]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - lib/ratelimit.c
2 * ratelimit.c - Do something with rate limit.
4 * Isolated from kernel/printk.c by Dave Young <hidave.darkstar@gmail.com>
6 * 2008-05-01 rewrite the function and use a ratelimit_state data struct as
7 * parameter. Now every user can use their own standalone ratelimit_state.
9 * This file is released under the GPLv2.
12 #include <linux/ratelimit.h>
13 #include <linux/jiffies.h>
14 #include <linux/module.h>
17 * __ratelimit - rate limiting
18 * @rs: ratelimit_state data
19 * @func: name of calling function
21 * This enforces a rate limit: not more than @rs->burst callbacks
22 * in every @rs->interval
25 * 0 means callbacks will be suppressed.
26 * 1 means go ahead and do it.
28 int ___ratelimit(struct ratelimit_state
*rs
, const char *func
)
37 * If we contend on this state's lock then almost
38 * by definition we are too busy to print a message,
39 * in addition to the one that will be printed by
40 * the entity that is holding the lock already:
42 if (!spin_trylock_irqsave(&rs
->lock
, flags
))
48 if (time_is_before_jiffies(rs
->begin
+ rs
->interval
)) {
50 printk(KERN_WARNING
"%s: %d callbacks suppressed\n",
56 if (rs
->burst
&& rs
->burst
> rs
->printed
) {
63 spin_unlock_irqrestore(&rs
->lock
, flags
);
67 EXPORT_SYMBOL(___ratelimit
);