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BACKPORT: mm: VM_BUG_ON lru page flags

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Move scattered VM_BUG_ONs to two essential places that cover all
lru list additions and deletions.

Link: https://lore.kernel.org/linux-mm/20201207220949.830352-8-yuzhao@google.com/
Link: https://lkml.kernel.org/r/20210122220600.906146-8-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit bc7112719e)
Bug: 227651406
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Change-Id: I950ad4171f973c740d9fc3778d44efc020d0e12c
This commit is contained in:
Yu Zhao
2020-10-02 02:08:58 -06:00
committed by Todd Kjos
parent bcc2f50f7b
commit aadc45fae6
3 changed files with 4 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/mm_inline.h
View File

@@ -67,6 +67,8 @@ static inline enum lru_list page_lru_base_type(struct page *page)
*/
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() */
@@ -88,6 +90,8 @@ 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))
lru = LRU_UNEVICTABLE;
else {

2
mm/swap.c
View File

@@ -87,7 +87,6 @@ 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);
@@ -1040,7 +1039,6 @@ 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);
}

1
mm/vmscan.c
View File

@@ -4417,7 +4417,6 @@ 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);