svcrdma: Clean up RPCRDMA_DEF_GFP

xprt_rdma_bc_allocate() is now the only user of RPCRDMA_DEF_GFP.
Replace that macro with the raw flags.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/svc_rdma_backchannel.c

@@ -119,12 +119,12 @@ xprt_rdma_bc_allocate(struct rpc_task *task)
 		return -EINVAL;
 	}
 
-	page = alloc_page(RPCRDMA_DEF_GFP);
+	page = alloc_page(GFP_NOIO | __GFP_NOWARN);
 	if (!page)
 		return -ENOMEM;
 	rqst->rq_buffer = page_address(page);
 
-	rqst->rq_rbuffer = kmalloc(rqst->rq_rcvsize, RPCRDMA_DEF_GFP);
+	rqst->rq_rbuffer = kmalloc(rqst->rq_rcvsize, GFP_NOIO | __GFP_NOWARN);
 	if (!rqst->rq_rbuffer) {
 		put_page(page);
 		return -ENOMEM;

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -149,8 +149,6 @@ static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
 	return rb->rg_data;
 }
 
-#define RPCRDMA_DEF_GFP		(GFP_NOIO | __GFP_NOWARN)
-
 /* To ensure a transport can always make forward progress,
  * the number of RDMA segments allowed in header chunk lists
  * is capped at 16. This prevents less-capable devices from