From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f51.google.com (mail-wm0-f51.google.com [74.125.82.51]) by kanga.kvack.org (Postfix) with ESMTP id D0E056B025C for ; Thu, 10 Dec 2015 06:40:09 -0500 (EST) Received: by mail-wm0-f51.google.com with SMTP id v187so28627278wmv.1 for ; Thu, 10 Dec 2015 03:40:09 -0800 (PST) Received: from mail-wm0-f44.google.com (mail-wm0-f44.google.com. [74.125.82.44]) by mx.google.com with ESMTPS id n123si18949668wmd.67.2015.12.10.03.40.07 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Dec 2015 03:40:07 -0800 (PST) Received: by wmec201 with SMTP id c201so20821053wme.1 for ; Thu, 10 Dec 2015 03:40:07 -0800 (PST) Date: Thu, 10 Dec 2015 12:40:05 +0100 From: Michal Hocko 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> Sender: owner-linux-mm@kvack.org List-ID: To: Sebastian Frias Cc: Marc Gonzalez , linux-mm , LKML 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org