On Mon, Jul 07, 2014 at 03:38:09PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
>
> In kernels built with CONFIG_NO_HZ_FULL, tick_do_timer_cpu is constant
> once boot completes. Thus, there is no need to wrap it in ACCESS_ONCE()
> in code that is built only when CONFIG_NO_HZ_FULL. This commit therefore
> removes the redundant ACCESS_ONCE().
>
> Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
ACK, thanks!
> ---
> kernel/rcu/tree_plugin.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> index 02ac0fb186b8..5da9f9b3abc9 100644
> --- a/kernel/rcu/tree_plugin.h
> +++ b/kernel/rcu/tree_plugin.h
> @@ -2844,7 +2844,7 @@ static bool rcu_nohz_full_cpu(struct rcu_state *rsp)
> static void rcu_bind_gp_kthread(void)
> {
> #ifdef CONFIG_NO_HZ_FULL
> - int cpu = ACCESS_ONCE(tick_do_timer_cpu);
> + int cpu = tick_do_timer_cpu;
>
> if (cpu < 0 || cpu >= nr_cpu_ids)
> return;
> --
> 1.8.1.5
>
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