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1 | /* |
2 | * ratelimit.c - Do something with rate limit. |
3 | * |
4 | * Isolated from kernel/printk.c by Dave Young <hidave.darkstar@gmail.com> |
5 | * |
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. |
8 | * |
9 | * This file is released under the GPLv2. |
10 | * |
11 | */ |
12 | |
13 | #include <linux/kernel.h> |
14 | #include <linux/jiffies.h> |
15 | #include <linux/module.h> |
16 | |
17 | static DEFINE_SPINLOCK(ratelimit_lock); |
18 | |
19 | /* |
20 | * __ratelimit - rate limiting |
21 | * @rs: ratelimit_state data |
22 | * |
23 | * This enforces a rate limit: not more than @rs->ratelimit_burst callbacks |
24 | * in every @rs->ratelimit_jiffies |
25 | */ |
26 | int __ratelimit(struct ratelimit_state *rs) |
27 | { |
28 | unsigned long flags; |
29 | |
30 | if (!rs->interval) |
31 | return 1; |
32 | |
33 | spin_lock_irqsave(&ratelimit_lock, flags); |
34 | if (!rs->begin) |
35 | rs->begin = jiffies; |
36 | |
37 | if (time_is_before_jiffies(rs->begin + rs->interval)) { |
38 | if (rs->missed) |
39 | printk(KERN_WARNING "%s: %d callbacks suppressed\n", |
40 | __func__, rs->missed); |
41 | rs->begin = 0; |
42 | rs->printed = 0; |
43 | rs->missed = 0; |
44 | } |
45 | if (rs->burst && rs->burst > rs->printed) |
46 | goto print; |
47 | |
48 | rs->missed++; |
49 | spin_unlock_irqrestore(&ratelimit_lock, flags); |
50 | return 0; |
51 | |
52 | print: |
53 | rs->printed++; |
54 | spin_unlock_irqrestore(&ratelimit_lock, flags); |
55 | return 1; |
56 | } |
57 | EXPORT_SYMBOL(__ratelimit); |
58 |
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