quoted hunk ↗ jump to hunk
signed-off-by: Andrew Theurer <redacted>
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fbf1fd0..c767915 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4844,6 +4844,9 @@ bool __sched yield_to(struct task_struct *p, bool
preempt)
again:
p_rq = task_rq(p);
+ if (task_running(p_rq, p) || p->state || !(p_rq->curr->flags &
PF_VCPU)) {
+ goto out_no_unlock;
+ }
double_rq_lock(rq, p_rq);
while (task_rq(p) != p_rq) {
double_rq_unlock(rq, p_rq);@@ -4856,8 +4859,6 @@ again:
if (curr->sched_class != p->sched_class)
goto out;
- if (task_running(p_rq, p) || p->state)
- goto out;
Is it possible that by this time the current thread takes double rq
lock, thread p could actually be running? i.e is there merit to keep
this check around even with your similar check above?
quoted hunk ↗ jump to hunk
yielded = curr->sched_class->yield_to_task(rq, p, preempt);
if (yielded) {@@ -4879,6 +4880,7 @@ again:
out:
double_rq_unlock(rq, p_rq);
+out_no_unlock:
local_irq_restore(flags);
if (yielded)
--
thanks and regards
Srikar