From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from imap.sh.mvista.com (unknown [63.81.120.155]) by ozlabs.org (Postfix) with ESMTP id 0815D67BD5 for ; Tue, 5 Dec 2006 05:03:12 +1100 (EST) Message-ID: <45746338.7050903@ru.mvista.com> Date: Mon, 04 Dec 2006 21:04:40 +0300 From: Sergei Shtylyov MIME-Version: 1.0 To: Ingo Molnar 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 Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org, dwalker@mvista.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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