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ratelimit: add comment warning people off printk_ratelimit()

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printk_ratelimit() was a bad idea - we don't want subsytem A causing
ratelimiting of subsystem B's messages.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2010-10-26 14:22:49 -07:00 • committed by Linus Torvalds
parent f5d87d851d
commit 77006a0a82
1 changed files with 5 additions and 0 deletions
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5
include/linux/kernel.h
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@ -277,6 +277,11 @@ asmlinkage int vprintk(const char *fmt, va_list args)
asmlinkage int printk(const char * fmt, ...) asmlinkage int printk(const char * fmt, ...)
__attribute__ ((format (printf, 1, 2))) __cold; __attribute__ ((format (printf, 1, 2))) __cold;
/*
* Please don't use printk_ratelimit(), because it shares ratelimiting state
* with all other unrelated printk_ratelimit() callsites. Instead use
* printk_ratelimited() or plain old __ratelimit().
*/
extern int __printk_ratelimit(const char *func); extern int __printk_ratelimit(const char *func);
#define printk_ratelimit() __printk_ratelimit(__func__) #define printk_ratelimit() __printk_ratelimit(__func__)
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,