kernel/bpf/stackmap.c

217 	struct stack_map_bucket *bucket, *new_bucket, *old_bucket;
242 		new_bucket = (struct stack_map_bucket *)
244 		if (unlikely(!new_bucket))
246 		new_bucket->nr = trace_nr;
248 			(struct bpf_stack_build_id *)new_bucket->data,
252 		    memcmp(bucket->data, new_bucket->data, trace_len) == 0) {
253 			pcpu_freelist_push(&smap->freelist, &new_bucket->fnode);
257 			pcpu_freelist_push(&smap->freelist, &new_bucket->fnode);
267 		new_bucket = (struct stack_map_bucket *)
269 		if (unlikely(!new_bucket))
271 		memcpy(new_bucket->data, ips, trace_len);
274 	new_bucket->hash = hash;
275 	new_bucket->nr = trace_nr;
277 	old_bucket = xchg(&smap->buckets[id], new_bucket);