BITS_PER_BYTE_MASK  161 kernel/bpf/btf.c #define BITS_PER_BYTE_MASK (BITS_PER_BYTE - 1)
BITS_PER_BYTE_MASK   16 tools/bpf/bpftool/btf_dumper.c #define BITS_PER_BYTE_MASK (BITS_PER_BYTE - 1)