linux-kernel - Re: [PATCH v2] irqchip: LoongArch: Select GENERIC_IRQ_EFFECTIVE_AFF

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Message-ID: <87v8n1ubbj.wl-maz@kernel.org>
Date:   Sat, 26 Nov 2022 12:53:04 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] irqchip: LoongArch: Select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP

On Thu, 27 Oct 2022 04:39:09 +0100,
Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> 
> An IRQ's effective affinity can only be different from its configured
> affinity if there are multiple CPUs. Make it clear that this option is
> only meaningful when SMP is enabled.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
> 
> v2: rebased on 6.1-rc2
> 
>  drivers/irqchip/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 7ef9f5e..8461915 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -575,7 +575,7 @@ config IRQ_LOONGARCH_CPU
>  	bool
>  	select GENERIC_IRQ_CHIP
>  	select IRQ_DOMAIN
> -	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
> +	select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
>  	select LOONGSON_LIOINTC
>  	select LOONGSON_EIOINTC
>  	select LOONGSON_PCH_PIC

We already have this:

# Supports effective affinity mask
config GENERIC_IRQ_EFFECTIVE_AFF_MASK
       depends on SMP
       bool

Do we really need to express this for every interrupt controller?

	M.

-- 
Without deviation from the norm, progress is not possible.