linux-kernel - Re: [PATCH v13 04/11] cpuset: Add new v2 cpuset.sched.partition flag

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Date:   Sat, 13 Oct 2018 22:10:07 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Waiman Long <longman@...hat.com>
Cc:     kbuild-all@...org, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kernel-team@...com, pjt@...gle.com, luto@...capital.net,
        Mike Galbraith <efault@....de>, torvalds@...ux-foundation.org,
        Roman Gushchin <guro@...com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v13 04/11] cpuset: Add new v2 cpuset.sched.partition flag

Hi Waiman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on cgroup/for-next]
[also build test ERROR on v4.19-rc7 next-20181012]
[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/Waiman-Long/cpuset-Enable-cpuset-controller-in-default-hierarchy/20181013-213352
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next
config: i386-randconfig-x078-201840 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/cgroup/cpuset.c: In function 'update_cpumask':
>> kernel/cgroup/cpuset.c:1293:15: error: assignment to expression with array type
     tmp.addmask  = trialcs->subparts_cpus;
                  ^
   kernel/cgroup/cpuset.c:1294:15: error: assignment to expression with array type
     tmp.delmask  = trialcs->effective_cpus;
                  ^
   kernel/cgroup/cpuset.c:1295:15: error: assignment to expression with array type
     tmp.new_cpus = trialcs->cpus_allowed;
                  ^

vim +1293 kernel/cgroup/cpuset.c

  1247	
  1248	/**
  1249	 * update_cpumask - update the cpus_allowed mask of a cpuset and all tasks in it
  1250	 * @cs: the cpuset to consider
  1251	 * @trialcs: trial cpuset
  1252	 * @buf: buffer of cpu numbers written to this cpuset
  1253	 */
  1254	static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
  1255				  const char *buf)
  1256	{
  1257		int retval;
  1258		struct tmpmasks tmp;
  1259	
  1260		/* top_cpuset.cpus_allowed tracks cpu_online_mask; it's read-only */
  1261		if (cs == &top_cpuset)
  1262			return -EACCES;
  1263	
  1264		/*
  1265		 * An empty cpus_allowed is ok only if the cpuset has no tasks.
  1266		 * Since cpulist_parse() fails on an empty mask, we special case
  1267		 * that parsing.  The validate_change() call ensures that cpusets
  1268		 * with tasks have cpus.
  1269		 */
  1270		if (!*buf) {
  1271			cpumask_clear(trialcs->cpus_allowed);
  1272		} else {
  1273			retval = cpulist_parse(buf, trialcs->cpus_allowed);
  1274			if (retval < 0)
  1275				return retval;
  1276	
  1277			if (!cpumask_subset(trialcs->cpus_allowed,
  1278					    top_cpuset.cpus_allowed))
  1279				return -EINVAL;
  1280		}
  1281	
  1282		/* Nothing to do if the cpus didn't change */
  1283		if (cpumask_equal(cs->cpus_allowed, trialcs->cpus_allowed))
  1284			return 0;
  1285	
  1286		retval = validate_change(cs, trialcs);
  1287		if (retval < 0)
  1288			return retval;
  1289	
  1290		/*
  1291		 * Use the cpumasks in trialcs for tmpmasks.
  1292		 */
> 1293		tmp.addmask  = trialcs->subparts_cpus;
  1294		tmp.delmask  = trialcs->effective_cpus;
  1295		tmp.new_cpus = trialcs->cpus_allowed;
  1296	
  1297		if (cs->partition_root_state) {
  1298			/* Cpumask of a partition root cannot be empty */
  1299			if (cpumask_empty(trialcs->cpus_allowed))
  1300				return -EINVAL;
  1301			if (update_parent_subparts_cpumask(cs, partcmd_update,
  1302						trialcs->cpus_allowed, &tmp) < 0)
  1303				return -EINVAL;
  1304		}
  1305	
  1306		spin_lock_irq(&callback_lock);
  1307		cpumask_copy(cs->cpus_allowed, trialcs->cpus_allowed);
  1308	
  1309		/*
  1310		 * Make sure that subparts_cpus is a subset of cpus_allowed.
  1311		 */
  1312		if (cs->nr_subparts_cpus) {
  1313			cpumask_andnot(cs->subparts_cpus, cs->subparts_cpus,
  1314				       cs->cpus_allowed);
  1315			cs->nr_subparts_cpus = cpumask_weight(cs->subparts_cpus);
  1316		}
  1317		spin_unlock_irq(&callback_lock);
  1318	
  1319		update_cpumasks_hier(cs, &tmp);
  1320		return 0;
  1321	}
  1322	

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