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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-09-18 09:50:19 -0700
committerIngo Molnar <mingo@elte.hu>2009-09-19 08:53:21 +0200
commit49e291266d0920264471d9d64268fb030e33a99a (patch)
tree8770717427ee877e6b7b3dae6b120f35be645d70 /kernel/rcutree_plugin.h
parente7d8842ed34a7fe19d1ed90f84c211fb056ac523 (diff)
downloadlinux-49e291266d0920264471d9d64268fb030e33a99a.tar.bz2
rcu: Fix thinko, actually initialize full tree
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>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index cd6047cc7fc2..09b7325baad1 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -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);
}
/*