[ammarfaizi2-block:paulmck/linux-rcu/dev.2022.05.18a 64/65] kernel/rcu/tasks.h:1514 rcu_tasks_trace_pregp_step() error: uninitialized symbol 'rtpcp'.

[ammarfaizi2-block:paulmck/linux-rcu/dev.2022.05.18a 64/65] kernel/rcu/tasks.h:1514 rcu_tasks_trace_pregp_step() error: uninitialized symbol 'rtpcp'.

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: "GNU/Weeb Mailing List" <gwml@vger.gnuweeb.org>
CC: linux-kernel(a)vger.kernel.org
TO: "Paul E. McKenney" <paulmck@kernel.org>

tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev.2022.05.18a
head:   9735325cf6f7eb6cdcf1ad875b49faa72f288f79
commit: ec0c0f7ea3f62df2f6494b490fe158bcac66a1f1 [64/65] fixup! rcu-tasks: Scan per-CPU lists of RCU Tasks Trace blocked tasks
:::::: branch date: 21 hours ago
:::::: commit date: 4 days ago
config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220524/202205242352.SlyLYuAI-lkp(a)intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
kernel/rcu/tasks.h:1514 rcu_tasks_trace_pregp_step() error: uninitialized symbol 'rtpcp'.

vim +/rtpcp +1514 kernel/rcu/tasks.h

b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1469  
d5f177d35c2442 Paul E. McKenney 2020-03-09  1470  /* Initialize for a new RCU-tasks-trace grace period. */
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1471  static void rcu_tasks_trace_pregp_step(struct list_head *hop)
d5f177d35c2442 Paul E. McKenney 2020-03-09  1472  {
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1473  	LIST_HEAD(blkd_tasks);
d5f177d35c2442 Paul E. McKenney 2020-03-09  1474  	int cpu;
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1475  	unsigned long flags;
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1476  	struct rcu_tasks_percpu *rtpcp;
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1477  	struct task_struct *t;
d5f177d35c2442 Paul E. McKenney 2020-03-09  1478  
d5f177d35c2442 Paul E. McKenney 2020-03-09  1479  	// Allow for fast-acting IPIs.
d5f177d35c2442 Paul E. McKenney 2020-03-09  1480  	atomic_set(&trc_n_readers_need_end, 1);
d5f177d35c2442 Paul E. McKenney 2020-03-09  1481  
d5f177d35c2442 Paul E. McKenney 2020-03-09  1482  	// There shouldn't be any old IPIs, but...
d5f177d35c2442 Paul E. McKenney 2020-03-09  1483  	for_each_possible_cpu(cpu)
d5f177d35c2442 Paul E. McKenney 2020-03-09  1484  		WARN_ON_ONCE(per_cpu(trc_ipi_to_cpu, cpu));
81b4a7bc3b54b0 Paul E. McKenney 2020-03-22  1485  
81b4a7bc3b54b0 Paul E. McKenney 2020-03-22  1486  	// Disable CPU hotplug across the tasklist scan.
81b4a7bc3b54b0 Paul E. McKenney 2020-03-22  1487  	// This also waits for all readers in CPU-hotplug code paths.
81b4a7bc3b54b0 Paul E. McKenney 2020-03-22  1488  	cpus_read_lock();
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1489  
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1490  	// These smp_call_function_single() calls are serialized to
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1491  	// allow safe access to the hop list.
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1492  	for_each_possible_cpu(cpu)
b2a7e376a9dcfa Paul E. McKenney 2022-05-18  1493  		smp_call_function_single(cpu, rcu_tasks_trace_pertask_handler, hop, 1);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1494  
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1495  	// Only after all running tasks have been accounted for is it
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1496  	// safe to take care of the tasks that have blocked within their
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1497  	// current RCU tasks trace read-side critical section.
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1498  	for_each_possible_cpu(cpu) {
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1499  		rtpcp = per_cpu_ptr(rcu_tasks_trace.rtpcpu, cpu);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1500  		raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1501  		list_splice_init(&rtpcp->rtp_blkd_tasks, &blkd_tasks);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1502  		while (!list_empty(&blkd_tasks)) {
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1503  			t = list_first_entry(&blkd_tasks, struct task_struct, trc_blkd_node);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1504  			list_del_init(&t->trc_blkd_node);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1505  			list_add(&t->trc_blkd_node, &rtpcp->rtp_blkd_tasks);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1506  			raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1507  			rcu_tasks_trace_pertask(t, hop);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1508  			raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1509  		}
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1510  		raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1511  	}
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1512  	// Pull in the tasks that blocked on this CPU while in their
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1513  	// current RCU tasks trace read-side critical section.
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20 @1514  	raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1515  	list_for_each_entry(t, &rtpcp->rtp_blkd_tasks, trc_blkd_node)
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1516  		if (rcu_tasks_trace_pertask_prep(t))
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1517  			trc_add_holdout(t, hop);
ec0c0f7ea3f62d Paul E. McKenney 2022-05-20  1518  	raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
d5f177d35c2442 Paul E. McKenney 2020-03-09  1519  }
d5f177d35c2442 Paul E. McKenney 2020-03-09  1520  

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