Move scattered VM_BUG_ONs to two essential places that cover all
lru list additions and deletions.
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
---
include/linux/mm_inline.h | 4 ++++
mm/swap.c | 2 --
mm/vmscan.c | 1 -
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 07d9a0286635..7183c7a03f09 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -51,6 +51,8 @@ static __always_inline void update_lru_size(struct lruvec *lruvec,
*/
static __always_inline void __clear_page_lru_flags(struct page *page)
{
+ VM_BUG_ON_PAGE(!PageLRU(page), page);
+
__ClearPageLRU(page);
/* this shouldn't happen, so leave the flags to bad_page() */
@@ -72,6 +74,8 @@ static __always_inline enum lru_list page_lru(struct page *page)
{
enum lru_list lru;
+ VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
+
if (PageUnevictable(page))
return LRU_UNEVICTABLE;
diff --git a/mm/swap.c b/mm/swap.c
index b252f3593c57..4daa46907dd5 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -85,7 +85,6 @@ static void __page_cache_release(struct page *page)
spin_lock_irqsave(&pgdat->lru_lock, flags);
lruvec = mem_cgroup_page_lruvec(page, pgdat);
- VM_BUG_ON_PAGE(!PageLRU(page), page);
del_page_from_lru_list(page, lruvec);
__clear_page_lru_flags(page);
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
@@ -885,7 +884,6 @@ void release_pages(struct page **pages, int nr)
}
lruvec = mem_cgroup_page_lruvec(page, locked_pgdat);
- VM_BUG_ON_PAGE(!PageLRU(page), page);
del_page_from_lru_list(page, lruvec);
__clear_page_lru_flags(page);
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d93033407200..4688e495c242 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4276,7 +4276,6 @@ void check_move_unevictable_pages(struct pagevec *pvec)
continue;
if (page_evictable(page)) {
- VM_BUG_ON_PAGE(PageActive(page), page);
del_page_from_lru_list(page, lruvec);
ClearPageUnevictable(page);
add_page_to_lru_list(page, lruvec);
--
2.28.0.681.g6f77f65b4e-goog
