Re: [PATCH v5 1/7] mm: pass task and mm to do_madvise

[Minchan Kim]

On Fri, Feb 14, 2020 at 12:09:50PM -0700, Jens Axboe wrote:
> On 2/14/20 11:45 AM, Minchan Kim wrote:
> > diff --git a/fs/io_uring.c b/fs/io_uring.c
> > index 63beda9bafc5..1c7e9cd6c8ce 100644
> > --- a/fs/io_uring.c
> > +++ b/fs/io_uring.c
> > @@ -2736,7 +2736,7 @@ static int io_madvise(struct io_kiocb *req, struct io_kiocb **nxt,
> >  	if (force_nonblock)
> >  		return -EAGAIN;
> >  
> > -	ret = do_madvise(ma->addr, ma->len, ma->advice);
> > +	ret = do_madvise(NULL, current->mm, ma->addr, ma->len, ma->advice);
> >  	if (ret < 0)
> >  		req_set_fail_links(req);
> >  	io_cqring_add_event(req, ret);
> 
> I think we want to use req->work.mm here - it'll be the same as
> current->mm at this point, but it makes it clear that we're using a
> grabbed mm.

Will fix at respin. Thanks for the review!