Hi Martin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Martin-KaFai-Lau/BTF-BPF-Type-Format/20180331-144656
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

quoted

kernel/bpf/inode.c:195:6: sparse: symbol 'map_seq_next' was not declared. Should it be static?
kernel/bpf/inode.c:282:30: sparse: symbol 'bpffs_map_fops' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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