Commit 717f98f0 authored by Paul E. McKenney's avatar Paul E. McKenney

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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent fc0763f5
...@@ -373,13 +373,6 @@ void rcu_enter_nohz(void) ...@@ -373,13 +373,6 @@ void rcu_enter_nohz(void)
smp_mb__after_atomic_inc(); /* Force ordering with next sojourn. */ smp_mb__after_atomic_inc(); /* Force ordering with next sojourn. */
WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1); WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1);
local_irq_restore(flags); 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();
} }
/* /*
......
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