bpf: Remove __bpf_local_storage_map_alloc

bpf_local_storage_map_alloc() is the only caller of
__bpf_local_storage_map_alloc().  The remaining logic in
bpf_local_storage_map_alloc() is only a one liner setting
the smap->cache_idx.

Remove __bpf_local_storage_map_alloc() to simplify code.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20230308065936.1550103-4-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

kernel/bpf/bpf_local_storage.c

@@ -601,40 +601,6 @@ int bpf_local_storage_map_alloc_check(union bpf_attr *attr)
 	return 0;
 }
 
-static struct bpf_local_storage_map *__bpf_local_storage_map_alloc(union bpf_attr *attr)
-{
-	struct bpf_local_storage_map *smap;
-	unsigned int i;
-	u32 nbuckets;
-
-	smap = bpf_map_area_alloc(sizeof(*smap), NUMA_NO_NODE);
-	if (!smap)
-		return ERR_PTR(-ENOMEM);
-	bpf_map_init_from_attr(&smap->map, attr);
-
-	nbuckets = roundup_pow_of_two(num_possible_cpus());
-	/* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
-	nbuckets = max_t(u32, 2, nbuckets);
-	smap->bucket_log = ilog2(nbuckets);
-
-	smap->buckets = bpf_map_kvcalloc(&smap->map, sizeof(*smap->buckets),
-					 nbuckets, GFP_USER | __GFP_NOWARN);
-	if (!smap->buckets) {
-		bpf_map_area_free(smap);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	for (i = 0; i < nbuckets; i++) {
-		INIT_HLIST_HEAD(&smap->buckets[i].list);
-		raw_spin_lock_init(&smap->buckets[i].lock);
-	}
-
-	smap->elem_size = offsetof(struct bpf_local_storage_elem,
-				   sdata.data[attr->value_size]);
-
-	return smap;
-}
-
 int bpf_local_storage_map_check_btf(const struct bpf_map *map,
 				    const struct btf *btf,
 				    const struct btf_type *key_type,
@@ -704,10 +670,33 @@ bpf_local_storage_map_alloc(union bpf_attr *attr,
 			    struct bpf_local_storage_cache *cache)
 {
 	struct bpf_local_storage_map *smap;
+	unsigned int i;
+	u32 nbuckets;
 
-	smap = __bpf_local_storage_map_alloc(attr);
-	if (IS_ERR(smap))
-		return ERR_CAST(smap);
+	smap = bpf_map_area_alloc(sizeof(*smap), NUMA_NO_NODE);
+	if (!smap)
+		return ERR_PTR(-ENOMEM);
+	bpf_map_init_from_attr(&smap->map, attr);
+
+	nbuckets = roundup_pow_of_two(num_possible_cpus());
+	/* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
+	nbuckets = max_t(u32, 2, nbuckets);
+	smap->bucket_log = ilog2(nbuckets);
+
+	smap->buckets = bpf_map_kvcalloc(&smap->map, sizeof(*smap->buckets),
+					 nbuckets, GFP_USER | __GFP_NOWARN);
+	if (!smap->buckets) {
+		bpf_map_area_free(smap);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	for (i = 0; i < nbuckets; i++) {
+		INIT_HLIST_HEAD(&smap->buckets[i].list);
+		raw_spin_lock_init(&smap->buckets[i].lock);
+	}
+
+	smap->elem_size = offsetof(struct bpf_local_storage_elem,
+				   sdata.data[attr->value_size]);
 
 	smap->cache_idx = bpf_local_storage_cache_idx_get(cache);
 	return &smap->map;