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author | Sasha Levin <sasha.levin@oracle.com> | 2014-01-23 15:52:54 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:36:50 -0800 |
commit | 309381feaee564281c3d9e90fbca8963bb7428ad (patch) | |
tree | 7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /include/linux/page-flags.h | |
parent | e3bba3c3c90cd434c1ccb9e5dc704a96baf9541c (diff) | |
download | linux-stable-309381feaee564281c3d9e90fbca8963bb7428ad.tar.gz linux-stable-309381feaee564281c3d9e90fbca8963bb7428ad.tar.bz2 linux-stable-309381feaee564281c3d9e90fbca8963bb7428ad.zip |
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 <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/page-flags.h')
-rw-r--r-- | include/linux/page-flags.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 98ada58f9942..e464b4e987e8 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); } |