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Date: Mon, 10 Nov 2014 12:41:58 +0000 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: Stefano Stabellini <stefano.stabellini@...citrix.com> CC: Catalin Marinas <catalin.marinas@....com>, Will Deacon <Will.Deacon@....com>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>, "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>, "Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>, "david.vrabel@...rix.com" <david.vrabel@...rix.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH v7 3/8] arm64: introduce is_device_dma_coherent On Mon, 10 Nov 2014, Stefano Stabellini wrote: > > BTW, pfn_valid() is more expensive than simply comparing the mfn with > > pfn for dom0. The calling code knows this already and it may be quicker > > to simply pass a "bool foreign" argument. > > Good point, I can compare mfn and pfn here. > I cannot do the same in unmap_page and the various sync operations, > because there is no pfn available, but maybe I could use > set_page_private to set a flag. I'll think about it. But of course there is no struct page either so I think pfn_valid will have to stay in unmap and sync -- 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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