From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754441Ab1IRGc0 (ORCPT ); Sun, 18 Sep 2011 02:32:26 -0400 Received: from mail-iy0-f174.google.com ([209.85.210.174]:49182 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751580Ab1IRGbU (ORCPT ); Sun, 18 Sep 2011 02:31:20 -0400 Date: Sun, 18 Sep 2011 00:24:02 -0600 From: Grant Likely To: Rob Herring Cc: linux-arm-kernel@lists.infradead.org, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, marc.zyngier@arm.com, thomas.abraham@linaro.org, jamie@jamieiles.com, b-cousson@ti.com, shawn.guo@linaro.org, Rob Herring Subject: Re: [PATCH 4/5] ARM: gic: allow irq_start to be 0 Message-ID: <20110918062402.GG3523@ponder.secretlab.ca> References: <1316017900-19918-1-git-send-email-robherring2@gmail.com> <1316017900-19918-5-git-send-email-robherring2@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1316017900-19918-5-git-send-email-robherring2@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 14, 2011 at 11:31:39AM -0500, Rob Herring wrote: > From: Rob Herring > > There's really no need to set irq_start per platform for the primary gic. > The SGIs and PPIs are not handled as normal irqs, so how irqs 0-31 are > setup doesn't really matter. So allow irq_start to be set to 0 to match > the linux irq numbering. Is this really what you want? Linux irq 0 is not supposed to be used. With the transition to dynamically allocated irq_descs, I want to make sure 0 never gets assigned. g. > > Signed-off-by: Rob Herring > --- > arch/arm/common/gic.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c > index 666b278..d1ccc72 100644 > --- a/arch/arm/common/gic.c > +++ b/arch/arm/common/gic.c > @@ -359,7 +359,7 @@ void __init gic_init(unsigned int gic_nr, unsigned int irq_start, > gic = &gic_data[gic_nr]; > gic->dist_base = dist_base; > gic->cpu_base = cpu_base; > - gic->irq_offset = (irq_start - 1) & ~31; > + gic->irq_offset = irq_start ? (irq_start - 1) & ~31 : 0; > > if (gic_nr == 0) > gic_cpu_base_addr = cpu_base; > -- > 1.7.5.4 >