From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754719AbbLJLkL (ORCPT ); Thu, 10 Dec 2015 06:40:11 -0500 Received: from mail-wm0-f48.google.com ([74.125.82.48]:37237 "EHLO mail-wm0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751220AbbLJLkJ (ORCPT ); Thu, 10 Dec 2015 06:40:09 -0500 Date: Thu, 10 Dec 2015 12:40:05 +0100 From: Michal Hocko To: Sebastian Frias Cc: Marc Gonzalez , linux-mm , LKML Subject: Re: m(un)map kmalloc buffers to userspace Message-ID: <20151210114005.GF19496@dhcp22.suse.cz> References: <5667128B.3080704@sigmadesigns.com> <20151209135544.GE30907@dhcp22.suse.cz> <566835B6.9010605@sigmadesigns.com> <20151209143207.GF30907@dhcp22.suse.cz> <56684062.9090505@sigmadesigns.com> <20151209151254.GH30907@dhcp22.suse.cz> <56684A59.7030605@sigmadesigns.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <56684A59.7030605@sigmadesigns.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 09-12-15 16:35:53, Sebastian Frias wrote: [...] > We've seen that drivers/media/pci/zoran/zoran_driver.c for example seems to > be doing as us kmalloc+remap_pfn_range, This driver is broken - I will post a patch. > is there any guarantee (or at least an advised heuristic) to determine > if a driver is "current" (ie: uses the latest APIs and works)? OK, it seems I was overly optimistic when directing you to existing drivers. Sorry about that I wasn't aware you could find such a terrible code there. Please refer to Linux Device Drivers book which should give you a much better lead (e.g. http://www.makelinux.net/ldd3/chp-15-sect-2) -- Michal Hocko SUSE Labs