Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161298AbWHJOxx (ORCPT ); Thu, 10 Aug 2006 10:53:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161289AbWHJOxx (ORCPT ); Thu, 10 Aug 2006 10:53:53 -0400 Received: from mtagate1.uk.ibm.com ([195.212.29.134]:53890 "EHLO mtagate1.uk.ibm.com") by vger.kernel.org with ESMTP id S1161288AbWHJOxw (ORCPT ); Thu, 10 Aug 2006 10:53:52 -0400 Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig From: Martin Schwidefsky Reply-To: schwidefsky@de.ibm.com To: Andy Whitcroft Cc: Dave Hansen , "Luck, Tony" , Andi Kleen , Paul Mackerras , Andrew Morton , "Eric W. Biederman" , "Randy.Dunlap" , "Protasevich, Natalie" , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org In-Reply-To: <44DB4547.80007@shadowen.org> References: <20060807194159.f7c741b5.akpm@osdl.org> <17624.7310.856480.704542@cargo.ozlabs.ibm.com> <200608080714.21151.ak@suse.de> <1155025073.26277.18.camel@localhost> <20060809175854.GA14382@intel.com> <1155147948.19249.171.camel@localhost.localdomain> <1155214538.14749.54.camel@localhost> <44DB4547.80007@shadowen.org> Content-Type: text/plain Organization: IBM Corporation Date: Thu, 10 Aug 2006 16:53:48 +0200 Message-Id: <1155221628.14749.60.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.6.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1000 Lines: 30 On Thu, 2006-08-10 at 15:40 +0100, Andy Whitcroft wrote: > Well you could do something more fun with the top of the address. You > don't need to keep the bytes in the same order for instance. If this > is really a fair size chunk at the bottom and one at the top then > taking the address and swapping the bytes like: > > ABCDEFGH => BCDAEFGH > > Would be a pretty trivial bit of register wibbling (ie very quick), > but would probabally mean a single flat, smaller sparsemem table would > cover all likely areas. Not if you don't know where the objects will be mapped.. -- blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/