From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751788AbdIUKi4 (ORCPT ); Thu, 21 Sep 2017 06:38:56 -0400 Received: from mga02.intel.com ([134.134.136.20]:49392 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751754AbdIUKiz (ORCPT ); Thu, 21 Sep 2017 06:38:55 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,425,1500966000"; d="scan'208";a="1197532438" Date: Thu, 21 Sep 2017 18:38:19 +0800 From: kbuild test robot To: Rohit Jain Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org, eas-dev@lists.linaro.org, peterz@infradead.org, mingo@redhat.com, joelaf@google.com Subject: Re: [PATCH 1/2] sched: Introduce new flags to sched_setaffinity to support soft affinity. Message-ID: <201709211812.jEuJhbME%fengguang.wu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1505860632-11275-2-git-send-email-rohit.k.jain@oracle.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: fengguang.wu@intel.com X-SA-Exim-Scanned: No (on bee); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Rohit, [auto build test WARNING on tip/sched/core] [also build test WARNING on v4.14-rc1 next-20170921] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Rohit-Jain/sched-Introduce-new-flags-to-sched_setaffinity-to-support-soft-affinity/20170921-140313 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) vim +299 kernel/trace/trace_hwlat.c 0330f7aa Steven Rostedt (Red Hat 2016-07-15 269) f447c196 Steven Rostedt (VMware 2017-01-31 270) static void move_to_next_cpu(void) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 271) { f447c196 Steven Rostedt (VMware 2017-01-31 272) struct cpumask *current_mask = &save_cpumask; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 273) int next_cpu; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 274) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 275) if (disable_migrate) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 276) return; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 277) /* 0330f7aa Steven Rostedt (Red Hat 2016-07-15 278) * If for some reason the user modifies the CPU affinity 0330f7aa Steven Rostedt (Red Hat 2016-07-15 279) * of this thread, than stop migrating for the duration 0330f7aa Steven Rostedt (Red Hat 2016-07-15 280) * of the current test. 0330f7aa Steven Rostedt (Red Hat 2016-07-15 281) */ 0330f7aa Steven Rostedt (Red Hat 2016-07-15 282) if (!cpumask_equal(current_mask, ¤t->cpus_allowed)) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 283) goto disable; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 284) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 285) get_online_cpus(); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 286) cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 287) next_cpu = cpumask_next(smp_processor_id(), current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 288) put_online_cpus(); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 289) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 290) if (next_cpu >= nr_cpu_ids) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 291) next_cpu = cpumask_first(current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 292) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 293) if (next_cpu >= nr_cpu_ids) /* Shouldn't happen! */ 0330f7aa Steven Rostedt (Red Hat 2016-07-15 294) goto disable; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 295) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 296) cpumask_clear(current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 297) cpumask_set_cpu(next_cpu, current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 298) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 @299) sched_setaffinity(0, current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 300) return; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 301) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 302) disable: 0330f7aa Steven Rostedt (Red Hat 2016-07-15 303) disable_migrate = true; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 304) } 0330f7aa Steven Rostedt (Red Hat 2016-07-15 305) :::::: The code at line 299 was first introduced by commit :::::: 0330f7aa8ee63d0c435c0cb4e47ea06235ee4b7f tracing: Have hwlat trace migrate across tracing_cpumask CPUs :::::: TO: Steven Rostedt (Red Hat) :::::: CC: Steven Rostedt --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation