https://github.com/torvalds/linux
Revision 34acae3ce3472f6365d5724252f82032bbc06d63 authored by Linus Torvalds on 21 February 2014, 18:14:15 UTC, committed by Linus Torvalds on 21 February 2014, 18:14:15 UTC
Pull sparc fixes from David Miller: "Three minor fixes from David Howells and Paul Gortmaker" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: Sparc: sparc_cpu_model isn't in asm/system.h any more [ver #2] sparc32: make copy_to/from_user_page() usable from modular code sparc32: fix build failure for arch_jump_label_transform
Tip revision: 34acae3ce3472f6365d5724252f82032bbc06d63 authored by Linus Torvalds on 21 February 2014, 18:14:15 UTC
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Tip revision: 34acae3
ratelimit.c
/*
* ratelimit.c - Do something with rate limit.
*
* Isolated from kernel/printk.c by Dave Young <hidave.darkstar@gmail.com>
*
* 2008-05-01 rewrite the function and use a ratelimit_state data struct as
* parameter. Now every user can use their own standalone ratelimit_state.
*
* This file is released under the GPLv2.
*/
#include <linux/ratelimit.h>
#include <linux/jiffies.h>
#include <linux/export.h>
/*
* __ratelimit - rate limiting
* @rs: ratelimit_state data
* @func: name of calling function
*
* This enforces a rate limit: not more than @rs->burst callbacks
* in every @rs->interval
*
* RETURNS:
* 0 means callbacks will be suppressed.
* 1 means go ahead and do it.
*/
int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
unsigned long flags;
int ret;
if (!rs->interval)
return 1;
/*
* If we contend on this state's lock then almost
* by definition we are too busy to print a message,
* in addition to the one that will be printed by
* the entity that is holding the lock already:
*/
if (!raw_spin_trylock_irqsave(&rs->lock, flags))
return 0;
if (!rs->begin)
rs->begin = jiffies;
if (time_is_before_jiffies(rs->begin + rs->interval)) {
if (rs->missed)
printk(KERN_WARNING "%s: %d callbacks suppressed\n",
func, rs->missed);
rs->begin = 0;
rs->printed = 0;
rs->missed = 0;
}
if (rs->burst && rs->burst > rs->printed) {
rs->printed++;
ret = 1;
} else {
rs->missed++;
ret = 0;
}
raw_spin_unlock_irqrestore(&rs->lock, flags);
return ret;
}
EXPORT_SYMBOL(___ratelimit);
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