linux-kernel - [PATCH 2/3] Introduce VM_BUG_ON

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Date:	Fri, 29 Aug 2014 10:54:18 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	akpm@...ux-foundation.org
Cc:	kirill.shutemov@...ux.intel.com, khlebnikov@...nvz.org,
	riel@...hat.com, mgorman@...e.de, n-horiguchi@...jp.nec.com,
	mhocko@...e.cz, hughd@...gle.com, vbabka@...e.cz,
	walken@...gle.com, minchan@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH 2/3] Introduce VM_BUG_ON_VMA

Very similar to VM_BUG_ON_PAGE but dumps VMA information instead.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 include/linux/mmdebug.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index dfb9333..569e4c8 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -20,12 +20,20 @@ void dump_vma(const struct vm_area_struct *vma);
 			BUG();						\
 		}							\
 	} while (0)
+#define VM_BUG_ON_VMA(cond, vma)					\
+	do {								\
+		if (unlikely(cond)) {					\
+			dump_vma(vma);					\
+			BUG();						\
+		}							\
+	} while (0)
 #define VM_WARN_ON(cond) WARN_ON(cond)
 #define VM_WARN_ON_ONCE(cond) WARN_ON_ONCE(cond)
 #define VM_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
 #else
 #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
 #define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
+#define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
 #define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
 #define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
 #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
-- 
1.7.10.4

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