From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936531AbWLDSDK (ORCPT ); Mon, 4 Dec 2006 13:03:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S936547AbWLDSDK (ORCPT ); Mon, 4 Dec 2006 13:03:10 -0500 Received: from gateway-1237.mvista.com ([63.81.120.155]:8719 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S936544AbWLDSDI (ORCPT ); Mon, 4 Dec 2006 13:03:08 -0500 Message-ID: <45746338.7050903@ru.mvista.com> Date: Mon, 04 Dec 2006 21:04:40 +0300 From: Sergei Shtylyov Organization: MontaVista Software Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803 X-Accept-Language: ru, en-us, en-gb MIME-Version: 1.0 To: Ingo Molnar Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org, dwalker@mvista.com Subject: Re: [PATCH] 2.6.18-rt7: fix more issues with 32-bit cycles_t in latency_trace.c (take 3) References: <200611132252.58818.sshtylyov@ru.mvista.com> <457326A2.2020402@ru.mvista.com> <20061204095131.GE7872@elte.hu> <4574149B.5070602@ru.mvista.com> In-Reply-To: <4574149B.5070602@ru.mvista.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello. Sergei Shtylyov wrote: >>Why is cycles_t 32-bits on some >>of the arches to begin with? > I guess this was done for speed reasons. The whole 64-bit timebase can't be rad atomically on PPC32. ARM probably has stricter limitations... >> Ingo WBR, Sergei