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Date: Fri, 18 Oct 2013 16:46:00 +0100 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: Russell King - ARM Linux <linux@....linux.org.uk> CC: Stefano Stabellini <stefano.stabellini@...citrix.com>, <xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <konrad.wilk@...cle.com>, <Ian.Campbell@...rix.com>, <will.deacon@....com> Subject: Re: [PATCH v8 08/19] arm/xen: get_dma_ops: return xen_dma_ops if we are running as xen_initial_domain On Fri, 18 Oct 2013, Russell King - ARM Linux wrote: > On Fri, Oct 18, 2013 at 01:22:18PM +0100, Stefano Stabellini wrote: > > Russell, > > are you OK with this patch? > > Only concern is why the change is soo large. > > > > -static inline struct dma_map_ops *get_dma_ops(struct device *dev) > > > +static inline struct dma_map_ops *__generic_dma_ops(struct device *dev) > > > { > > > if (dev && dev->archdata.dma_ops) > > > return dev->archdata.dma_ops; > > > return &arm_dma_ops; > > > } > > > > > > +static inline struct dma_map_ops *get_dma_ops(struct device *dev) > > > +{ > > > + if (xen_initial_domain()) > > > + return xen_dma_ops; > > > + else > > > + return __generic_dma_ops(dev); > > > +} > > > + > > What's wrong with: > > static inline struct dma_map_ops *get_dma_ops(struct device *dev) > { > + if (xen_initial_domain()) > + return xen_dma_ops; > if (dev && dev->archdata.dma_ops) > return dev->archdata.dma_ops; > return &arm_dma_ops; > } xen_dma_ops functions might have to call back the native implementation. With the above there is no way for a xen_dma_ops function to get to archdata.dma_ops or arm_dma_ops. This is the reason why this patch introduces __generic_dma_ops. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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