[PATCH 5/5] ARM: Allow to enable RT

[Arnd Bergmann]

On Wed, Oct 29, 2025, at 16:59, Sebastian Andrzej Siewior wrote:
> All known issues have been adressed.
> Allow to select RT.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
> ---
>  arch/arm/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 99c9b1c320af8..002db8da69ee5 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -41,6 +41,7 @@ config ARM
>  	select ARCH_SUPPORTS_CFI
>  	select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE
>  	select ARCH_SUPPORTS_PER_VMA_LOCK
> +	select ARCH_SUPPORTS_RT if HAVE_POSIX_CPU_TIMERS_TASK_WORK
>  	select ARCH_USE_BUILTIN_BSWAP
>  	select ARCH_USE_CMPXCHG_LOCKREF
>  	select ARCH_USE_MEMTEST
> @@ -129,6 +130,7 @@ config ARM
>  	select HAVE_PERF_EVENTS
>  	select HAVE_PERF_REGS
>  	select HAVE_PERF_USER_STACK_DUMP
> +	select HAVE_POSIX_CPU_TIMERS_TASK_WORK if !KVM
>  	select MMU_GATHER_RCU_TABLE_FREE if SMP && ARM_LPAE
>  	select HAVE_REGS_AND_STACK_ACCESS_API
>  	select HAVE_RSEQ

This can be simplified slightly since CONFIG_KVM is long gone on
ARM, so you can just select both HAVE_POSIX_CPU_TIMERS_TASK_WORK
and ARCH_SUPPORTS_RT unconditionally.

      Arnd