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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1442EC19F2A for ; Thu, 4 Aug 2022 14:57:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240101AbiHDO5c (ORCPT ); Thu, 4 Aug 2022 10:57:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240091AbiHDO51 (ORCPT ); Thu, 4 Aug 2022 10:57:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF6F21F637 for ; Thu, 4 Aug 2022 07:57:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4500360E09 for ; Thu, 4 Aug 2022 14:57:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56F6FC43147; Thu, 4 Aug 2022 14:57:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1659625044; bh=zW2Uw9CcLUDu0rPEZ2EXejDGYI9S642u10ffHL4EaKo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=CMO9J/0GWDuTTzMdJancXEVLoNw6AVi6eeR88zBaHQ3qutQDYggpNhg+W5hs8Chzy uIWLa65y1CCJ1s9mlunFrRx2FrLSIQXmqoOOVaOYELhwOEQgKzNfx/qp0KgdITvRvf uo3X+bVDdIvKApfzwFWpPUyLhrB4kxkmqEDlZqjfKablDPvcZxaMsiC87+yylN+fm6 3LtjsRNjRs6ILyVG9Y3THdAKO2Wzo+x4ZE8ErVe5eHyxHUVrvLTBkRUL2IeYYbMpuy car9/jVva80Nl0iISOQZbeA3OxaGPmMwcSvRDFnz2/hs9TllriNYfavJuMvzaCO0mj C8u/caRd0iP6w== Date: Thu, 4 Aug 2022 23:57:19 +0900 From: Masami Hiramatsu (Google) To: Steven Rostedt Cc: kernel test robot , "Masami Hiramatsu (Google)" , llvm@lists.linux.dev, kbuild-all@lists.01.org, Tom Zanussi , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] tracing: Add .percent suffix option to histogram values Message-Id: <20220804235719.d9fdd769212455958a721df9@kernel.org> In-Reply-To: <20220802105646.50819088@gandalf.local.home> References: <165932284978.2881436.13536997915615710506.stgit@devnote2> <202208021438.2r5RXlo9-lkp@intel.com> <20220802105646.50819088@gandalf.local.home> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2 Aug 2022 10:56:46 -0400 Steven Rostedt wrote: > On Tue, 2 Aug 2022 14:49:36 +0800 > kernel test robot wrote: > > > All errors (new ones prefixed by >>): > > > > >> ld.lld: error: undefined symbol: __udivdi3 > > This is due to this: > > > @@ -5190,18 +5202,34 @@ static void hist_trigger_print_key(struct seq_file *m, > > seq_puts(m, "}"); > > } > > > > +/* Get the 100 times of the percentage of @val in @total */ > > +static inline unsigned int __get_percentage(u64 val, u64 total) > > +{ > > + if (val < (U64_MAX / 10000)) > > + return (unsigned int)(val * 10000 / total); > > + else > > + return val / (total / 10000); > > +} > > + > > You can't use '/' on u64 values. You have to use div64*(). Otherwise 32 bit > architectures may use floating point operations or glibc helpers. Yeah, I forgot that. And also I have to check "total != 0" here. > > See the other divisions in trace_events_hist.c that do so too. Thanks! > > -- Steve > > > > >>> referenced by trace_events_hist.c:5211 (kernel/trace/trace_events_hist.c:5211) > > >>> trace/trace_events_hist.o:(hist_show) in archive kernel/built-in.a > > >>> referenced by trace_events_hist.c:0 (kernel/trace/trace_events_hist.c:0) > > >>> trace/trace_events_hist.o:(hist_show) in archive kernel/built-in.a > > >>> referenced by trace_events_hist.c:5211 (kernel/trace/trace_events_hist.c:5211) > > >>> trace/trace_events_hist.o:(hist_show) in archive kernel/built-in.a > > >>> referenced 1 more times > -- Masami Hiramatsu (Google)