bpf: use rcu_read_lock_dont_migrate() for bpf_inode_storage_free()

Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in
bpf_inode_storage_free to obtain better performance when PREEMPT_RCU is
not enabled.

Signed-off-by: Menglong Dong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: image-dragon

kernel/bpf/bpf_inode_storage.c

@@ -62,17 +62,15 @@ void bpf_inode_storage_free(struct inode *inode)
 	if (!bsb)
 		return;
 
-	migrate_disable();
-	rcu_read_lock();
+	rcu_read_lock_dont_migrate();
 
 	local_storage = rcu_dereference(bsb->storage);
 	if (!local_storage)
 		goto out;
 
 	bpf_local_storage_destroy(local_storage);
 out:
-	rcu_read_unlock();
-	migrate_enable();
+	rcu_read_unlock_migrate();
 }
 
 static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)