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Date:   Wed, 9 Aug 2023 15:49:41 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Mihai Carabas <mihai.carabas@oracle.com>
Cc:     Joao Martins <joao.m.martins@oracle.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
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Subject: Re: [PATCH 5/7] arm64: Select ARCH_HAS_CPU_RELAX
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 <1691581193-8416-6-git-send-email-mihai.carabas@oracle.com>
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On Wed, Aug 09, 2023 at 02:39:39PM +0300, Mihai Carabas wrote:
> From: Joao Martins <joao.m.martins@oracle.com>
> 
> 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@oracle.com>
> Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
> ---
>  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?