backports: add printk_ratelimited()

This adds the backport for some printk_ratelimited() functions.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/backport/backport-include/linux/printk.h b/backport/backport-include/linux/printk.h
index 6bc993179cf1c77ebe596106cbe91eee42f5960e..ff7140bd97e1f9053f9d3136ba31c018f73896bf 100644 (file)
--- a/backport/backport-include/linux/printk.h
+++ b/backport/backport-include/linux/printk.h
@@ -97,6 +97,97 @@ static inline __attribute__ ((format (printf, 1, 2)))
 int no_printk(const char *s, ...) { return 0; }
 #endif
 
+#ifndef printk_ratelimited
+/*
+ * ratelimited messages with local ratelimit_state,
+ * no local ratelimit_state used in the !PRINTK case
+ */
+#ifdef CONFIG_PRINTK
+#define printk_ratelimited(fmt, ...)                                   \
+({                                                                     \
+       static DEFINE_RATELIMIT_STATE(_rs,                              \
+                                     DEFAULT_RATELIMIT_INTERVAL,       \
+                                     DEFAULT_RATELIMIT_BURST);         \
+                                                                       \
+       if (__ratelimit(&_rs))                                          \
+               printk(fmt, ##__VA_ARGS__);                             \
+})
+#else
+#define printk_ratelimited(fmt, ...)                                   \
+       no_printk(fmt, ##__VA_ARGS__)
+#endif
+#endif /* printk_ratelimited */
+
+#ifndef pr_emerg_ratelimited
+#define pr_emerg_ratelimited(fmt, ...)                                 \
+       printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_emerg_ratelimited */
+
+#ifndef pr_alert_ratelimited
+#define pr_alert_ratelimited(fmt, ...)                                 \
+       printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_alert_ratelimited */
+
+#ifndef pr_crit_ratelimited
+#define pr_crit_ratelimited(fmt, ...)                                  \
+       printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_crit_ratelimited */
+
+#ifndef pr_err_ratelimited
+#define pr_err_ratelimited(fmt, ...)                                   \
+       printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_err_ratelimited */
+
+#ifndef pr_warn_ratelimited
+#define pr_warn_ratelimited(fmt, ...)                                  \
+       printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_warn_ratelimited */
+
+#ifndef pr_notice_ratelimited
+#define pr_notice_ratelimited(fmt, ...)                                        \
+       printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_notice_ratelimited */
+
+#ifndef pr_info_ratelimited
+#define pr_info_ratelimited(fmt, ...)                                  \
+       printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+#endif /* pr_info_ratelimited */
+
+/* no pr_cont_ratelimited, don't do that... */
+
+#ifndef pr_devel_ratelimited
+#if defined(DEBUG)
+#define pr_devel_ratelimited(fmt, ...)                                 \
+       printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_devel_ratelimited(fmt, ...)                                 \
+       no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#endif
+#endif /* pr_devel_ratelimited */
+
+#ifndef pr_debug_ratelimited
+/* If you are writing a driver, please use dev_dbg instead */
+#if defined(CONFIG_DYNAMIC_DEBUG)
+/* descriptor check is first to prevent flooding with "callbacks suppressed" */
+#define pr_debug_ratelimited(fmt, ...)                                 \
+do {                                                                   \
+       static DEFINE_RATELIMIT_STATE(_rs,                              \
+                                     DEFAULT_RATELIMIT_INTERVAL,       \
+                                     DEFAULT_RATELIMIT_BURST);         \
+       DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
+       if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
+           __ratelimit(&_rs))                                          \
+               __dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__);    \
+} while (0)
+#elif defined(DEBUG)
+#define pr_debug_ratelimited(fmt, ...)                                 \
+       printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_debug_ratelimited(fmt, ...) \
+       no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#endif
+#endif /* pr_debug_ratelimited */
+
 #endif /* _COMPAT_LINUX_PRINTK_H */
 
 /* This must be outside -- see also kernel.h */