[PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

[Palmer Dabbelt <palmer@rivosinc.com>]

From: Palmer Dabbelt <palmer@rivosinc.com>

These variables are not used on 32-bit targets as there's a big ifdef
around their use.  This results on a handful of warnings for 32-bit
RISC-V allyesconfig:

  CC      drivers/infiniband/sw/rxe/rxe_resp.o
linux/drivers/infiniband/sw/rxe/rxe_resp.c: In function 'atomic_write_reply':
linux/drivers/infiniband/sw/rxe/rxe_resp.c:794:13: error: unused variable 'payload' [-Werror=unused-variable]
  794 |         int payload = payload_size(pkt);
      |             ^~~~~~~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:793:24: error: unused variable 'mr' [-Werror=unused-variable]
  793 |         struct rxe_mr *mr = qp->resp.mr;
      |                        ^~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:19: error: unused variable 'dst' [-Werror=unused-variable]
  791 |         u64 src, *dst;
      |                   ^~~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:13: error: unused variable 'src' [-Werror=unused-variable]
  791 |         u64 src, *dst;
      |             ^~~
cc1: all warnings being treated as errors

Fixes: 034e285f8b99 ("RDMA/rxe: Make responder support atomic write on RC service")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---
 drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index 7a60c7709da0..18977d5a3316 100644
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -788,10 +788,10 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
 static enum resp_states atomic_write_reply(struct rxe_qp *qp,
 						struct rxe_pkt_info *pkt)
 {
-	u64 src, *dst;
-	struct resp_res *res = qp->resp.res;
-	struct rxe_mr *mr = qp->resp.mr;
-	int payload = payload_size(pkt);
+	__maybe_unused u64 src, *dst;
+	__maybe_unused struct resp_res *res = qp->resp.res;
+	__maybe_unused struct rxe_mr *mr = qp->resp.mr;
+	__maybe_unused int payload = payload_size(pkt);
 
 	if (!res) {
 		res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_WRITE_MASK);
-- 
2.38.1