Re: [ANNOUNCE] v5.14-rc4-rt4

[Sebastian Andrzej Siewior]

On 2021-08-04 12:25:41 [-0400], Steven Rostedt wrote:
> On Wed, 4 Aug 2021 18:22:31 +0200
> Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote:
> 
> > no preemption happens here with NEED_RESCHED set.
> 
> But if interrupts were disabled, how would NEED_RESCHED be set? As soon
> as you enable interrupts, the interrupt that sets NEED_RESCHED would
> trigger the preemption.

CPU-local wake-ups just set NEED_RESCHED and wait for preempt_enable()
to do the magic. Just because the code not perform wake_up() now does
not mean it will not do so in the future. Also it is here as an example
which might be copied somewhere else.

> -- Steve

Sebastian