Re: [PATCH sched/core] sched/rt: Fix RT_PUSH_IPI soft lockup loop

[Tejun Heo]

Hello,

Looking at 49bef33e4b87 ("sched/rt: Plug rt_mutex_setprio() vs
push_rt_task() race"), the prio bail looks like it was already there
and only got moved up to retry:. For non-migration-disabled next_task
the bail fires at the same effective point both before and after, and
rto_push_irq_work_func() + rto_next_cpu() were already in their
current shape, so the loop seems reachable before the move too -
b6366f048e0c ("sched/rt: Use IPI to trigger RT task push migration
instead of pulling") looks like the actual origin.

Am I reading it wrong?

Thanks.

--
tejun