Commit 768f5d50 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Simplify rcu_report_dead() call to rcu_report_exp_rdp() 



Currently, rcu_report_dead() disables preemption across its call to
rcu_report_exp_rdp(), but this is pointless because interrupts are
already disabled by the caller.  In addition, rcu_report_dead() computes
the address of the outgoing CPU's rcu_data structure, which is also
pointless because this address is already present in local variable rdp.
This commit therefore drops the preemption disabling and passes rdp
to rcu_report_exp_rdp().

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 2caebefb

kernel/rcu/tree.c

+1 −3
Original line number Diff line number Diff line
@@ -4294,9 +4294,7 @@ void rcu_report_dead(unsigned int cpu) 
	do_nocb_deferred_wakeup(rdp);



	/* QS for any half-done expedited grace period. */

	preempt_disable();

	rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));

	preempt_enable();

	rcu_report_exp_rdp(rdp);

	rcu_preempt_deferred_qs(current);



	/* Remove outgoing CPU from mask in the leaf rcu_node structure. */