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

[Peter Zijlstra]

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
 	select PREEMPTION
 	help
 	  This option turns the kernel into a real-time kernel by replacing