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Commit 8a64f336 authored by Joe Perches's avatar Joe Perches Committed by Linus Torvalds
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kernel.h: add printk_ratelimited and pr_<level>_rl 



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: default avatarJoe Perches <joe@perches.com>
Cc: Naohiro Ooiwa <nooiwa@miraclelinux.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2643434c

include/linux/kernel.h

+44 −0
Original line number Diff line number Diff line
@@ -404,6 +404,50 @@ static inline char *pack_hex_byte(char *buf, u8 byte) 
	({ 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