From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH 0/6] drivers/dma: drop modular code from non modular drivers Date: Thu, 10 Dec 2015 00:29:27 +0100 Message-ID: <7162994.ydt4N8UgZZ@wuerfel> References: <1449703322-17762-1-git-send-email-paul.gortmaker@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <1449703322-17762-1-git-send-email-paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: Paul Gortmaker , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alexandre Courbot , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Stephen Warren , Vinod Koul , Haojian Zhuang , Laxman Dewangan , Thierry Reding , dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Dan Williams , Robert Jarzmik , Daniel Mack List-Id: linux-tegra@vger.kernel.org On Wednesday 09 December 2015 18:21:56 Paul Gortmaker wrote: > This series of commits is a slice of a larger project to ensure > people don't have dead code for module removal in non-modular > drivers. Overall there is roughly 5k lines of dead code in the > kernel due to this. > > There is a quasi-separate theme, in that some of the drivers were > allowing an unbind implicitly since it is enabled by default. But > for core DMA infrastructure drivers, this doesn't seem useful -- so > we also disable that here which allows us to delete any ".remove" > functions from the drivers that would otherwise be called during the > (impossible to trigger) module removal. > > Since ARM covers these files the best of all architectures, each > file was build tested for allmodconfig on ARM, which at the same > time confirms that the files are not built with "CC [M]" -- hence > genuinely non-modular. > > My testing and the larger patch series in general has been done > against the latest linux-next tree. > > We are in the process of changing the DMA drivers to a new way of passing the "filter" function around. We can soon build them all as loadable modules again. Arnd