From: Paul E. McKenney Date: Sun, 1 Sep 2013 02:23:29 +0000 (-0700) Subject: rcu: Silence unused-variable warnings X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=289828e62de0334a0d01c0f65df91cd47d3a9e05;p=linux-beck.git 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: Paul E. McKenney --- diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 8eb9cfd9e2b1..e6f2e8f14140 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -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);