linux-kernel - Re: [PATCH v1] arm64: defconfig: Enable CONFIG

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Message-ID: <ZvWUCtkOXKfnIr-m@arm.com>
Date: Thu, 26 Sep 2024 18:04:10 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Anand Moon <linux.amoon@...il.com>
Cc: Will Deacon <will@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] arm64: defconfig: Enable CONFIG_EXPERT

On Thu, Sep 26, 2024 at 08:28:16PM +0530, Anand Moon wrote:
> Enable CONFIG_EXPERT to allow the configuration of PREEMPT_RT.
> 
> PREEMPT_RT depends on the following configuration:
> 
> CONFIG_PREEMPT_RT
> 	bool “Fully Preemptible Kernel (Real-Time)”
> 	depends on CONFIG_EXPERT && ARCH_SUPPORTS_RT
> 	select PREEMPTION
> 
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>  arch/arm64/configs/defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 5fdbfea7a5b2..3d9d29eb0c13 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -28,6 +28,7 @@ CONFIG_CGROUP_BPF=y
>  CONFIG_USER_NS=y
>  CONFIG_SCHED_AUTOGROUP=y
>  CONFIG_BLK_DEV_INITRD=y
> +CONFIG_EXPERT=y
>  CONFIG_KALLSYMS_ALL=y
>  CONFIG_PROFILING=y
>  CONFIG_KEXEC=y

EXPERT is not really for defconfig (at least not for the arm64 one).
Distros can (and do) enable it if they want. Also PREEMPT_RT is default
off, so you'd have to enable it in your config anyway, not sure what
this patch helps with.

-- 
Catalin