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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-10-29 15:39:39 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-06 11:02:39 -0800 |
| commit | b08ea27d95bcaee6d9cf4edd64f373006661424a (patch) | |
| tree | 0c2dd68df7898cc28804d0dc422961b0441e315f /kernel/rcu | |
| parent | 734d16801349fbe951d2f780191d32c5b8a892d1 (diff) | |
| download | linux-stable-b08ea27d95bcaee6d9cf4edd64f373006661424a.tar.gz linux-stable-b08ea27d95bcaee6d9cf4edd64f373006661424a.tar.bz2 linux-stable-b08ea27d95bcaee6d9cf4edd64f373006661424a.zip | |
rcu: Protect rcu_boost() lockless accesses with ACCESS_ONCE()
This commit prevents random compiler optimizations by applying
ACCESS_ONCE() to lockless accesses.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 3ec85cb5d544..d59913ef8360 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1127,7 +1127,8 @@ static int rcu_boost(struct rcu_node *rnp) struct task_struct *t; struct list_head *tb; - if (rnp->exp_tasks == NULL && rnp->boost_tasks == NULL) + if (ACCESS_ONCE(rnp->exp_tasks) == NULL && + ACCESS_ONCE(rnp->boost_tasks) == NULL) return 0; /* Nothing left to boost. */ raw_spin_lock_irqsave(&rnp->lock, flags); |