linux-kernel - [PATCH] [89/99] bug.h: Add WARN

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Message-Id: <20110727214928.DFC1C2403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:49:28 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	joe@...ches.com, davem@...emloft.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [89/99] bug.h: Add WARN_RATELIMIT

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Perches <joe@...ches.com>

[ Upstream commit b3eec79b0776e5340a3db75b34953977c7e5086e ]

Add a generic mechanism to ratelimit WARN(foo, fmt, ...) messages
using a hidden per call site static struct ratelimit_state.

Also add an __WARN_RATELIMIT variant to be able to use a specific
struct ratelimit_state.

Signed-off-by: Joe Perches <joe@...ches.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 include/asm-generic/bug.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Index: linux-2.6.35.y/include/asm-generic/bug.h
===================================================================
--- linux-2.6.35.y.orig/include/asm-generic/bug.h
+++ linux-2.6.35.y/include/asm-generic/bug.h
@@ -53,6 +53,22 @@ struct bug_entry {
 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
 #endif
 
+#define __WARN_RATELIMIT(condition, state, format...)		\
+({								\
+	int rtn = 0;						\
+	if (unlikely(__ratelimit(state)))			\
+		rtn = WARN(condition, format);			\
+	rtn;							\
+})
+
+#define WARN_RATELIMIT(condition, format...)			\
+({								\
+	static DEFINE_RATELIMIT_STATE(_rs,			\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);	\
+	__WARN_RATELIMIT(condition, &_rs, format);		\
+})
+
 /*
  * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
  * significant issues that need prompt attention if they should ever
--
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