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Open Source and information security mailing list archives
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Date: Fri, 26 Jun 2015 18:16:08 -0700 From: "Luis R. Rodriguez" <mcgrof@...e.com> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Russell King <linux@....linux.org.uk>, Stefano Stabellini <stefano.stabellini@...citrix.com> Cc: linux-fbdev <linux-fbdev@...r.kernel.org>, "Michael S. Tsirkin" <mst@...hat.com>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, Jan Beulich <jbeulich@...e.com>, Ville Syrjälä <ville.syrjala@...ux.intel.com>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>, Arnd Bergmann <arnd@...db.de>, Tomi Valkeinen <tomi.valkeinen@...com>, Daniel Vetter <daniel.vetter@...ll.ch>, Dave Airlie <airlied@...hat.com>, Ingo Molnar <mingo@...e.hu>, Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>, Casey Leedom <leedom@...lsio.com>, Antonino Daplas <adaplas@...il.com>, Suresh Siddha <sbsiddha@...il.com>, Stefan Bader <stefan.bader@...onical.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Juergen Gross <jgross@...e.com>, Toshi Kani <toshi.kani@...com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andy Lutomirski <luto@...capital.net>, David Vrabel <david.vrabel@...rix.com>, "venkatesh.pallipadi@...el.com" <venkatesh.pallipadi@...el.com>, Roger Pau Monné <roger.pau@...rix.com> Subject: Re: [Xen-devel] [PATCH v7 5/9] PCI: Add pci_iomap_wc() variants On Fri, Jun 26, 2015 at 4:54 PM, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote: > On Fri, 2015-06-26 at 15:41 -0700, Luis R. Rodriguez wrote: > >> > It wasn't nullified for the main user at the time, the fb. And I >> > mentioned an IB adapter or two for which the code had been hand >> tuned. >> >> This still means there could be some affected drivers when used on >> powerpc, no? > > Yes. In fact what about things like ARM who also have barriers in their > writel() ? Won't they also break WC ? Not sure if they have that write-combine notion on their CPUs / interconnects. Russel, Stefano, does ARM have write-combining ? Luis -- 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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