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Commit 289828e6 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Silence unused-variable warnings 



The "idle" variable in both rcu_eqs_enter_common() and
rcu_eqs_exit_common() is only used in a WARN_ON_ONCE().  If the kernel
is built disabling WARN_ON_ONCE(), the compiler will complain (rightly)
that "idle" is unused.  This commit therefore adds a __maybe_unused to
the declaration of both variables.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent c9d4b0af

kernel/rcutree.c

+4 −2
Original line number Diff line number Diff line
@@ -371,7 +371,8 @@ static void rcu_eqs_enter_common(struct rcu_dynticks *rdtp, long long oldval, 
{

	trace_rcu_dyntick(TPS("Start"), oldval, rdtp->dynticks_nesting);

	if (!user && !is_idle_task(current)) {

		struct task_struct *idle = idle_task(smp_processor_id());

		struct task_struct *idle __maybe_unused =

			idle_task(smp_processor_id());



		trace_rcu_dyntick(TPS("Error on entry: not idle task"), oldval, 0);

		ftrace_dump(DUMP_ORIG);
@@ -508,7 +509,8 @@ static void rcu_eqs_exit_common(struct rcu_dynticks *rdtp, long long oldval, 
	rcu_cleanup_after_idle(smp_processor_id());

	trace_rcu_dyntick(TPS("End"), oldval, rdtp->dynticks_nesting);

	if (!user && !is_idle_task(current)) {

		struct task_struct *idle = idle_task(smp_processor_id());

		struct task_struct *idle __maybe_unused =

			idle_task(smp_processor_id());



		trace_rcu_dyntick(TPS("Error on exit: not idle task"),

				  oldval, rdtp->dynticks_nesting);