On Thu, Nov 04, 2021 at 02:47:03AM +0800, Jimmy Shiu wrote: > +++ b/mm/filemap.c > @@ -1271,7 +1271,7 @@ static inline bool folio_trylock_flag(struct folio *folio, int bit_nr, > /* How many times do we accept lock stealing from under a waiter? */ > int sysctl_page_lock_unfairness = 5; > > -static inline int folio_wait_bit_common(struct folio *folio, int bit_nr, > +static inline __sched int folio_wait_bit_common(struct folio *folio, int bit_nr, It's not clear to me whether folio_wait_bit_common() needs to be marked as __sched or whether marking its callers is sufficient, but I'm pretty sure you forgot to mark put_and_wait_on_page_locked() as __sched, which is an important one as it's now where we wait for readahead to finish when reading a file.
