From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8667C388F9 for ; Tue, 17 Nov 2020 00:12:55 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 75968221FD for ; Tue, 17 Nov 2020 00:12:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RU3QuFYV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75968221FD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sammy.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:Mime-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3NDu4wHEXfWe64szB0RDDJkuKFm2CZrXhapcFfznaeg=; b=RU3QuFYVfNE677PNMIGSjfk7/ lFGaKgwXmmx93KjgSHaKUGrkculqZ2INdRt+hU2QmmDnDhBvHmpJGPIfLrs0eqEyCFyaftzspIskg bTSbFCfGA3eZrmEQqRp0o2guUb5vAo1CeJUnGDjKHgjwzYtSXIQyWCChNqa3WXfdUVknTf92urKRa eTqCea8/fMG72j3FuRrYv2/OpU0e+TBGsb5prf3HxK5trgDcOdo5EKhoSeEsmFmbWSdojg4WYWOZx 7Ce5Crtt55YomXpalsg91MlMR45MmpmwP8mFpus0kDD+l0rRD9sCfbkQrEY79s+1U0hCFIMsjjvMs y9NunflcA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1keoaa-0000Qj-6Y; Tue, 17 Nov 2020 00:11:16 +0000 Received: from [67.23.44.4] (helo=sammy.net) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1keoaU-0000Pp-Hn for linux-arm-kernel@lists.infradead.org; Tue, 17 Nov 2020 00:11:14 +0000 Received: from sammy by sammy.net with local (Exim 4.63) (envelope-from ) id 1kentn-00010k-IZ; Mon, 16 Nov 2020 18:27:03 -0500 Date: Mon, 16 Nov 2020 18:27:03 -0500 From: Sam Creasey To: Finn Thain Subject: Re: [RFC 13/13] m68k: mac: convert to generic clockevent Message-ID: <20201116232703.GV14088@anhedonia-3> References: <20201008154651.1901126-1-arnd@arndb.de> <20201008154651.1901126-14-arnd@arndb.de> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201116_191110_677506_E8D265DE X-CRM114-Status: GOOD ( 20.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sam Creasey , Arnd Bergmann , Linus Walleij , Tony Luck , Thomas Gleixner , Parisc List , Fenghua Yu , Stephen Boyd , Helge Deller , Daniel Lezcano , "linux-kernel@vger.kernel.org" , Russell King , "James E.J. Bottomley" , "linux-ia64@vger.kernel.org" , Geert Uytterhoeven , Linux ARM , John Stultz , Philip Blundell , linux-m68k , Greg Ungerer , Joshua Thompson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Nov 06, 2020 at 01:52:01PM +1100, Finn Thain wrote: > On Fri, 23 Oct 2020, Geert Uytterhoeven wrote: > > > > > > The arm/rpc timer seems to be roughly in the same category as most > > > > > of the m68k ones or the i8253 counter on a PC. It's possible that > > > > > some of them could use the same logic as > > > > > drivers/clocksource/i8253.o as long as there is any hardware > > > > > oneshot mode. > > > > > > > > There appear to be 15 platforms in that category. 4 have no > > > > clocksource besides the jiffies clocksource, meaning there's no > > > > practical alternative to using a periodic tick, like you did in your > > > > RFC patch: > > > > > > > > arch/m68k/apollo/config.c > > > > arch/m68k/q40/q40ints.c > > > > arch/m68k/sun3/sun3ints.c > > > > arch/m68k/sun3x/time.c > > > > > > Do any of these have users? I'm fairly sure sun3x has never worked in > > > mainline, sun3 seems to still need the same few patches it did 20 > > > years ago. I couldn't find much about Linux on Apollo or q40, the > > > information on the web for either of them seems to all be for > > > linux-2.4 kernels. > > > > They probably don't have any users. > > I have access to several Sun 3 machines but no time to work on that port, > unfortunately. > > Are these 4 platforms (those with no clocksource besides the "jiffies" > clocksource) the only reason for CONFIG_TIME_LOW_RES on m68k? Sun3x was probably at least as close (if not closer) than Sun3 to working in mainline back in the day, but unfortunately I'm in the same place as Finn... I've got the hardware, but time is harder to come by. -- Sam _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel