1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_RATELIMIT_H
#define _LINUX_RATELIMIT_H
#include <linux/ratelimit_types.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
static inline void ratelimit_state_init(struct ratelimit_state *rs,
int interval, int burst)
{
memset(rs, 0, sizeof(*rs));
raw_spin_lock_init(&rs->lock);
rs->interval = interval;
rs->burst = burst;
}
static inline void ratelimit_default_init(struct ratelimit_state *rs)
{
return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
}
static inline void ratelimit_state_inc_miss(struct ratelimit_state *rs)
{
atomic_inc(&rs->missed);
}
static inline int ratelimit_state_get_miss(struct ratelimit_state *rs)
{
return atomic_read(&rs->missed);
}
static inline int ratelimit_state_reset_miss(struct ratelimit_state *rs)
{
return atomic_xchg_relaxed(&rs->missed, 0);
}
static inline void ratelimit_state_reset_interval(struct ratelimit_state *rs, int interval_init)
{
unsigned long flags;
raw_spin_lock_irqsave(&rs->lock, flags);
rs->interval = interval_init;
rs->flags &= ~RATELIMIT_INITIALIZED;
atomic_set(&rs->rs_n_left, rs->burst);
ratelimit_state_reset_miss(rs);
raw_spin_unlock_irqrestore(&rs->lock, flags);
}
static inline void ratelimit_state_exit(struct ratelimit_state *rs)
{
int m;
if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
return;
m = ratelimit_state_reset_miss(rs);
if (m)
pr_warn("%s: %d output lines suppressed due to ratelimiting\n", current->comm, m);
}
static inline void
ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
{
rs->flags = flags;
}
extern struct ratelimit_state printk_ratelimit_state;
#ifdef CONFIG_PRINTK
#define WARN_ON_RATELIMIT(condition, state) ({ \
bool __rtn_cond = !!(condition); \
WARN_ON(__rtn_cond && __ratelimit(state)); \
__rtn_cond; \
})
#define WARN_RATELIMIT(condition, format, ...) \
({ \
static DEFINE_RATELIMIT_STATE(_rs, \
DEFAULT_RATELIMIT_INTERVAL, \
DEFAULT_RATELIMIT_BURST); \
int rtn = !!(condition); \
\
if (unlikely(rtn && __ratelimit(&_rs))) \
WARN(rtn, format, ##__VA_ARGS__); \
\
rtn; \
})
#else
#define WARN_ON_RATELIMIT(condition, state) \
WARN_ON(condition)
#define WARN_RATELIMIT(condition, format, ...) \
({ \
int rtn = WARN(condition, format, ##__VA_ARGS__); \
rtn; \
})
#endif
#endif /* _LINUX_RATELIMIT_H */
|
