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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-07-27 13:41:47 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:42:49 -0700
commit1e3fd2b38cea41f5386bf23440f2cbdd74cf13d0 (patch)
tree0323ed32ad7616b328d49d1f0a934278988ca5a4 /kernel/rcutree_plugin.h
parent818615c4cde2a71a5857007b134cce89d506cc3f (diff)
downloadlinux-1e3fd2b38cea41f5386bf23440f2cbdd74cf13d0.tar.bz2
rcu: Properly initialize ->boost_tasks on CPU offline
When rcu_preempt_offline_tasks() clears tasks from a leaf rcu_node structure, it does not NULL out the structure's ->boost_tasks field. This commit therefore fixes this issue. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 7f3244c0df01..b1b485111321 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -584,8 +584,11 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
raw_spin_unlock(&rnp_root->lock); /* irqs still disabled */
}
+ rnp->gp_tasks = NULL;
+ rnp->exp_tasks = NULL;
#ifdef CONFIG_RCU_BOOST
- /* In case root is being boosted and leaf is not. */
+ rnp->boost_tasks = NULL;
+ /* In case root is being boosted and leaf was not. */
raw_spin_lock(&rnp_root->lock); /* irqs already disabled */
if (rnp_root->boost_tasks != NULL &&
rnp_root->boost_tasks != rnp_root->gp_tasks)
@@ -593,8 +596,6 @@ static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
raw_spin_unlock(&rnp_root->lock); /* irqs still disabled */
#endif /* #ifdef CONFIG_RCU_BOOST */
- rnp->gp_tasks = NULL;
- rnp->exp_tasks = NULL;
return retval;
}