From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Thu, 4 Feb 2010 20:05:04 +0000
Subject: [RFC PATCH 1/3] [ARM] allow NR_IRQS to be larger than 256
In-Reply-To: <4B6B2030.3040306@xenomai.org>
References: <f17812d71002041109u3d7ea08ej201708fa462e087d@mail.gmail.com>
	<4B6B2030.3040306@xenomai.org>
Message-ID: <20100204200504.GG27344@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thu, Feb 04, 2010 at 08:29:52PM +0100, Gilles Chanteperdrix wrote:
> Eric Miao wrote:
> > -#if NR_IRQS > 256
> > +#if NR_IRQS > 512
> > +#define HARDIRQ_BITS	10
> > +#elif NR_IRQS > 256
> >  #define HARDIRQ_BITS	9
> >  #else
> >  #define HARDIRQ_BITS	8
> 
> Would not it be possible to use
> 
> #define HARDIRQ_BITS order_base_2(NR_IRQS)

HARDIRQ_BITS must be a preprocessor constant.