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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-08-05 22:39:02 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-09-28 21:38:31 -0700
commit717f98f0f87c16c1e5768ac8f67c27f3d3535a25 (patch)
tree4d2234eb29a350a3a5b1d7e4d29445c57b66f9f2 /kernel/rcutree.c
parentfc0763f53e3ff6a6bfa66934662a3446b9ca6f16 (diff)
rcu: Eliminate in_irq() checks in rcu_enter_nohz()
The in_irq() check in rcu_enter_nohz() is redundant because if we really are in an interrupt, the attempt to re-enter dyntick-idle mode will invoke rcu_needs_cpu() in any case, which will force the check for RCU callbacks. So this commit removes the check along with the set_need_resched(). Suggested-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 7e2f297aeec8..0c6c30dc6a7c 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -373,13 +373,6 @@ void rcu_enter_nohz(void)
smp_mb__after_atomic_inc(); /* Force ordering with next sojourn. */
WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1);
local_irq_restore(flags);
-
- /* If the interrupt queued a callback, get out of dyntick mode. */
- if (in_irq() &&
- (__get_cpu_var(rcu_sched_data).nxtlist ||
- __get_cpu_var(rcu_bh_data).nxtlist ||
- rcu_preempt_needs_cpu(smp_processor_id())))
- set_need_resched();
}
/*