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[209.132.180.67]) by mx.google.com with ESMTP id q2si4066972pjq.31.2019.08.16.18.26.52; Fri, 16 Aug 2019 18:27:19 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@efficios.com header.s=default header.b=IrCxEl6d; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=efficios.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726023AbfHQBZb (ORCPT + 99 others); Fri, 16 Aug 2019 21:25:31 -0400 Received: from mail.efficios.com ([167.114.142.138]:54690 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725829AbfHQBZb (ORCPT ); Fri, 16 Aug 2019 21:25:31 -0400 Received: from localhost (ip6-localhost [IPv6:::1]) by mail.efficios.com (Postfix) with ESMTP id 1EA582C859D; Fri, 16 Aug 2019 21:25:30 -0400 (EDT) Received: from mail.efficios.com ([IPv6:::1]) by localhost (mail02.efficios.com [IPv6:::1]) (amavisd-new, port 10032) with ESMTP id BdC3s7WjZEA9; Fri, 16 Aug 2019 21:25:29 -0400 (EDT) Received: from localhost (ip6-localhost [IPv6:::1]) by mail.efficios.com (Postfix) with ESMTP id 963FC2C859A; Fri, 16 Aug 2019 21:25:29 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 963FC2C859A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1566005129; bh=uqTIy28oWerSplIYIKuIISlO9VobuclwHz+JaXKqcuc=; h=Date:From:To:Message-ID:MIME-Version; b=IrCxEl6dTs2A22BzAKsFarTyrZi5ILrUMtVN/FUyA8Ij4bn9zNILQrBWlCPsmmkNg 44J2P5i6oSLq2YRU7UvLNQ1wEQZ8gDBy3SSjnv7xM+Jyd389nNp46Jpx7cHHInbE/6 NoeScMvJjV9KNR/N5gfyaQAV26MxQon3IYucZ9eXvPkmNJr0hspJ0Wf68N5+K71I/m m7tJaLo9E1mFeOi9YKEkHdjbgG/C+EIGowKnVzHqfxeHDK3EuPxaJJP6DMym2Wr5we s4BBs57eb59WOy5oBU8R4zpcu5WS2wd24eNv4/Ovs+dZt8T8QFcocS59DMK6aRS+Eb ao68k9QN/DB1Q== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([IPv6:::1]) by localhost (mail02.efficios.com [IPv6:::1]) (amavisd-new, port 10026) with ESMTP id A_JMzfzV7V3T; Fri, 16 Aug 2019 21:25:29 -0400 (EDT) Received: from mail02.efficios.com (mail02.efficios.com [167.114.142.138]) by mail.efficios.com (Postfix) with ESMTP id 769072C8591; Fri, 16 Aug 2019 21:25:29 -0400 (EDT) Date: Fri, 16 Aug 2019 21:25:29 -0400 (EDT) From: Mathieu Desnoyers To: rostedt Cc: "Joel Fernandes, Google" , Alan Stern , Valentin Schneider , linux-kernel , Peter Zijlstra , Thomas Gleixner , paulmck , Boqun Feng , Will Deacon , David Howells , Linus Torvalds Message-ID: <1209741234.23376.1566005129181.JavaMail.zimbra@efficios.com> In-Reply-To: <20190816164912.078b6e01@oasis.local.home> References: <241506096.21688.1565977319832.JavaMail.zimbra@efficios.com> <20190816164912.078b6e01@oasis.local.home> Subject: Re: [PATCH 1/1] Fix: trace sched switch start/stop racy updates MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [167.114.142.138] X-Mailer: Zimbra 8.8.15_GA_3829 (ZimbraWebClient - FF68 (Linux)/8.8.15_GA_3829) Thread-Topic: trace sched switch start/stop racy updates Thread-Index: nbfLwy+5lp4uRgruZUREyYMsesqZmA== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- On Aug 16, 2019, at 4:49 PM, rostedt rostedt@goodmis.org wrote: > On Fri, 16 Aug 2019 16:44:10 -0400 > Joel Fernandes wrote: > > >> I am also more on the side of using *_ONCE. To me, by principal, I >> would be willing to convert any concurrent plain access using _ONCE, >> just so we don't have to worry about it now or in the future and also >> documents the access. >> >> Perhaps the commit message can be reworded to mention that the _ONCE >> is an additional clean up for safe access. > > The most I'll take is two separate patches. One is going to be marked > for stable as it fixes a real bug. The other is more for cosmetic or > theoretical issues, that I will state clearly "NOT FOR STABLE", such > that the autosel doesn't take them. Splitting this into two separate patches makes perfect sense. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com