2016-06-15 02:56, Xing, Beilei:

Can I ignore the two warnings?

1) Wrong headline format:
        ixgbe/base: fix firmware commands on X550em_a
        ixgbe/base: add KR support for X550em_a devices
Seems it's caused by '_' in name ' X550em_a '.

You can ignore these warnings.

2) Line too long:
        Fixes: 36f43e8679ae ("ixgbe/base: refactor manageability block communication")
        Fixes: 86b8fb293fdf ("ixgbe/base: add sw-firmware sync for resource sharing on X550em_a")
Fixline shouldn't be separated into two lines, right?

Yes fixline must be kept on one line.
You can ignore these warnings too.