From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH 2/5] dma-mapping: move the dma_coherent flag to struct device Date: Tue, 11 Sep 2018 10:19:52 +0200 Message-ID: <20180911081952.GA17267@kroah.com> References: <20180910060533.27172-1-hch@lst.de> <20180910060533.27172-3-hch@lst.de> <20180910161350.GA10380@kroah.com> <20180911064636.GA6214@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20180911064636.GA6214-jcswGhMUV9g@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Christoph Hellwig Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org, Paul Burton , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Robin Murphy List-Id: iommu@lists.linux-foundation.org On Tue, Sep 11, 2018 at 08:46:36AM +0200, Christoph Hellwig wrote: > On Mon, Sep 10, 2018 at 06:13:50PM +0200, Greg Kroah-Hartman wrote: > > > +#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ > > > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ > > > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) > > > + bool dma_coherent:1; > > > +#endif > > > > It's just one bit, why not always have it enabled here? If the arch > > uses it or doesn't, no big deal. > > > > Or are you using this to "catch" arches that mess something up? > > Yes, that is the intent - I don't want architectures to accidentally > set it while not selecting the non-coherent infrastructure, as it > won't have an effect. Ok, fine with me: Acked-by: Greg Kroah-Hartman