[next] [s390 ] net: mlx5: tc_tun.h:24:29: error: field 'match_level' has incomplete type

While building Linux next tag 20210209 s390 (defconfig) with gcc-9
make modules failed.
  - s390 (defconfig) with gcc-8 - FAILED
  - s390 (defconfig) with gcc-9 - FAILED
  - s390 (defconfig) with gcc-10 - FAILED

make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=s390
CROSS_COMPILE=s390x-linux-gnu- 'CC=sccache s390x-linux-gnu-gcc'
'HOSTCC=sccache gcc'
In file included from drivers/net/ethernet/mellanox/mlx5/core/en_tc.h:40,
                 from drivers/net/ethernet/mellanox/mlx5/core/en_main.c:45:
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h:24:29: error:
field 'match_level' has incomplete type
   24 |  enum mlx5_flow_match_level match_level;
      |                             ^~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h:27:26: warning:
'struct mlx5e_encap_entry' declared inside parameter list will not be
visible outside of this definition or declaration
   27 |  int (*calc_hlen)(struct mlx5e_encap_entry *e);
      |                          ^~~~~~~~~~~~~~~~~

Reported-by: Naresh Kamboju <redacted>

build link,
https://builds.tuxbuild.com/1oF9mT3pKaPfVIptyzGbiNjKW0m/

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https://lkft.linaro.org