linux-kernel - Re: [PATCH] irqchip/stm32: fix non-SMP build warning

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Message-ID: <1db5308c-7f53-112f-97dc-160ec2747887@st.com>
Date:   Tue, 5 Jun 2018 13:59:49 +0200
From:   Ludovic BARRE <ludovic.barre@...com>
To:     Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     Rob Herring <robh@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Radoslaw Pietrzyk <radoslaw.pietrzyk@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] irqchip/stm32: fix non-SMP build warning



On 06/05/2018 01:43 PM, Arnd Bergmann wrote:
> Without CONFIG_SMP, we get a harmless compile-time warning:
> 
> drivers/irqchip/irq-stm32-exti.c:495:12: error: 'stm32_exti_h_set_affinity' defined but not used [-Werror=unused-function]
> 
> The #ifdef is inconsistent here, and it's better to use an IS_ENABLED() check
> that lets the compiler silently drop that function.
> 
> Fixes: 927abfc4461e ("irqchip/stm32: Add stm32mp1 support with hierarchy domain")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/irqchip/irq-stm32-exti.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
> index 5089c1e2838d..3a7e8905a97e 100644
> --- a/drivers/irqchip/irq-stm32-exti.c
> +++ b/drivers/irqchip/irq-stm32-exti.c
> @@ -552,9 +552,7 @@ static struct irq_chip stm32_exti_h_chip = {
>   	.irq_set_type		= stm32_exti_h_set_type,
>   	.irq_set_wake		= stm32_exti_h_set_wake,
>   	.flags			= IRQCHIP_MASK_ON_SUSPEND,
> -#ifdef CONFIG_SMP
> -	.irq_set_affinity	= stm32_exti_h_set_affinity,
> -#endif
> +	.irq_set_affinity	= IS_ENABLED(CONFIG_SMP) ? stm32_exti_h_set_affinity : NULL,

thanks Arnd, sorry to forgotten config flag test

Reviewed-by: Ludovic Barre <ludovic.barre@...com>

>   };
>   
>   static int stm32_exti_h_domain_alloc(struct irq_domain *dm,
>