Re: [PATCH 5/7] arm64: Select ARCH_HAS_CPU_RELAX

[Peter Zijlstra]

On Wed, Aug 09, 2023 at 02:39:39PM +0300, Mihai Carabas wrote:
> From: Joao Martins <joao.m.martins@xxxxxxxxxx>
> 
> cpu_relax() is necessary to allow cpuidle poll-state to be used,
> so select it from ARM64 kconfig.
> 
> Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
> Signed-off-by: Mihai Carabas <mihai.carabas@xxxxxxxxxx>
> ---
>  arch/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 87ade6549790..7c47617b5722 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -105,6 +105,7 @@ config ARM64
>  	select ARCH_WANT_LD_ORPHAN_WARN
>  	select ARCH_WANTS_NO_INSTR
>  	select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES
> +	select ARCH_HAS_CPU_RELAX
>  	select ARCH_HAS_UBSAN_SANITIZE_ALL
>  	select ARM_AMBA
>  	select ARM_ARCH_TIMER

Uh what ?! cpu_relax() is assumed present on all archs, no?