rcutorture: Replace barriers with smp_store_release() and smp_load_acquire()
The rcutorture.c file uses several explicit memory barriers that can easily be converted to smp_store_release() and smp_load_acquire(), which improves maintainability and also improves performance a bit. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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