[PATCH 05/18] Various VM_BUG_ON for securing tail pages usage
From: Radosław Smogura <hidden>
Date: 2012-02-16 14:32:52
Also in:
linux-mm
Subsystem:
memory management, memory management - mglru (multi-gen lru), memory management - reclaim, the rest · Maintainers:
Andrew Morton, Johannes Weiner, Linus Torvalds
Signed-off-by: Radosław Smogura <redacted> --- mm/vmscan.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c52b235..7299b71 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c@@ -636,7 +636,7 @@ void putback_lru_page(struct page *page) int was_unevictable = PageUnevictable(page); VM_BUG_ON(PageLRU(page)); - + VM_BUG_ON(PageTail(page)); redo: ClearPageUnevictable(page);
@@ -1177,6 +1177,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, prefetchw_prev_lru_page(page, src, flags); VM_BUG_ON(!PageLRU(page)); + VM_BUG_ON(PageTail(page)); switch (__isolate_lru_page(page, mode, file)) { case 0:
@@ -1239,6 +1240,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, if (__isolate_lru_page(cursor_page, mode, file) == 0) { unsigned int isolated_pages; + VM_BUG_ON(PageTail(cursor_page)); + mem_cgroup_lru_del(cursor_page); list_move(&cursor_page->lru, dst); isolated_pages = hpage_nr_pages(cursor_page);
--
1.7.3.4
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