bpf_maxbufsize
atomic_load_int(&bpf_maxbufsize));
&bpf_maxbufsize, BPF_MINBUFSIZE, MALLOC_MAX);
atomic_load_int(&bpf_maxbufsize);
int bpf_maxbufsize = BPF_MAXBUFSIZE; /* [a] */
if (p->k >= bpf_maxbufsize)
extern int bpf_maxbufsize;
.bd_buflen = bpf_maxbufsize(),
static int bpf_maxbufsize(void);