linux-kernel - Re: [PATCH] irqchip/bcm7038-l1: hide cpu offline callback when building for !SMP

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Date:   Mon, 13 Aug 2018 16:21:48 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Jonas Gorski <jonas.gorski@...il.com>,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Kevin Cernekee <cernekee@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH] irqchip/bcm7038-l1: hide cpu offline callback when
 building for !SMP

On 09/08/18 09:59, Jonas Gorski wrote:
> When compiling bmips with SMP disabled, the build fails with:
> 
> drivers/irqchip/irq-bcm7038-l1.o: In function `bcm7038_l1_cpu_offline':
> drivers/irqchip/irq-bcm7038-l1.c:242: undefined reference to `irq_set_affinity_locked'
> make[5]: *** [vmlinux] Error 1
> 
> Fix this by adding and setting bcm7038_l1_cpu_offline only when actually
> compiling for SMP. It wouldn't have been used anyway, as it requires
> CPU_HOTPLUG, which in turn requires SMP.
> 
> Fixes: 34c535793bcb ("irqchip/bcm7038-l1: Implement irq_cpu_offline() callback")
> Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
> ---
>  drivers/irqchip/irq-bcm7038-l1.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c
> index faf734ff4cf3..0f6e30e9009d 100644
> --- a/drivers/irqchip/irq-bcm7038-l1.c
> +++ b/drivers/irqchip/irq-bcm7038-l1.c
> @@ -217,6 +217,7 @@ static int bcm7038_l1_set_affinity(struct irq_data *d,
>  	return 0;
>  }
>  
> +#ifdef CONFIG_SMP
>  static void bcm7038_l1_cpu_offline(struct irq_data *d)
>  {
>  	struct cpumask *mask = irq_data_get_affinity_mask(d);
> @@ -241,6 +242,7 @@ static void bcm7038_l1_cpu_offline(struct irq_data *d)
>  	}
>  	irq_set_affinity_locked(d, &new_affinity, false);
>  }
> +#endif
>  
>  static int __init bcm7038_l1_init_one(struct device_node *dn,
>  				      unsigned int idx,
> @@ -293,7 +295,9 @@ static struct irq_chip bcm7038_l1_irq_chip = {
>  	.irq_mask		= bcm7038_l1_mask,
>  	.irq_unmask		= bcm7038_l1_unmask,
>  	.irq_set_affinity	= bcm7038_l1_set_affinity,
> +#ifdef CONFIG_SMP
>  	.irq_cpu_offline	= bcm7038_l1_cpu_offline,
> +#endif
>  };
>  
>  static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
> 

Queued, thanks.

	M.
-- 
Jazz is not dead. It just smells funny...