return ret; } @@ -1494,7 +1494,6 @@ static int soft_offline_huge_page(struct page *page, int flags) atomic_long_add(1 << compound_trans_order(hpage), &num_poisoned_pages); } - /* keep elevated page count for bad page */ return ret; } @@ -1559,7 +1558,7 @@ int soft_offline_page(struct page *page, int flags) atomic_long_inc(&num_poisoned_pages); } } - /* keep elevated page count for bad page */ + unset_migratetype_isolate(page, MIGRATE_MOVABLE); return ret; } @@ -1625,7 +1624,22 @@ static int __soft_offline_page(struct page *page, int flags) if (ret > 0) ret = -EIO; } else { + /* + * After page migration succeeds, the source page can + * be trapped in pagevec and actual freeing is delayed. + * Freeing code works differently based on PG_hwpoison, + * so there's a race. We need to make sure that the + * source page should be freed back to buddy before + * setting PG_hwpoison. + */ + if (!is_free_buddy_page(page)) + lru_add_drain_all(); + if (!is_free_buddy_page(page)) + drain_all_pages(); SetPageHWPoison(page); + if (!is_free_buddy_page(page)) + pr_info("soft offline: %#lx: page leaked\n", + pfn); atomic_long_inc(&num_poisoned_pages); } } else { |