linux-kernel - Re: [PATCH] Compile handle_percpu_irq even for uniprocessor kernels

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Date:	Thu, 27 Sep 2007 13:28:59 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Molnar Ingo <mingo@...e.hu>, benh@...nel.crashing.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH] Compile handle_percpu_irq even for uniprocessor kernels


On Thu, 2007-09-27 at 12:24 +0100, Ralf Baechle wrote:
> Compiling handle_percpu_irq only on uniprocessor generates an artificial
> special case so a typical use like:
> 
>   set_irq_chip_and_handler(irq, &some_irq_type, handle_percpu_irq);
> 
> needs to be conditionally compiled only on SMP systems as well and an
> alternative UP construct is usually needed - for no good reason.
> 
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>

Makes sense.

Acked-by: Thomas Gleixner <tglx@...utronix.de>

> ---
> This fixes uniprocessor configurations for some MIPS SMP systems.
> 
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index f1a73f0..9b5dff6 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -503,7 +503,6 @@ out_unlock:
>  	spin_unlock(&desc->lock);
>  }
>  
> -#ifdef CONFIG_SMP
>  /**
>   *	handle_percpu_IRQ - Per CPU local irq handler
>   *	@irq:	the interrupt number
> @@ -529,8 +528,6 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
>  		desc->chip->eoi(irq);
>  }
>  
> -#endif /* CONFIG_SMP */
> -
>  void
>  __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
>  		  const char *name)
> -
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