Subject: linux-next: manual merge of the rcu tree with the tip tree

From: Stephen Rothwell <[email-masked]>
Date: Wed, 23 Jun 2021 15:33:27 +1000

Hi all,

Today's linux-next merge of the rcu tree got a conflict in:

  kernel/rcu/tree_stall.h

between commit:

  2f064a59a11f ("sched: Change task_struct::state")

from the tip tree and commit:

  e44111ed20d8 ("rcu: Add ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output")

from the rcu tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc kernel/rcu/tree_stall.h
index acb2288063b5,be648ab03906..000000000000
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@@ -734,21 -817,30 +817,30 @@@ void show_rcu_gp_kthreads(void
  	j = jiffies;
  	ja = j - data_race(rcu_state.gp_activity);
  	jr = j - data_race(rcu_state.gp_req_activity);
+ 	js = j - data_race(rcu_state.gp_start);
  	jw = j - data_race(rcu_state.gp_wake_time);
- 	pr_info("%s: wait state: %s(%d) ->state: %#x delta ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n",
 -	pr_info("%s: wait state: %s(%d) ->state: %#lx ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_max %lu ->gp_flags %#x\n",
++	pr_info("%s: wait state: %s(%d) ->state: %#x ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_max %lu ->gp_flags %#x\n",
  		rcu_state.name, gp_state_getname(rcu_state.gp_state),
- 		rcu_state.gp_state, t ? t->__state : 0x1ffff,
- 		ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq),
 -		rcu_state.gp_state, t ? t->state : 0x1ffffL, t ? t->rt_priority : 0xffU,
++		rcu_state.gp_state, t ? t->__state : 0x1ffff, t ? t->rt_priority : 0xffU,
+ 		js, ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq),
  		(long)data_race(rcu_state.gp_seq),
  		(long)data_race(rcu_get_root()->gp_seq_needed),
+ 		data_race(rcu_state.gp_max),
  		data_race(rcu_state.gp_flags));
  	rcu_for_each_node_breadth_first(rnp) {
- 		if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq),
- 				 READ_ONCE(rnp->gp_seq_needed)))
+ 		if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq), READ_ONCE(rnp->gp_seq_needed)) &&
+ 		    !data_race(rnp->qsmask) && !data_race(rnp->boost_tasks) &&
+ 		    !data_race(rnp->exp_tasks) && !data_race(rnp->gp_tasks))
  			continue;
- 		pr_info("\trcu_node %d:%d ->gp_seq %ld ->gp_seq_needed %ld\n",
- 			rnp->grplo, rnp->grphi, (long)data_race(rnp->gp_seq),
- 			(long)data_race(rnp->gp_seq_needed));
+ 		pr_info("\trcu_node %d:%d ->gp_seq %ld ->gp_seq_needed %ld ->qsmask %#lx %c%c%c%c ->n_boosts %ld\n",
+ 			rnp->grplo, rnp->grphi,
+ 			(long)data_race(rnp->gp_seq), (long)data_race(rnp->gp_seq_needed),
+ 			data_race(rnp->qsmask),
+ 			".b"[!!data_race(rnp->boost_kthread_task)],
+ 			".B"[!!data_race(rnp->boost_tasks)],
+ 			".E"[!!data_race(rnp->exp_tasks)],
+ 			".G"[!!data_race(rnp->gp_tasks)],
+ 			data_race(rnp->n_boosts));
  		if (!rcu_is_leaf_node(rnp))
  			continue;
  		for_each_leaf_node_possible_cpu(rnp, cpu) {