linux-kernel - Re: [PATCH] x86, acpi/irq: Minor readability cleanup of gsi_to

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Date:	Fri, 30 Mar 2012 00:15:05 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, acpi/irq: Minor readability cleanup of gsi_to_irq()

Alexander Gordeev <agordeev@...hat.com> writes:

> Init value of 'irq' variable is never used. So do not initialize it.

Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>

> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> ---

Looks good to me.    I was going to ask what idiot wrote that silly
thing but it appears that idiot was me.    I must have rewritten
the function and forgotten to cleanup that initial assignment to irq.

That change makes it much clearer what is going on thank you.

Eric

>  arch/x86/kernel/acpi/boot.c |   10 ++++------
>  1 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index 406ed77..f148557 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -103,13 +103,11 @@ static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
>  
>  static unsigned int gsi_to_irq(unsigned int gsi)
>  {
> -	unsigned int irq = gsi + NR_IRQS_LEGACY;
> -	unsigned int i;
> +	unsigned int irq;
>  
> -	for (i = 0; i < NR_IRQS_LEGACY; i++) {
> -		if (isa_irq_to_gsi[i] == gsi) {
> -			return i;
> -		}
> +	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
> +		if (isa_irq_to_gsi[irq] == gsi)
> +			return irq;
>  	}
>  
>  	/* Provide an identity mapping of gsi == irq
--
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