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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 14 Aug 2018 14:41:29 -0400 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 w7EIfSNg11010580 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 14 Aug 2018 18:41:28 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 20DADB206A; Tue, 14 Aug 2018 14:40:44 -0400 (EDT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 028D9B2065; Tue, 14 Aug 2018 14:40:43 -0400 (EDT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.159]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 14 Aug 2018 14:40:43 -0400 (EDT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id 4F44016C3A72; Tue, 14 Aug 2018 11:41:29 -0700 (PDT) Date: Tue, 14 Aug 2018 11:41:29 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: joel@joelfernandes.org, mathieu.desnoyers@efficios.com, peterz@infradead.org, tj@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] Make call_srcu() available during very early boot Reply-To: paulmck@linux.vnet.ibm.com References: <20180814162448.GA20414@linux.vnet.ibm.com> <20180814124945.5cf1753f@gandalf.local.home> <20180814170618.GA24813@linux.vnet.ibm.com> <20180814132453.093a4921@gandalf.local.home> <20180814174443.GG24813@linux.vnet.ibm.com> <20180814143451.0ee99bf8@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180814143451.0ee99bf8@gandalf.local.home> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 18081418-0052-0000-0000-0000031EF87D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009544; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01073502; UDB=6.00553133; IPR=6.00853460; MB=3.00022716; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-14 18:41:30 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18081418-0053-0000-0000-00005DB9B675 Message-Id: <20180814184129.GK24813@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-14_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=838 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808140190 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 14, 2018 at 02:34:51PM -0400, Steven Rostedt wrote: > On Tue, 14 Aug 2018 10:44:43 -0700 > "Paul E. McKenney" wrote: > > > > > If I recall correctly, this subterfuge suppresses compiler complaints > > > > about initializing an unsigned long with a negative number. :-/ > > > > > > Did you try: > > > > > > .srcu_gp_seq_needed = -1UL, > > > > > > ? > > > > Works for my compiler, not sure what set of complaints pushed me in that > > direction. > > I've used -1UL for unsigned long initializations for pretty much my > entire programming career. I've never had any issues with it. Fair enough. I have to fix a "void void" that my compilers were happy with, so might as well do this one also. "I am telling you, don't even -think- about expecting a return value from -this- function!!!" ;-) Thanx, Paul