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=-11.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=ham 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 929D7C433E7 for ; Mon, 12 Oct 2020 14:15:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36F8020776 for ; Mon, 12 Oct 2020 14:15:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731040AbgJLOPc (ORCPT ); Mon, 12 Oct 2020 10:15:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:48782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726724AbgJLOPb (ORCPT ); Mon, 12 Oct 2020 10:15:31 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 026302076E; Mon, 12 Oct 2020 14:15:29 +0000 (UTC) Date: Mon, 12 Oct 2020 10:15:27 -0400 From: Steven Rostedt To: Axel Rasmussen , Tom Zanussi Cc: Ingo Molnar , Andrew Morton , Michel Lespinasse , Vlastimil Babka , Daniel Jordan , Laurent Dufour , Jann Horn , Chinwen Chang , Yafang Shao , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v3 1/2] tracing: support "bool" type in synthetic trace events Message-ID: <20201012101527.6df53dda@gandalf.local.home> In-Reply-To: <20201009220524.485102-2-axelrasmussen@google.com> References: <20201009220524.485102-1-axelrasmussen@google.com> <20201009220524.485102-2-axelrasmussen@google.com> X-Mailer: Claws Mail 3.17.3 (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 Tom, Can you ack this patch for me? -- Steve On Fri, 9 Oct 2020 15:05:23 -0700 Axel Rasmussen wrote: > It's common [1] to define tracepoint fields as "bool" when they contain > a true / false value. Currently, defining a synthetic event with a > "bool" field yields EINVAL. It's possible to work around this by using > e.g. u8 (assuming sizeof(bool) is 1, and bool is unsigned; if either of > these properties don't match, you get EINVAL [2]). > > Supporting "bool" explicitly makes hooking this up easier and more > portable for userspace. > > [1]: grep -r "bool" include/trace/events/ > [2]: check_synth_field() in kernel/trace/trace_events_hist.c > > Acked-by: Michel Lespinasse > Signed-off-by: Axel Rasmussen > --- > kernel/trace/trace_events_synth.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c > index 8e1974fbad0e..8f94c84349a6 100644 > --- a/kernel/trace/trace_events_synth.c > +++ b/kernel/trace/trace_events_synth.c > @@ -234,6 +234,8 @@ static int synth_field_size(char *type) > size = sizeof(long); > else if (strcmp(type, "unsigned long") == 0) > size = sizeof(unsigned long); > + else if (strcmp(type, "bool") == 0) > + size = sizeof(bool); > else if (strcmp(type, "pid_t") == 0) > size = sizeof(pid_t); > else if (strcmp(type, "gfp_t") == 0) > @@ -276,6 +278,8 @@ static const char *synth_field_fmt(char *type) > fmt = "%ld"; > else if (strcmp(type, "unsigned long") == 0) > fmt = "%lu"; > + else if (strcmp(type, "bool") == 0) > + fmt = "%d"; > else if (strcmp(type, "pid_t") == 0) > fmt = "%d"; > else if (strcmp(type, "gfp_t") == 0) > -- > 2.28.0.1011.ga647a8990f-goog