diff options
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 4fe7e3aa02e2..acb7611cd525 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1085,21 +1085,25 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src, page = lru_to_page(src); prefetchw_prev_lru_page(page, src, flags); - if (!TestClearPageLRU(page)) - BUG(); list_del(&page->lru); - if (get_page_testone(page)) { + if (unlikely(get_page_testone(page))) { /* * It is being freed elsewhere */ __put_page(page); - SetPageLRU(page); list_add(&page->lru, src); continue; - } else { - list_add(&page->lru, dst); - nr_taken++; } + + /* + * Be careful not to clear PageLRU until after we're sure + * the page is not being freed elsewhere -- the page release + * code relies on it. + */ + if (!TestClearPageLRU(page)) + BUG(); + list_add(&page->lru, dst); + nr_taken++; } *scanned = scan; |