net/mlx5: work around gcc error

RHEL 7.1's GCC for POWER8 reports the following error in one rte_memcpy()
macro call by mlx5:

 error: array subscript is above array bounds [-Werror=array-bounds]

It appears to be a GCC bug which can be worked around by making parentheses
more explicit.

Signed-off-by: Olga Shern <olgas@mellanox.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 615de94..fce3381 100644 (file)
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -472,8 +472,8 @@ mlx5_wqe_write_inline_vlan(struct txq *txq, volatile union mlx5_wqe *wqe,
                   (uint8_t *)addr, 12);
        rte_memcpy((uint8_t *)(uintptr_t)wqe->inl.eseg.inline_hdr_start + 12,
                   &vlan, sizeof(vlan));
-       rte_memcpy((uint8_t *)(uintptr_t)wqe->inl.eseg.inline_hdr_start + 16,
-                  ((uint8_t *)addr + 12), 2);
+       rte_memcpy((uint8_t *)((uintptr_t)wqe->inl.eseg.inline_hdr_start + 16),
+                  (uint8_t *)(addr + 12), 2);
        addr += MLX5_ETH_VLAN_INLINE_HEADER_SIZE - sizeof(vlan);
        length -= MLX5_ETH_VLAN_INLINE_HEADER_SIZE - sizeof(vlan);
        size = (sizeof(wqe->inl.ctrl.ctrl) +