mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

[linux-block.git] / include / linux / mmdebug.h

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 580bd587d916cfa28116e814b24639e1719efe5c..5042c036dda9fcddcef627743d588f62b5aa4aaf 100644 (file)
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -1,10 +1,19 @@
 #ifndef LINUX_MM_DEBUG_H
 #define LINUX_MM_DEBUG_H 1
 
+struct page;
+
+extern void dump_page(struct page *page, char *reason);
+extern void dump_page_badflags(struct page *page, char *reason,
+                              unsigned long badflags);
+
 #ifdef CONFIG_DEBUG_VM
 #define VM_BUG_ON(cond) BUG_ON(cond)
+#define VM_BUG_ON_PAGE(cond, page) \
+       do { if (unlikely(cond)) { dump_page(page, NULL); BUG(); } } while (0)
 #else
 #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
+#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
 #endif
 
 #ifdef CONFIG_DEBUG_VIRTUAL