On Wed, Jan 07, 2015 at 09:32:20AM -0800, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
>
> This commit prevents random compiler optimizations by applying
> ACCESS_ONCE() to lockless accesses.
>
> Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
> ---
> kernel/rcu/tree_plugin.h | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> 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. */
Didn't we just obsolete ACCESS_ONCE with that {READ,WRITE}_ONCE stuff?
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