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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 21 Jun 2019 14:34:14 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5LDYD4M48496984 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 21 Jun 2019 13:34:13 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3A85B206B; Fri, 21 Jun 2019 13:34:13 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B4320B205F; Fri, 21 Jun 2019 13:34:13 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.85.175.77]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 21 Jun 2019 13:34:13 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id 4269E16C1D2F; Fri, 21 Jun 2019 06:34:14 -0700 (PDT) Date: Fri, 21 Jun 2019 06:34:14 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, frederic@kernel.org, tglx@linutronix.de Subject: Re: [PATCH] time/tick-broadcast: Fix tick_broadcast_offline() lockdep complaint Reply-To: paulmck@linux.ibm.com References: <20190619181903.GA14233@linux.ibm.com> <20190620121032.GU3436@hirez.programming.kicks-ass.net> <20190620160118.GQ26519@linux.ibm.com> <20190620211019.GA3436@hirez.programming.kicks-ass.net> <20190620221336.GZ26519@linux.ibm.com> <20190621105503.GI3436@hirez.programming.kicks-ass.net> <20190621121630.GE26519@linux.ibm.com> <20190621122927.GV3402@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190621122927.GV3402@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19062113-2213-0000-0000-000003A2729B X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011302; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01221194; UDB=6.00642471; IPR=6.01002333; MB=3.00027407; MTD=3.00000008; XFM=3.00000015; UTC=2019-06-21 13:34:16 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19062113-2214-0000-0000-00005EF0A80C Message-Id: <20190621133414.GF26519@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-21_09:,, 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=913 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906210113 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 21, 2019 at 02:29:27PM +0200, Peter Zijlstra wrote: > On Fri, Jun 21, 2019 at 05:16:30AM -0700, Paul E. McKenney wrote: > > A pair of full hangs at boot (TASKS03 and TREE04), no console output > > whatsoever. Not sure how these changes could cause that, but suspicion > > falls on sched_tick_offload_init(). Though even that is a bit strange > > because if so, why didn't TREE01 and TREE07 also hang? Again, looking > > into it. > > Pesky details ;-) And backing out to the earlier patch removes the hangs, though statistical insignificance and all that. Ah, in answer to your earlier question, if you want it in v5.3, you will need to take it (but I do humbly request that you wait until it actually works). If you don't take it, I won't be submitting it earlier than v5.4. Either way, your choice! Thanx, Paul