UPSTREAM: mm: VM_BUG_ON lru page flags
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 bc7112719e1e80e4208eef3fc9bd8d2b6c263e7d) BUG=b:123039911 TEST=Built Change-Id: I46712058a18b740251a7c1c80b9dcbcc42dac457 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2914047 Reviewed-by: Sean Paul <seanpaul@chromium.org> Reviewed-by: Sonny Rao <sonnyrao@chromium.org> Commit-Queue: Yu Zhao <yuzhao@chromium.org> Tested-by: Yu Zhao <yuzhao@chromium.org> Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
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@ -65,6 +65,8 @@ static inline enum lru_list page_lru_base_type(struct page *page)
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*/
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static __always_inline void __clear_page_lru_flags(struct page *page)
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{
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VM_BUG_ON_PAGE(!PageLRU(page), page);
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__ClearPageLRU(page);
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/* this shouldn't happen, so leave the flags to bad_page() */
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@ -86,6 +88,8 @@ static __always_inline enum lru_list page_lru(struct page *page)
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{
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enum lru_list lru;
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VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
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if (PageUnevictable(page))
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lru = LRU_UNEVICTABLE;
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else {
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@ -66,7 +66,6 @@ static void __page_cache_release(struct page *page)
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spin_lock_irqsave(zone_lru_lock(zone), flags);
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lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
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VM_BUG_ON_PAGE(!PageLRU(page), page);
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del_page_from_lru_list(page, lruvec);
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__clear_page_lru_flags(page);
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spin_unlock_irqrestore(zone_lru_lock(zone), flags);
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@ -818,7 +817,6 @@ void release_pages(struct page **pages, int nr)
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}
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lruvec = mem_cgroup_page_lruvec(page, locked_pgdat);
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VM_BUG_ON_PAGE(!PageLRU(page), page);
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del_page_from_lru_list(page, lruvec);
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__clear_page_lru_flags(page);
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}
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@ -4294,7 +4294,6 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
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continue;
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if (page_evictable(page)) {
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VM_BUG_ON_PAGE(PageActive(page), page);
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del_page_from_lru_list(page, lruvec);
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ClearPageUnevictable(page);
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add_page_to_lru_list(page, lruvec);
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