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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-10-04 18:48:55 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-12-03 10:10:19 -0800 |
| commit | 3a5924052aec266f1035f2ff610b60b7d10dbe7f (patch) | |
| tree | f9f51bfef9ed03765bf0c6e711d018ce10d8c071 /kernel/rcu | |
| parent | 96d3fd0d315a949e30adc80f086031c5cdf070d1 (diff) | |
| download | blackbird-op-linux-3a5924052aec266f1035f2ff610b60b7d10dbe7f.tar.gz blackbird-op-linux-3a5924052aec266f1035f2ff610b60b7d10dbe7f.zip | |
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 <paulmck@linux.vnet.ibm.com>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 14 |
1 files 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); + } } /** |
