linux-kernel - Re: [PATCH] asm-generic: hard_irqs: handle NR

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Message-ID: <4A33E892.6010704@zytor.com>
Date:	Sat, 13 Jun 2009 10:57:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Frysinger <vapier@...too.org>
CC:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] asm-generic: hard_irqs: handle NR_IRQS > 256 automatically

Mike Frysinger wrote:
> If we're going to automatically set HARDIRQ_BITS for the arch, might as
> well be a little bit smart about it and set it to 9 automatically if
> NR_IRQS is larger than 8 bits.
> 

Why would the only possible values be 8 or 9?

>  
>  #ifndef HARDIRQ_BITS
> -#define HARDIRQ_BITS	8
> +# if NR_IRQS > 256
> +#  define HARDIRQ_BITS	9
> +# else
> +#  define HARDIRQ_BITS	8
> +# endif
>  #endif
>  
>  /*

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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