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-rw-r--r--mm/vmscan.c25
1 files changed, 11 insertions, 14 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8e477b1a4838..e21bab4deda6 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1083,29 +1083,26 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src,
1083 int scan = 0; 1083 int scan = 0;
1084 1084
1085 while (scan++ < nr_to_scan && !list_empty(src)) { 1085 while (scan++ < nr_to_scan && !list_empty(src)) {
1086 struct list_head *target;
1086 page = lru_to_page(src); 1087 page = lru_to_page(src);
1087 prefetchw_prev_lru_page(page, src, flags); 1088 prefetchw_prev_lru_page(page, src, flags);
1088 1089
1089 BUG_ON(!PageLRU(page)); 1090 BUG_ON(!PageLRU(page));
1090 1091
1091 list_del(&page->lru); 1092 list_del(&page->lru);
1092 if (unlikely(get_page_testone(page))) { 1093 target = src;
1094 if (likely(get_page_unless_zero(page))) {
1093 /* 1095 /*
1094 * It is being freed elsewhere 1096 * Be careful not to clear PageLRU until after we're
1097 * sure the page is not being freed elsewhere -- the
1098 * page release code relies on it.
1095 */ 1099 */
1096 __put_page(page); 1100 ClearPageLRU(page);
1097 list_add(&page->lru, src); 1101 target = dst;
1098 continue; 1102 nr_taken++;
1099 } 1103 } /* else it is being freed elsewhere */
1100 1104
1101 /* 1105 list_add(&page->lru, target);
1102 * Be careful not to clear PageLRU until after we're sure
1103 * the page is not being freed elsewhere -- the page release
1104 * code relies on it.
1105 */
1106 ClearPageLRU(page);
1107 list_add(&page->lru, dst);
1108 nr_taken++;
1109 } 1106 }
1110 1107
1111 *scanned = scan; 1108 *scanned = scan;