[PATCH stable 1/4] kernel.h: add printk_ratelimited and pr_<level>_rl
From: Ben Hutchings <hidden>
Date: 2012-01-17 04:06:22
Also in:
linux-scsi, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Joe Perches <joe@perches.com> commit 8a64f336bc1d4aa203b138d29d5a9c414a9fbb47 upstream. Add a printk_ratelimited statement expression macro that uses a per-call ratelimit_state so that multiple subsystems output messages are not suppressed by a global __ratelimit state. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: s/_rl/_ratelimited/g] Signed-off-by: Joe Perches <joe@perches.com> Cc: Naohiro Ooiwa <redacted> Cc: Ingo Molnar <redacted> Cc: Hiroshi Shimamoto <redacted> Cc: Peter Zijlstra <redacted> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- This is a prerequisite for patch 3. Ben. include/linux/kernel.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f4e3184..1221fe4 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h@@ -407,6 +407,50 @@ static inline char *pack_hex_byte(char *buf, u8 byte) #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 *
--
1.7.8.2