mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 06:50:37 +00:00
cf8cfa8a99
Retain the locked design, but check rate-limiting even when the lock could not be acquired. Link: https://lore.kernel.org/all/Z_VRo63o2UsVoxLG@pathway.suse.cz/ Link: https://lore.kernel.org/all/fbe93a52-365e-47fe-93a4-44a44547d601@paulmck-laptop/ Link: https://lore.kernel.org/all/20250423115409.3425-1-spasswolf@web.de/ Signed-off-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kuniyuki Iwashima <kuniyu@amazon.com> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: John Ogness <john.ogness@linutronix.de> Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_RATELIMIT_H
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#define _LINUX_RATELIMIT_H
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#include <linux/ratelimit_types.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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static inline void ratelimit_state_init(struct ratelimit_state *rs,
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int interval, int burst)
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{
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memset(rs, 0, sizeof(*rs));
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raw_spin_lock_init(&rs->lock);
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rs->interval = interval;
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rs->burst = burst;
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}
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static inline void ratelimit_default_init(struct ratelimit_state *rs)
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{
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return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
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DEFAULT_RATELIMIT_BURST);
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}
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static inline void ratelimit_state_inc_miss(struct ratelimit_state *rs)
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{
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atomic_inc(&rs->missed);
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}
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static inline int ratelimit_state_get_miss(struct ratelimit_state *rs)
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{
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return atomic_read(&rs->missed);
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}
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static inline int ratelimit_state_reset_miss(struct ratelimit_state *rs)
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{
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return atomic_xchg_relaxed(&rs->missed, 0);
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}
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static inline void ratelimit_state_reset_interval(struct ratelimit_state *rs, int interval_init)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&rs->lock, flags);
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rs->interval = interval_init;
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rs->flags &= ~RATELIMIT_INITIALIZED;
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atomic_set(&rs->rs_n_left, rs->burst);
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ratelimit_state_reset_miss(rs);
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raw_spin_unlock_irqrestore(&rs->lock, flags);
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}
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static inline void ratelimit_state_exit(struct ratelimit_state *rs)
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{
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int m;
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if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
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return;
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m = ratelimit_state_reset_miss(rs);
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if (m)
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pr_warn("%s: %d output lines suppressed due to ratelimiting\n", current->comm, m);
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}
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static inline void
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ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
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{
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rs->flags = flags;
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}
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extern struct ratelimit_state printk_ratelimit_state;
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#ifdef CONFIG_PRINTK
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#define WARN_ON_RATELIMIT(condition, state) ({ \
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bool __rtn_cond = !!(condition); \
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WARN_ON(__rtn_cond && __ratelimit(state)); \
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__rtn_cond; \
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})
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#define WARN_RATELIMIT(condition, format, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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int rtn = !!(condition); \
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\
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if (unlikely(rtn && __ratelimit(&_rs))) \
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WARN(rtn, format, ##__VA_ARGS__); \
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\
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rtn; \
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})
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#else
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#define WARN_ON_RATELIMIT(condition, state) \
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WARN_ON(condition)
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#define WARN_RATELIMIT(condition, format, ...) \
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({ \
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int rtn = WARN(condition, format, ##__VA_ARGS__); \
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rtn; \
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})
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#endif
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#endif /* _LINUX_RATELIMIT_H */
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