mask_spec
mask_spec((u8 *)eth_mask, (u8 *)eth_val, sizeof(*eth_mask));
mask_spec(fs->m_ext.h_dest, fs->h_ext.h_dest, ETH_ALEN);
static int record__mmap_cpu_mask_init_spec(struct mmap_cpu_mask *mask, const char *mask_spec)
cpus = perf_cpu_map__new(mask_spec);