Re: [PATCH v2 0/3] mm/get_user_pages_fast fixes, cleanups

2018-04-07 Thread Michael S. Tsirkin
On Fri, Apr 06, 2018 at 01:08:02PM -0700, Andrew Morton wrote: > On Fri, 6 Apr 2018 00:03:48 +0300 "Michael S. Tsirkin" > wrote: > > > Turns out get_user_pages_fast and __get_user_pages_fast return different > > values on error when given a single page: __get_user_pages_fast returns > > 0. get_

Re: [PATCH v2 0/3] mm/get_user_pages_fast fixes, cleanups

2018-04-06 Thread Andrew Morton
On Fri, 6 Apr 2018 00:03:48 +0300 "Michael S. Tsirkin" wrote: > Turns out get_user_pages_fast and __get_user_pages_fast return different > values on error when given a single page: __get_user_pages_fast returns > 0. get_user_pages_fast returns either 0 or an error. > > Callers of get_user_pages