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rcu: Fix thinko, actually initialize full tree

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Commit de078d8 ("rcu: Need to update rnp->gpnum if preemptable RCU
is to be reliable") repeatedly and incorrectly initializes the root
rcu_node structure's ->gpnum field rather than initializing the
->gpnum field of each node in the tree.  Fix this.  Also add an
additional consistency check to catch this in the future.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
LKML-Reference: <125329262011-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2009-09-18 09:50:19 -07:00 • committed by Ingo Molnar
parent e7d8842ed3
commit 49e291266d
2 changed files with 7 additions and 8 deletions
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4
kernel/rcutree_plugin.h
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@ -476,10 +476,12 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
/*
* Because there is no preemptable RCU, there can be no readers blocked,
* so there is no need to check for blocked tasks.
* so there is no need to check for blocked tasks. So check only for
* bogus qsmask values.
*/
static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp)
{
WARN_ON_ONCE(rnp->qsmask);
}
/*