bpf: Make __GFP_NOWARN consistent in bpf map creation

Some of the bpf maps are created with __GFP_NOWARN, i.e. arraymap,
bloom_filter, bpf_local_storage, bpf_struct_ops, lpm_trie,
queue_stack_maps, reuseport_array, stackmap and xskmap, while others are
created without __GFP_NOWARN, i.e. cpumap, devmap, hashtab,
local_storage, offload, ringbuf and sock_map. But there are not key
differences between the creation of these maps. So let make this
allocation flag consistent in all bpf maps creation. Then we can use a
generic helper to alloc all bpf maps.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20220810151840.16394-4-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

kernel/bpf/cpumap.c

@@ -97,7 +97,7 @@ static struct bpf_map *cpu_map_alloc(union bpf_attr *attr)
 	    attr->map_flags & ~BPF_F_NUMA_NODE)
 		return ERR_PTR(-EINVAL);
 
-	cmap = kzalloc(sizeof(*cmap), GFP_USER | __GFP_ACCOUNT);
+	cmap = kzalloc(sizeof(*cmap), GFP_USER | __GFP_NOWARN |  __GFP_ACCOUNT);
 	if (!cmap)
 		return ERR_PTR(-ENOMEM);
 

kernel/bpf/devmap.c

@@ -163,7 +163,7 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
 	if (!capable(CAP_NET_ADMIN))
 		return ERR_PTR(-EPERM);
 
-	dtab = kzalloc(sizeof(*dtab), GFP_USER | __GFP_ACCOUNT);
+	dtab = kzalloc(sizeof(*dtab), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!dtab)
 		return ERR_PTR(-ENOMEM);
 

kernel/bpf/hashtab.c

@@ -495,7 +495,7 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
 	struct bpf_htab *htab;
 	int err, i;
 
-	htab = kzalloc(sizeof(*htab), GFP_USER | __GFP_ACCOUNT);
+	htab = kzalloc(sizeof(*htab), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!htab)
 		return ERR_PTR(-ENOMEM);
 

kernel/bpf/local_storage.c

@@ -313,8 +313,8 @@ static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
 		/* max_entries is not used and enforced to be 0 */
 		return ERR_PTR(-EINVAL);
 
-	map = kmalloc_node(sizeof(struct bpf_cgroup_storage_map),
-			   __GFP_ZERO | GFP_USER | __GFP_ACCOUNT, numa_node);
+	map = kzalloc_node(sizeof(struct bpf_cgroup_storage_map),
+			   GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT, numa_node);
 	if (!map)
 		return ERR_PTR(-ENOMEM);
 

kernel/bpf/offload.c

@@ -372,7 +372,7 @@ struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
 	    attr->map_type != BPF_MAP_TYPE_HASH)
 		return ERR_PTR(-EINVAL);
 
-	offmap = kzalloc(sizeof(*offmap), GFP_USER);
+	offmap = kzalloc(sizeof(*offmap), GFP_USER | __GFP_NOWARN);
 	if (!offmap)
 		return ERR_PTR(-ENOMEM);
 

kernel/bpf/ringbuf.c

@@ -164,7 +164,7 @@ static struct bpf_map *ringbuf_map_alloc(union bpf_attr *attr)
 		return ERR_PTR(-E2BIG);
 #endif
 
-	rb_map = kzalloc(sizeof(*rb_map), GFP_USER | __GFP_ACCOUNT);
+	rb_map = kzalloc(sizeof(*rb_map), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!rb_map)
 		return ERR_PTR(-ENOMEM);
 

net/core/sock_map.c

@@ -41,7 +41,7 @@ static struct bpf_map *sock_map_alloc(union bpf_attr *attr)
 	    attr->map_flags & ~SOCK_CREATE_FLAG_MASK)
 		return ERR_PTR(-EINVAL);
 
-	stab = kzalloc(sizeof(*stab), GFP_USER | __GFP_ACCOUNT);
+	stab = kzalloc(sizeof(*stab), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!stab)
 		return ERR_PTR(-ENOMEM);
 
@@ -1076,7 +1076,7 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr)
 	if (attr->key_size > MAX_BPF_STACK)
 		return ERR_PTR(-E2BIG);
 
-	htab = kzalloc(sizeof(*htab), GFP_USER | __GFP_ACCOUNT);
+	htab = kzalloc(sizeof(*htab), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!htab)
 		return ERR_PTR(-ENOMEM);