1 files changed, 49 insertions, 6 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 3fa4c590cf12..4d9c916d06d9 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -251,10 +251,10 @@ extern int printk_delay_msec;
  * Print a one-time message (analogous to WARN_ONCE() et al):
  */
 #define printk_once(x...) ({                    \
-        static bool __print_once = true;        \
+        static bool __print_once;               \
                                                 \
-        if (__print_once) {                     \
-                __print_once = false;           \
+        if (!__print_once) {                    \
+                __print_once = true;            \
                 printk(x);                      \
         }                                       \
 })
@@ -397,15 +397,58 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #elif defined(CONFIG_DYNAMIC_DEBUG)
 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
-#define pr_debug(fmt, ...) do { \
-        dynamic_pr_debug(fmt, ##__VA_ARGS__); \
-        } while (0)
+#define pr_debug(fmt, ...) \
+        dynamic_pr_debug(fmt, ##__VA_ARGS__)
 #else
 #define pr_debug(fmt, ...) \
         ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
 #endif
 
 /*
+ * ratelimited messages with local ratelimit_state,
+ * no local ratelimit_state used in the !PRINTK case
+ */
+#ifdef CONFIG_PRINTK
+#define printk_ratelimited(fmt, ...)  ({                \
+        static struct ratelimit_state _rs = {           \
+                .interval = DEFAULT_RATELIMIT_INTERVAL, \
+                .burst = DEFAULT_RATELIMIT_BURST,       \
+        };                                              \
+                                                        \
+        if (!__ratelimit(&_rs))                         \
+                printk(fmt, ##__VA_ARGS__);             \
+})
+#else
+/* No effect, but we still get type checking even in the !PRINTK case: */
+#define printk_ratelimited printk
+#endif
+
+#define pr_emerg_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_alert_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_crit_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_err_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_warning_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_notice_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_info_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+/* no pr_cont_ratelimited, don't do that... */
+/* If you are writing a driver, please use dev_dbg instead */
+#if defined(DEBUG)
+#define pr_debug_ratelimited(fmt, ...) \
+        printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_debug_ratelimited(fmt, ...) \
+        ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
+                                     ##__VA_ARGS__); 0; })
+#endif
+
+/*
  * General tracing related utility functions - trace_printk(),
  * tracing_on/tracing_off and tracing_start()/tracing_stop
  *