From 35f3aa39f243e8c95e12a2b2d05b1d2e62ac58a4 Mon Sep 17 00:00:00 2001 From: Lance Roy Date: Thu, 4 Oct 2018 23:45:47 -0700 Subject: [PATCH] mm: Replace spin_is_locked() with lockdep lockdep_assert_held() is better suited to checking locking requirements, since it only checks if the current thread holds the lock regardless of whether someone else does. This is also a step towards possibly removing spin_is_locked(). Signed-off-by: Lance Roy Cc: Andrew Morton Cc: "Kirill A. Shutemov" Cc: Yang Shi Cc: Matthew Wilcox Cc: Mel Gorman Acked-by: Vlastimil Babka Cc: Jan Kara Cc: Shakeel Butt Cc: Signed-off-by: Paul E. McKenney --- mm/khugepaged.c | 4 ++-- mm/swap.c | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index c13625c1ad5e..7b86600a47c9 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1225,7 +1225,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot) { struct mm_struct *mm = mm_slot->mm; - VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock)); + lockdep_assert_held(&khugepaged_mm_lock); if (khugepaged_test_exit(mm)) { /* free mm_slot */ @@ -1631,7 +1631,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int progress = 0; VM_BUG_ON(!pages); - VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock)); + lockdep_assert_held(&khugepaged_mm_lock); if (khugepaged_scan.mm_slot) mm_slot = khugepaged_scan.mm_slot; diff --git a/mm/swap.c b/mm/swap.c index aa483719922e..5d786019eab9 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -823,8 +823,7 @@ void lru_add_page_tail(struct page *page, struct page *page_tail, VM_BUG_ON_PAGE(!PageHead(page), page); VM_BUG_ON_PAGE(PageCompound(page_tail), page); VM_BUG_ON_PAGE(PageLRU(page_tail), page); - VM_BUG_ON(NR_CPUS != 1 && - !spin_is_locked(&lruvec_pgdat(lruvec)->lru_lock)); + lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock); if (!list) SetPageLRU(page_tail);