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Date:   Sat, 2 Sep 2017 06:16:58 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/next 27/27] kernel//rcu/rcutorture.c:1124:3: note: in
 expansion of macro 'rcu_ftrace_dump'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   909bd6e3d9e73fd0ca1d6255466573d4c3fbe321
commit: 909bd6e3d9e73fd0ca1d6255466573d4c3fbe321 [27/27] rcu: Suppress RCU CPU stall warnings while dumping trace
config: x86_64-randconfig-x016-201735 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 909bd6e3d9e73fd0ca1d6255466573d4c3fbe321
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from kernel//rcu/rcutorture.c:56:0:
   kernel//rcu/rcutorture.c: In function 'rcu_torture_timer':
   kernel//rcu/rcu.h:225:8: error: 'rcu_cpu_stall_suppress' undeclared (first use in this function)
      if (!rcu_cpu_stall_suppress) \
           ^
>> kernel//rcu/rcutorture.c:1124:3: note: in expansion of macro 'rcu_ftrace_dump'
      rcu_ftrace_dump(DUMP_ALL);
      ^~~~~~~~~~~~~~~
   kernel//rcu/rcu.h:225:8: note: each undeclared identifier is reported only once for each function it appears in
      if (!rcu_cpu_stall_suppress) \
           ^
>> kernel//rcu/rcutorture.c:1124:3: note: in expansion of macro 'rcu_ftrace_dump'
      rcu_ftrace_dump(DUMP_ALL);
      ^~~~~~~~~~~~~~~
   kernel//rcu/rcutorture.c: In function 'rcu_torture_reader':
   kernel//rcu/rcu.h:225:8: error: 'rcu_cpu_stall_suppress' undeclared (first use in this function)
      if (!rcu_cpu_stall_suppress) \
           ^
   kernel//rcu/rcutorture.c:1205:4: note: in expansion of macro 'rcu_ftrace_dump'
       rcu_ftrace_dump(DUMP_ALL);
       ^~~~~~~~~~~~~~~
   kernel//rcu/rcutorture.c: In function 'rcu_torture_stats_print':
   kernel//rcu/rcu.h:225:8: error: 'rcu_cpu_stall_suppress' undeclared (first use in this function)
      if (!rcu_cpu_stall_suppress) \
           ^
   kernel//rcu/rcutorture.c:1335:3: note: in expansion of macro 'rcu_ftrace_dump'
      rcu_ftrace_dump(DUMP_ALL);
      ^~~~~~~~~~~~~~~

vim +/rcu_ftrace_dump +1124 kernel//rcu/rcutorture.c

f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1074  
b772e1dd4 kernel/rcutorture.c     Josh Triplett    2006-10-04  1075  /*
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1076   * RCU torture reader from timer handler.  Dereferences rcu_torture_current,
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1077   * incrementing the corresponding element of the pipeline array.  The
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1078   * counter in the element should never be greater than 1, otherwise, the
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1079   * RCU implementation is broken.
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1080   */
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1081  static void rcu_torture_timer(unsigned long unused)
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1082  {
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1083  	int idx;
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1084  	unsigned long started;
6b80da42c kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1085  	unsigned long completed;
51b1130eb kernel/rcu/rcutorture.c Paul E. McKenney 2014-01-27  1086  	static DEFINE_TORTURE_RANDOM(rand);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1087  	static DEFINE_SPINLOCK(rand_lock);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1088  	struct rcu_torture *p;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1089  	int pipe_count;
524945351 kernel/rcutorture.c     Paul E. McKenney 2012-11-14  1090  	unsigned long long ts;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1091  
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1092  	idx = cur_ops->readlock();
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1093  	if (cur_ops->started)
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1094  		started = cur_ops->started();
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1095  	else
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1096  		started = cur_ops->completed();
e4aa0da39 kernel/rcutorture.c     Steven Rostedt   2013-02-04  1097  	ts = rcu_trace_clock_local();
632ee2001 kernel/rcutorture.c     Paul E. McKenney 2010-02-22  1098  	p = rcu_dereference_check(rcu_torture_current,
632ee2001 kernel/rcutorture.c     Paul E. McKenney 2010-02-22  1099  				  rcu_read_lock_bh_held() ||
632ee2001 kernel/rcutorture.c     Paul E. McKenney 2010-02-22  1100  				  rcu_read_lock_sched_held() ||
5be5d1a11 kernel/rcu/rcutorture.c Paul E. McKenney 2015-06-30  1101  				  srcu_read_lock_held(srcu_ctlp) ||
5be5d1a11 kernel/rcu/rcutorture.c Paul E. McKenney 2015-06-30  1102  				  torturing_tasks());
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1103  	if (p == NULL) {
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1104  		/* Leave because rcu_torture_writer is not yet underway */
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1105  		cur_ops->readunlock(idx);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1106  		return;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1107  	}
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1108  	if (p->rtort_mbtest == 0)
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1109  		atomic_inc(&n_rcu_torture_mberror);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1110  	spin_lock(&rand_lock);
0acc512cb kernel/rcutorture.c     Paul E. McKenney 2009-06-25  1111  	cur_ops->read_delay(&rand);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1112  	n_rcu_torture_timers++;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1113  	spin_unlock(&rand_lock);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1114  	preempt_disable();
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1115  	pipe_count = p->rtort_pipe_count;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1116  	if (pipe_count > RCU_TORTURE_PIPE_LEN) {
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1117  		/* Should not happen, but... */
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1118  		pipe_count = RCU_TORTURE_PIPE_LEN;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1119  	}
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1120  	completed = cur_ops->completed();
524945351 kernel/rcutorture.c     Paul E. McKenney 2012-11-14  1121  	if (pipe_count > 1) {
524945351 kernel/rcutorture.c     Paul E. McKenney 2012-11-14  1122  		do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts,
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1123  					  started, completed);
274529ba9 kernel/rcu/rcutorture.c Paul E. McKenney 2016-03-21 @1124  		rcu_ftrace_dump(DUMP_ALL);
524945351 kernel/rcutorture.c     Paul E. McKenney 2012-11-14  1125  	}
dd17c8f72 kernel/rcutorture.c     Rusty Russell    2009-10-29  1126  	__this_cpu_inc(rcu_torture_count[pipe_count]);
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1127  	completed = completed - started;
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1128  	if (cur_ops->started)
917963d0b kernel/rcu/rcutorture.c Paul E. McKenney 2014-11-21  1129  		completed++;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1130  	if (completed > RCU_TORTURE_PIPE_LEN) {
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1131  		/* Should not happen, but... */
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1132  		completed = RCU_TORTURE_PIPE_LEN;
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1133  	}
dd17c8f72 kernel/rcutorture.c     Rusty Russell    2009-10-29  1134  	__this_cpu_inc(rcu_torture_batch[completed]);
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1135  	preempt_enable();
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1136  	cur_ops->readunlock(idx);
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1137  
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1138  	/* Test call_rcu() invocation from interrupt handler. */
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1139  	if (cur_ops->call) {
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1140  		struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_NOWAIT);
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1141  
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1142  		if (rhp)
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1143  			cur_ops->call(rhp, rcu_torture_timer_cb);
f34c8585e kernel/rcu/rcutorture.c Paul E. McKenney 2017-07-20  1144  	}
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1145  }
0729fbf3b kernel/rcutorture.c     Paul E. McKenney 2008-06-25  1146  

:::::: The code at line 1124 was first introduced by commit
:::::: 274529ba9bda86c91c2c06da3a641aaf617dd30f rcu: Consolidate dumping of ftrace buffer

:::::: TO: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
:::::: CC: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

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