On Fri, 1 May 2020 01:41:58 +0530 Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote: > As per documentation, pin_user_pages_fast() & get_user_pages_fast() > will return 0, if nr_pages <= 0. But this can be figure out only after > going inside the internal_get_user_pages_fast(). > > This can be handled early. Adding a check for the same. Calling get_user_pages() for (nrpages <= 0) is a nonsensical thing to do so it isn't a thing we should care to optimize. Adding new checks will actually slow down the use cases which we *do* care about. And it adds more code.
