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rcuwait: Support timeouts

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The rcuwait utility provides an efficient and safe single
wait/wake mechanism. It is used in situations where queued
wait is the wrong semantics, and often too bulky. For example,
cases where the wait is already done under a lock.

In the past, rcuwait has been extended to support beyond only
uninterruptible sleep, and similarly, there are users that can
benefit for the addition of timeouts.

As such, tntroduce rcuwait_wait_event_timeout(), with semantics
equivalent to calls for queued wait counterparts.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20230523170927.20685-2-dave@stgolabs.net
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Davidlohr Bueso 2023-05-23 10:09:24 -07:00 committed by Dan Williams
parent a70fc4ed20
commit f6239d3f8c
1 changed files with 20 additions and 3 deletions
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23
include/linux/rcuwait.h
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@ -49,9 +49,9 @@ static inline void prepare_to_rcuwait(struct rcuwait *w)
extern void finish_rcuwait(struct rcuwait *w);
#define rcuwait_wait_event(w, condition, state) \
#define ___rcuwait_wait_event(w, condition, state, ret, cmd) \
({ \
int __ret = 0; \
long __ret = ret; \
prepare_to_rcuwait(w); \
for (;;) { \
/* \
@ -67,10 +67,27 @@ extern void finish_rcuwait(struct rcuwait *w);
break; \
} \
\
schedule(); \
cmd; \
} \
finish_rcuwait(w); \
__ret; \
})
#define rcuwait_wait_event(w, condition, state) \
___rcuwait_wait_event(w, condition, state, 0, schedule())
#define __rcuwait_wait_event_timeout(w, condition, state, timeout) \
___rcuwait_wait_event(w, ___wait_cond_timeout(condition), \
state, timeout, \
__ret = schedule_timeout(__ret))
#define rcuwait_wait_event_timeout(w, condition, state, timeout) \
({ \
long __ret = timeout; \
if (!___wait_cond_timeout(condition)) \
__ret = __rcuwait_wait_event_timeout(w, condition, \
state, timeout); \
__ret; \
})
#endif /* _LINUX_RCUWAIT_H_ */