rcutorture: Fix a sparse warning by marking boost_mutex static

This commit fixes the following sparse warning by marking boost_mutex
static:

kernel/rcu/rcutorture.c:185:1: warning: symbol 'boost_mutex' was not declared. Should it be static?

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 948a7693748e..7e67711cbae8 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -182,7 +182,7 @@ static u64 notrace rcu_trace_clock_local(void)
 #endif /* #else #ifdef CONFIG_RCU_TRACE */
 
 static unsigned long boost_starttime;   /* jiffies of next boost test start. */
-DEFINE_MUTEX(boost_mutex);              /* protect setting boost_starttime */
+static DEFINE_MUTEX(boost_mutex);       /* protect setting boost_starttime */
                                         /*  and boost task create/destroy. */
 static atomic_t barrier_cbs_count;      /* Barrier callbacks registered. */
 static bool barrier_phase;              /* Test phase. */