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From: Yu Zhao <yuzhao@google.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	 Alex Shi <alex.shi@linux.alibaba.com>
Cc: Michal Hocko <mhocko@kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	 Vladimir Davydov <vdavydov.dev@gmail.com>,
	Roman Gushchin <guro@fb.com>, Vlastimil Babka <vbabka@suse.cz>,
	 Matthew Wilcox <willy@infradead.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	 Yu Zhao <yuzhao@google.com>
Subject: [PATCH 07/11] mm: VM_BUG_ON lru page flags
Date: Mon,  7 Dec 2020 15:09:45 -0700
Message-ID: <20201207220949.830352-8-yuzhao@google.com> (raw)
In-Reply-To: <20201207220949.830352-1-yuzhao@google.com>

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

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
 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 ef3fd79222e5..6d907a4dd6ad 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -66,6 +66,8 @@ 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() */
@@ -87,6 +89,8 @@ 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 {
diff --git a/mm/swap.c b/mm/swap.c
index a37c896a32b0..09c4a48e0bcd 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -83,7 +83,6 @@ static void __page_cache_release(struct page *page)
 		unsigned long flags;
 
 		lruvec = lock_page_lruvec_irqsave(page, &flags);
-		VM_BUG_ON_PAGE(!PageLRU(page), page);
 		del_page_from_lru_list(page, lruvec);
 		__clear_page_lru_flags(page);
 		unlock_page_lruvec_irqrestore(lruvec, flags);
@@ -909,7 +908,6 @@ void release_pages(struct page **pages, int nr)
 			if (prev_lruvec != lruvec)
 				lock_batch = 0;
 
-			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 e6bdfdfa2da1..95e581c9d9af 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4279,7 +4279,6 @@ void check_move_unevictable_pages(struct pagevec *pvec)
 
 		lruvec = relock_page_lruvec_irq(page, lruvec);
 		if (page_evictable(page) && PageUnevictable(page)) {
-			VM_BUG_ON_PAGE(PageActive(page), page);
 			del_page_from_lru_list(page, lruvec);
 			ClearPageUnevictable(page);
 			add_page_to_lru_list(page, lruvec);
-- 
2.29.2.576.ga3fc446d84-goog



  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-07 22:09 [PATCH 00/11] mm: lru related cleanups Yu Zhao
2020-12-07 22:09 ` [PATCH 01/11] mm: use add_page_to_lru_list() Yu Zhao
2020-12-08  3:41   ` Alex Shi
2020-12-07 22:09 ` [PATCH 02/11] mm: shuffle lru list addition and deletion functions Yu Zhao
2020-12-07 22:09 ` [PATCH 03/11] mm: don't pass "enum lru_list" to lru list addition functions Yu Zhao
2020-12-08  8:14   ` Alex Shi
2020-12-08  8:24   ` Alex Shi
2020-12-07 22:09 ` [PATCH 04/11] mm: don't pass "enum lru_list" to trace_mm_lru_insertion() Yu Zhao
2020-12-08  8:46   ` Alex Shi
2020-12-07 22:09 ` [PATCH 05/11] mm: don't pass "enum lru_list" to del_page_from_lru_list() Yu Zhao
2020-12-07 22:09 ` [PATCH 06/11] mm: add __clear_page_lru_flags() to replace page_off_lru() Yu Zhao
2020-12-07 22:09 ` Yu Zhao [this message]
2020-12-07 22:24   ` [PATCH 07/11] mm: VM_BUG_ON lru page flags Matthew Wilcox
2020-12-16  0:54     ` Yu Zhao
2020-12-16  0:59       ` Matthew Wilcox
2020-12-07 22:09 ` [PATCH 08/11] mm: fold page_lru_base_type() into its sole caller Yu Zhao
2020-12-08  9:02   ` Alex Shi
2020-12-07 22:09 ` [PATCH 09/11] mm: fold __update_lru_size() " Yu Zhao
2020-12-08  9:07   ` Alex Shi
2020-12-07 22:09 ` [PATCH 10/11] mm: make lruvec_lru_size() static Yu Zhao
2020-12-08  9:09   ` Alex Shi
2020-12-07 22:09 ` [PATCH 11/11] mm: enlarge the "int nr_pages" parameter of update_lru_size() Yu Zhao
2020-12-08  9:15   ` Alex Shi
2020-12-14 21:50   ` Hugh Dickins
2020-12-16  0:18     ` Yu Zhao
2020-12-10  9:28 ` [PATCH 00/11] mm: lru related cleanups Alex Shi
2020-12-16  0:48   ` Yu Zhao

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