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SMP: fix repeat entry timer_start

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If we are running on a single CPU architecture, then we know interrupts
are disabled and there is no need to explicitly call enter_critical_section().
However, in the SMP case, enter_critical_section() is required prevent
multiple cpu to enter timer_start.

Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com>
This commit is contained in:
zhangyuan21 2023-06-08 19:14:44 +08:00 committed by Xiang Xiao
parent 9d3abe8b71
commit 7737efd995
1 changed files with 11 additions and 0 deletions
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11
sched/sched/sched_timerexpiration.c
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@ -601,6 +601,16 @@ void nxsched_timer_expiration(void)
{
unsigned int elapsed;
unsigned int nexttime;
irqstate_t flags;
/* If we are running on a single CPU architecture, then we know interrupts
* are disabled and there is no need to explicitly call
* enter_critical_section(). However, in the SMP case,
* enter_critical_section() is required prevent multiple cpu to enter
* oneshot_tick_start.
*/
flags = enter_critical_section();
/* Get the interval associated with last expiration */
@ -617,6 +627,7 @@ void nxsched_timer_expiration(void)
nexttime = nxsched_timer_process(elapsed, false);
nxsched_timer_start(nexttime);
leave_critical_section(flags);
}
#endif