linux-kernel - Re: [PATCH] apic/io_apic.c: Move variable 'desc' into the #ifdef.

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Date:	Mon, 29 Nov 2010 09:34:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thiago Farina <tfransosi@...il.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH] apic/io_apic.c: Move variable 'desc' into the #ifdef.


* Thiago Farina <tfransosi@...il.com> wrote:

> This variable is only used in the presence of the CONFIG_GENERIC_PENDING_IRQ.
> So when compiling without this config, we get the following warning:
> 
> arch/x86/kernel/apic/io_apic.c: In function ‘ack_apic_level’:
> arch/x86/kernel/apic/io_apic.c:2433: warning: unused variable ‘desc’
> 
> Signed-off-by: Thiago Farina <tfransosi@...il.com>
> ---
>  arch/x86/kernel/apic/io_apic.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 7cc0a72..56261be 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -2430,9 +2430,12 @@ static void ack_apic_level(struct irq_data *data)
>  {
>  	struct irq_cfg *cfg = data->chip_data;
>  	int i, do_unmask_irq = 0, irq = data->irq;
> -	struct irq_desc *desc = irq_to_desc(irq);
>  	unsigned long v;
>  
> +#ifdef CONFIG_GENERIC_PENDING_IRQ
> +	struct irq_desc *desc = irq_to_desc(irq);
> +#endif
> +
>  	irq_complete_move(cfg);
>  #ifdef CONFIG_GENERIC_PENDING_IRQ
>  	/* If we are moving the irq we need to mask it */

This is very ugly, and it was ugly before your patch as well.

Please move the bits that are under CONFIG_GENERIC_PENDING_IRQ into a helper inline 
function.

Thanks,

	Ingo
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