From 309381feaee564281c3d9e90fbca8963bb7428ad Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Thu, 23 Jan 2014 15:52:54 -0800 Subject: mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE Most of the VM_BUG_ON assertions are performed on a page. Usually, when one of these assertions fails we'll get a BUG_ON with a call stack and the registers. I've recently noticed based on the requests to add a small piece of code that dumps the page to various VM_BUG_ON sites that the page dump is quite useful to people debugging issues in mm. This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what VM_BUG_ON() does, also dumps the page before executing the actual BUG_ON. [akpm@linux-foundation.org: fix up includes] Signed-off-by: Sasha Levin Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/cleancache.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'mm/cleancache.c') diff --git a/mm/cleancache.c b/mm/cleancache.c index 5875f48ce279..d0eac4350403 100644 --- a/mm/cleancache.c +++ b/mm/cleancache.c @@ -237,7 +237,7 @@ int __cleancache_get_page(struct page *page) goto out; } - VM_BUG_ON(!PageLocked(page)); + VM_BUG_ON_PAGE(!PageLocked(page), page); fake_pool_id = page->mapping->host->i_sb->cleancache_poolid; if (fake_pool_id < 0) goto out; @@ -279,7 +279,7 @@ void __cleancache_put_page(struct page *page) return; } - VM_BUG_ON(!PageLocked(page)); + VM_BUG_ON_PAGE(!PageLocked(page), page); fake_pool_id = page->mapping->host->i_sb->cleancache_poolid; if (fake_pool_id < 0) return; @@ -318,7 +318,7 @@ void __cleancache_invalidate_page(struct address_space *mapping, if (pool_id < 0) return; - VM_BUG_ON(!PageLocked(page)); + VM_BUG_ON_PAGE(!PageLocked(page), page); if (cleancache_get_key(mapping->host, &key) >= 0) { cleancache_ops->invalidate_page(pool_id, key, page->index); -- cgit