bug.h: Add WARN_RATELIMIT

commit b3eec79b0776e5340a3db75b34953977c7e5086e upstream.

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@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 18c435d7c082e387fdeca7a436e1e98f7ee3c2e3..bf58d4cfbb3018ffc4becd930f8b13c0d4806e5f 100644 (file)
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -135,6 +135,22 @@ extern void warn_slowpath_null(const char *file, const int line);
 #define WARN_ON_RATELIMIT(condition, state)                    \
                WARN_ON((condition) && __ratelimit(state))
 
+#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);              \
+})
+
 #ifdef CONFIG_SMP
 # define WARN_ON_SMP(x)                        WARN_ON(x)
 #else