Re: [patch 4/5] posix-cpu-timers: Defer timer handling to task_work

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

On Thu, 1 Aug 2019, Peter Zijlstra wrote:
> On Thu, Aug 01, 2019 at 04:32:54PM +0200, Thomas Gleixner wrote:
> > --- a/kernel/time/Kconfig
> > +++ b/kernel/time/Kconfig
> > @@ -52,6 +52,11 @@ config GENERIC_CLOCKEVENTS_MIN_ADJUST
> >  config GENERIC_CMOS_UPDATE
> >  	bool
> >  
> > +# Select to handle posix CPU timers from task_work
> > +# and not from the timer interrupt context
> > +config POSIX_CPU_TIMERS_TASK_WORK
> > +	bool
> > +
> >  if GENERIC_CLOCKEVENTS
> >  menu "Timers subsystem"
> >  
> 
> 
> diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
> index deff97217496..76e37ad5bc31 100644
> --- a/kernel/Kconfig.preempt
> +++ b/kernel/Kconfig.preempt
> @@ -58,6 +58,7 @@ config PREEMPT
>  config PREEMPT_RT
>  	bool "Fully Preemptible Kernel (Real-Time)"
>  	depends on EXPERT && ARCH_SUPPORTS_RT
> +	depends on POSIX_CPU_TIMERS_TASK_WORK

Indeed.