[patch 035/155] mm/page-writeback.c: use VM_BUG_ON_PAGE in clear_page_dirty_for_io

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From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/page-writeback.c: use VM_BUG_ON_PAGE in clear_page_dirty_for_io

Dumping the page information in this circumstance helps for debugging.

Link: http://lkml.kernel.org/r/20200318140253.6141-7-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/page-writeback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/page-writeback.c~mm-use-vm_bug_on_page-in-clear_page_dirty_for_io
+++ a/mm/page-writeback.c
@@ -2655,7 +2655,7 @@ int clear_page_dirty_for_io(struct page
 	struct address_space *mapping = page_mapping(page);
 	int ret = 0;
 
-	BUG_ON(!PageLocked(page));
+	VM_BUG_ON_PAGE(!PageLocked(page), page);
 
 	if (mapping && mapping_cap_account_dirty(mapping)) {
 		struct inode *inode = mapping->host;
_




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