oldswitch 438 net/sunrpc/xprtmultipath.c struct rpc_xprt_switch __rcu *oldswitch; oldswitch 441 net/sunrpc/xprtmultipath.c oldswitch = xchg(&xpi->xpi_xpswitch, RCU_INITIALIZER(newswitch)); oldswitch 444 net/sunrpc/xprtmultipath.c return rcu_dereference_protected(oldswitch, true);