linux-kernel - RE: [PATCH] provide irq_force_affinity fallback for non-SMP

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Date:	Tue, 06 May 2014 14:02:20 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>,
	'Thomas Gleixner' <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	'Krzysztof Kozlowski' <k.kozlowski@...sung.com>
Subject: RE: [PATCH] provide irq_force_affinity fallback for non-SMP

Arnd Bergmann wrote:
> 
> Patch 01f8fa4f01d "genirq: Allow forcing cpu affinity of interrupts" added
> an irq_force_affinity() function, and 30ccf03b4a6 "clocksource:
Exynos_mct:
> Use irq_force_affinity() in cpu bringup" subsequently uses it. However,
> the
> driver can be used with CONFIG_SMP disabled, but the function declaration
> is only available for CONFIG_SMP, leading to this build error:
> 
> drivers/clocksource/exynos_mct.c:431:3: error: implicit declaration of
> function 'irq_force_affinity' [-Werror=implicit-function-declaration]
>    irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu));
> 
> This patch introduces a dummy helper function for the non-SMP case
> that always returns success, to get rid of the build error.
> Since the patches causing the problem are marked for stable backports,
> this one should be as well.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Arnd, thanks for your fix the build error.

Acked-by: Kukjin Kim <kgene.kim@...sung.com>

- Kukjin

> Cc: stable@...r.kernel.org
> ---
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index 0e6b23f..b72a643 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -272,6 +272,11 @@ static inline int irq_set_affinity(unsigned int irq,
> const struct cpumask *m)
>  	return -EINVAL;
>  }
> 
> +static inline int irq_force_affinity(unsigned int irq, const struct
> cpumask *cpumask)
> +{
> +	return 0;
> +}
> +
>  static inline int irq_can_set_affinity(unsigned int irq)
>  {
>  	return 0;

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