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Fix the !SMP case in sched_add() after r355779.

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If the thread's lock is already that of the runqueue, don't recurse on
the queue lock.

Reviewed by:	jeff, kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D23492
This commit is contained in:
Mark Johnston 2020-02-03 22:49:05 +00:00
parent 8151b6e92a
commit e489450589
1 changed files with 7 additions and 5 deletions
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12
sys/kern/sched_ule.c
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@ -2605,15 +2605,17 @@ sched_add(struct thread *td, int flags)
sched_setpreempt(td);
#else
tdq = TDQ_SELF();
TDQ_LOCK(tdq);
/*
* Now that the thread is moving to the run-queue, set the lock
* to the scheduler's lock.
*/
if ((flags & SRQ_HOLD) != 0)
td->td_lock = TDQ_LOCKPTR(tdq);
else
thread_lock_set(td, TDQ_LOCKPTR(tdq));
if (td->td_lock != TDQ_LOCKPTR(tdq)) {
TDQ_LOCK(tdq);
if ((flags & SRQ_HOLD) != 0)
td->td_lock = TDQ_LOCKPTR(tdq);
else
thread_lock_set(td, TDQ_LOCKPTR(tdq));
}
tdq_add(tdq, td, flags);
if (!(flags & SRQ_YIELDING))
sched_setpreempt(td);