Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp976280imu; Thu, 13 Dec 2018 07:29:55 -0800 (PST) X-Google-Smtp-Source: AFSGD/XvYBQPlreDvhoL5afg5zZRIamHRxyolltGYE4UGpbrk75hzd+/Y22BqcEolmF2y0rNlals X-Received: by 2002:a65:5387:: with SMTP id x7mr22371514pgq.412.1544714995838; Thu, 13 Dec 2018 07:29:55 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1544714995; cv=none; d=google.com; s=arc-20160816; b=jAhEsfBwwJQ4WTBFsB+FNlEfn5pZUX5FSpg7ZvsRuuXRT7aocxvOIUZ474Hm+eB19u D99shFUcANfqTxcZyaArFbc3EuT/a689EjfOMobBIrq4Yws+gueEPJcI4V9rzYDSTAAK smn5dw51pz+56hV1ZkNte5u+WKaORwC5k9JOAk19/YAaNHdpon4zl60QzX101AOI0h9T xh1lwa90HalUhGuT5VVo8sF2Si2yCJzXlvY4C2FJsXjBbpGL9e2+TCsj/PePvPf+jikW NKi/mPepR8hc3I90I+sKLYB9IPfP9i/FOUpa3m9pshHpqm5jxpaCxewMcrpdnHwg3pEp M0Vg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:user-agent:in-reply-to :content-disposition:mime-version:references:reply-to:subject:cc:to :from:date; bh=xE6dPJfOgnSAlxhImBvkcZEpLBsCsObrZ2XS+jx9Gko=; b=r5c/5C1A+5Nt8ctS6hr4qmS7oMy3nlf8MIpZDsuXn5yUQED+w+yKvPIfkAbWTLKJre uGc6Sx0ne9l1M7a+dVvQTll+XWM1Mq0Wd3R9L+xnRB31ZXebZGqAZKx/bb/j8YKhzB8h v0Dcb9AKGt1mEUdmV04fnvET4jzR4VtDsNqtYzxPcM+JhW+ovV9odehC/+kqDwc+gnwD D6f57aFu3KjsA6Lsp1w7aEjbr1bMM7y91jM8RJ7skh5AkwlD8ORwuC330hvTMEAL/Pgh E3eEyB6yqnX6icCh6zIaPphW2z05NSFY8kLEtM+1Z7Ltx4Rq8RBEtpGUFnaRY+bMYFna jp6Q== ARC-Authentication-Results: i=1; mx.google.com; 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=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l8si1779764pgr.345.2018.12.13.07.29.40; Thu, 13 Dec 2018 07:29:55 -0800 (PST) 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; 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=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729687AbeLMP1C (ORCPT + 99 others); Thu, 13 Dec 2018 10:27:02 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:36512 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729510AbeLMP1C (ORCPT ); Thu, 13 Dec 2018 10:27:02 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wBDFIlOU144913 for ; Thu, 13 Dec 2018 10:27:00 -0500 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0b-001b2d01.pphosted.com with ESMTP id 2pbqb2h85w-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 13 Dec 2018 10:27:00 -0500 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 13 Dec 2018 15:26:59 -0000 Received: from b01cxnp22033.gho.pok.ibm.com (9.57.198.23) by e11.ny.us.ibm.com (146.89.104.198) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 13 Dec 2018 15:26:55 -0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBDFQsiS20316260 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 13 Dec 2018 15:26:54 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1FF26B2068; Thu, 13 Dec 2018 15:26:54 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F3174B206C; Thu, 13 Dec 2018 15:26:53 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.38]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 13 Dec 2018 15:26:53 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id EE9F916C0720; Thu, 13 Dec 2018 07:26:53 -0800 (PST) Date: Thu, 13 Dec 2018 07:26:53 -0800 From: "Paul E. McKenney" To: Sebastian Andrzej Siewior Cc: Boqun Feng , Joel Fernandes , linux-kernel@vger.kernel.org, Lai Jiangshan , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , tglx@linutronix.de, tj@kernel.org Subject: Re: [PATCH] srcu: Remove srcu_queue_delayed_work_on() Reply-To: paulmck@linux.ibm.com References: <20181211111238.13474-1-bigeasy@linutronix.de> <20181212014016.GA97542@google.com> <20181212140519.GA10937@tardis> <20181213150358.bgrwgpp5am5w53ie@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181213150358.bgrwgpp5am5w53ie@linutronix.de> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 18121315-2213-0000-0000-0000032A5693 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010219; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000271; SDB=6.01131216; UDB=6.00587873; IPR=6.00911347; MB=3.00024681; MTD=3.00000008; XFM=3.00000015; UTC=2018-12-13 15:26:58 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18121315-2214-0000-0000-00005C97034A Message-Id: <20181213152653.GJ4170@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-13_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812130133 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 13, 2018 at 04:03:58PM +0100, Sebastian Andrzej Siewior wrote: > On 2018-12-12 22:05:19 [+0800], Boqun Feng wrote: > > So Jiangshan and TJ, what's your opion on this one? If we call a > > queue_work_on() at a place where that target cpu may be offlined, I > > think we have the guarantee that the work will be eventually executed > > even if the cpu is never online again, right? In other words, if a cpu > > has been online once, queue_work_on() on it will be free from racing > > with cpu hotplug. > > > > Am I right about this, or did I miss something subtle? > > tj answered this one: > https://lkml.kernel.org/r/20180919205521.GE902964@devbig004.ftw2.facebook.com I must confess that I would have felt better about that email had it been more definite than "is might just work already". ;-) Thanx, Paul