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