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 --- include/linux/page-flags.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'include/linux/page-flags.h') diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 98ada58f994..e464b4e987e 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -412,7 +412,7 @@ static inline void ClearPageCompound(struct page *page) */ static inline int PageTransHuge(struct page *page) { - VM_BUG_ON(PageTail(page)); + VM_BUG_ON_PAGE(PageTail(page), page); return PageHead(page); } @@ -460,25 +460,25 @@ static inline int PageTransTail(struct page *page) */ static inline int PageSlabPfmemalloc(struct page *page) { - VM_BUG_ON(!PageSlab(page)); + VM_BUG_ON_PAGE(!PageSlab(page), page); return PageActive(page); } static inline void SetPageSlabPfmemalloc(struct page *page) { - VM_BUG_ON(!PageSlab(page)); + VM_BUG_ON_PAGE(!PageSlab(page), page); SetPageActive(page); } static inline void __ClearPageSlabPfmemalloc(struct page *page) { - VM_BUG_ON(!PageSlab(page)); + VM_BUG_ON_PAGE(!PageSlab(page), page); __ClearPageActive(page); } static inline void ClearPageSlabPfmemalloc(struct page *page) { - VM_BUG_ON(!PageSlab(page)); + VM_BUG_ON_PAGE(!PageSlab(page), page); ClearPageActive(page); } -- cgit v1.2.3-70-g09d2