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Commit 4305ce78 authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Make rcu_enter_nohz() pay attention to nesting 



The old version of rcu_enter_nohz() forced RCU into nohz mode even if
the nesting count was non-zero.  This change causes rcu_enter_nohz()
to hold off for non-zero nesting counts.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b5904090

kernel/rcutree.c

+2 −2
Original line number Diff line number Diff line
@@ -324,8 +324,8 @@ void rcu_enter_nohz(void) 
	smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */

	local_irq_save(flags);

	rdtp = &__get_cpu_var(rcu_dynticks);

	if (--rdtp->dynticks_nesting == 0)

		rdtp->dynticks++;

	rdtp->dynticks_nesting--;

	WARN_ON_ONCE(rdtp->dynticks & 0x1);

	local_irq_restore(flags);

}