On Wed, Sep 30, 2020 at 10:52:55PM -0400, Qian Cai wrote: > diff --git a/include/linux/watch_queue.h b/include/linux/watch_queue.h > index 5e08db2adc31..20665fbe0552 100644 > --- a/include/linux/watch_queue.h > +++ b/include/linux/watch_queue.h > @@ -123,5 +123,9 @@ static inline void remove_watch_list(struct watch_list *wlist, u64 id) > #define watch_sizeof(STRUCT) (sizeof(STRUCT) << WATCH_INFO_LENGTH__SHIFT) > > #endif > +static inline int watch_queue_init(struct pipe_inode_info *pipe) > +{ > + return -ENOPKG; > +} This needs to be conditional on !CONFIG_WATCH_QUEUE. - Eric