diff mbox series

[RFC,3/9] printk: Add printk_emit_ratelimited macro

Message ID 20191223225558.19242-4-tasleson@redhat.com (mailing list archive)
State New, archived
Headers show
Series Add persistent durable identifier to storage log messages | expand

Commit Message

Tony Asleson Dec. 23, 2019, 10:55 p.m. UTC 
Needed so we can add structured data to the block layer
logging.

Signed-off-by: Tony Asleson <tasleson@redhat.com>
---
 include/linux/printk.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 06c3ba5b695e..dd41b79e6f06 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -172,6 +172,18 @@  int printk_emit(int facility, int level,
 		const char *dict, size_t dictlen,
 		const char *fmt, ...);
 
+#define printk_emit_ratelimited(facility, level,			\
+		dict, dict_len, fmt, ...)				\
+({									\
+	static DEFINE_RATELIMIT_STATE(_ers,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+									\
+	if (__ratelimit(&_ers))						\
+		printk_emit(facility, level,				\
+				dict, dict_len, fmt, ##__VA_ARGS__);	\
+})
+
 asmlinkage __printf(1, 2) __cold
 int printk(const char *fmt, ...);