diff options
| author | Pranith Kumar <bobby.prani@gmail.com> | 2014-07-08 17:46:50 -0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-07 16:18:07 -0700 |
| commit | 4de376a1b14e32f550931274f06b571abc0f3d4b (patch) | |
| tree | 2641f4598c5580d05652593f8c6bd4f601b94f4a /kernel/rcu/tree_plugin.h | |
| parent | 11ed7f934cb807f26da09547b5946c2e534d1dac (diff) | |
rcu: Remove remaining read-modify-write ACCESS_ONCE() calls
Change the remaining uses of ACCESS_ONCE() so that each ACCESS_ONCE() either does a load or a store, but not both.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index a7997e27256..218fae30c38 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -897,7 +897,8 @@ void synchronize_rcu_expedited(void) /* Clean up and exit. */ smp_mb(); /* ensure expedited GP seen before counter increment. */ - ACCESS_ONCE(sync_rcu_preempt_exp_count)++; + ACCESS_ONCE(sync_rcu_preempt_exp_count) = + sync_rcu_preempt_exp_count + 1; unlock_mb_ret: mutex_unlock(&sync_rcu_preempt_exp_mutex); mb_ret: @@ -2428,8 +2429,9 @@ static int rcu_nocb_kthread(void *arg) list = next; } trace_rcu_batch_end(rdp->rsp->name, c, !!list, 0, 0, 1); - ACCESS_ONCE(rdp->nocb_p_count) -= c; - ACCESS_ONCE(rdp->nocb_p_count_lazy) -= cl; + ACCESS_ONCE(rdp->nocb_p_count) = rdp->nocb_p_count - c; + ACCESS_ONCE(rdp->nocb_p_count_lazy) = + rdp->nocb_p_count_lazy - cl; rdp->n_nocbs_invoked += c; } return 0; |