bpf: use rcu_migrate_* for bpf_inode_storage_free()

Replace the migrate_disable/migrate_enable with
rcu_migrate_disable/rcu_migrate_enable in bpf_inode_storage_free to obtain
better performance when PREEMPT_RCU is not enabled.

Signed-off-by: Menglong Dong <[email protected]>

Author: image-dragon

kernel/bpf/bpf_inode_storage.c

@@ -62,7 +62,7 @@ void bpf_inode_storage_free(struct inode *inode)
 	if (!bsb)
 		return;
 
-	migrate_disable();
+	rcu_migrate_disable();
 	rcu_read_lock();
 
 	local_storage = rcu_dereference(bsb->storage);
@@ -72,7 +72,7 @@ void bpf_inode_storage_free(struct inode *inode)
 	bpf_local_storage_destroy(local_storage);
 out:
 	rcu_read_unlock();
-	migrate_enable();
+	rcu_migrate_enable();
 }
 
 static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)