From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753021Ab0KXPpK (ORCPT ); Wed, 24 Nov 2010 10:45:10 -0500 Received: from www.tglx.de ([62.245.132.106]:50112 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751845Ab0KXPpI (ORCPT ); Wed, 24 Nov 2010 10:45:08 -0500 Date: Wed, 24 Nov 2010 16:45:03 +0100 (CET) From: Thomas Gleixner To: Mark Brown cc: Arnd Bergmann , linux-kernel@vger.kernel.org Subject: Re: [PATCH] asm-generic: Raise default NR_IRQS when using sparse IRQs In-Reply-To: <1290613156-861-1-git-send-email-broonie@opensource.wolfsonmicro.com> Message-ID: References: <1290613156-861-1-git-send-email-broonie@opensource.wolfsonmicro.com> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 24 Nov 2010, Mark Brown wrote: > Rather than have each platform using sparse IRQs pick a suitably large > NR_IRQS for use with sparse IRQs make the default exceptionally high > when they are enabled. > > Signed-off-by: Mark Brown > --- > include/asm-generic/irq.h | 6 +++++- > 1 files changed, 5 insertions(+), 1 deletions(-) > > diff --git a/include/asm-generic/irq.h b/include/asm-generic/irq.h > index b90ec0b..a76bea2 100644 > --- a/include/asm-generic/irq.h > +++ b/include/asm-generic/irq.h > @@ -4,11 +4,15 @@ > /* > * NR_IRQS is the upper bound of how many interrupts can be handled > * in the platform. It is used to size the static irq_map array, > - * so don't make it too big. > + * so don't make it too big unless we're using sparse IRQs. > */ > #ifndef NR_IRQS > +#ifdef CONFIG_SPARSE_IRQ > +#define NR_IRQS 0x7fffffff Resulting in a 256 MB bitmap. I guess you did not try to boot that on some random ARM board :) Thanks, tglx