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Date: Tue, 3 Dec 2013 11:15:22 +0000 From: Ian Campbell <Ian.Campbell@...rix.com> To: Jan Beulich <JBeulich@...e.com> CC: Roger Pau Monne <roger.pau@...rix.com>, David Vrabel <david.vrabel@...rix.com>, Stefano Stabellini <stefano.stabellini@...citrix.com>, Julien Grall <julien.grall@...aro.org>, <xen-devel@...ts.xenproject.org>, BorisOstrovsky <boris.ostrovsky@...cle.com>, <linux-kernel@...r.kernel.org> Subject: Re: [Xen-devel] [PATCH RFC] xen-block: correctly define structures in public headers On Tue, 2013-12-03 at 11:11 +0000, Jan Beulich wrote: > >>> On 03.12.13 at 12:05, Ian Campbell <Ian.Campbell@...rix.com> wrote: > > On Tue, 2013-12-03 at 11:57 +0100, Roger Pau Monne wrote: > >> Using __packed__ on the public interface is not correct, this > >> structures should be compiled using the native ABI, and __packed__ > >> should only be used in the backend counterpart of those structures > >> (which needs to handle different ABIs). > >> > >> This was even worse in the ARM case, where the Linux kernel was > >> incorrectly using the X86_32 protocol ABI. This patch fixes it, but > >> also breaks compatibility, so an ARM DomU kernel compiled with > >> this patch will fail to communicate with PV disk devices unless the > >> Dom0 also has this patch. > > > > This is acceptable IMHO, the ARM ABI is clearly defined and previous > > kernels were simply buggy. The fact that front and backend were > > equivalently buggy and so it happened to work is not an excuse. > > But afaics the change is not just to the ARM form of the ABI, > but to x86 (32- and 64-bit) too. And that clearly must not be > altered. I understood there to be no (intentional) change to the x86 ABIs here. Obviously that would be a bug in the patch. Ian. -- 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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