From 3a5924052aec266f1035f2ff610b60b7d10dbe7f Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 4 Oct 2013 18:48:55 -0700 Subject: [PATCH] rcu: Allow task-level idle entry/exit nesting The current task-level idle entry/exit code forces an entry/exit on each call, regardless of the nesting level. This commit therefore properly accounts for nesting. Signed-off-by: Paul E. McKenney Reviewed-by: Frederic Weisbecker --- kernel/rcu/tree.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 264f0284c0bd..518e08428b2e 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -418,11 +418,12 @@ static void rcu_eqs_enter(bool user) rdtp = this_cpu_ptr(&rcu_dynticks); oldval = rdtp->dynticks_nesting; WARN_ON_ONCE((oldval & DYNTICK_TASK_NEST_MASK) == 0); - if ((oldval & DYNTICK_TASK_NEST_MASK) == DYNTICK_TASK_NEST_VALUE) + if ((oldval & DYNTICK_TASK_NEST_MASK) == DYNTICK_TASK_NEST_VALUE) { rdtp->dynticks_nesting = 0; - else + rcu_eqs_enter_common(rdtp, oldval, user); + } else { rdtp->dynticks_nesting -= DYNTICK_TASK_NEST_VALUE; - rcu_eqs_enter_common(rdtp, oldval, user); + } } /** @@ -540,11 +541,12 @@ static void rcu_eqs_exit(bool user) rdtp = this_cpu_ptr(&rcu_dynticks); oldval = rdtp->dynticks_nesting; WARN_ON_ONCE(oldval < 0); - if (oldval & DYNTICK_TASK_NEST_MASK) + if (oldval & DYNTICK_TASK_NEST_MASK) { rdtp->dynticks_nesting += DYNTICK_TASK_NEST_VALUE; - else + } else { rdtp->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE; - rcu_eqs_exit_common(rdtp, oldval, user); + rcu_eqs_exit_common(rdtp, oldval, user); + } } /**