Messages in this thread | | | Date | Thu, 12 Dec 2013 16:11:59 +0100 | From | Roger Pau Monné <> | Subject | Re: [Xen-devel] [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64 |
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On 12/12/13 15:19, Ian Campbell wrote: > On Tue, 2013-12-03 at 15:40 +0000, Julien Grall wrote: >> On ARM (32 bits and 64 bits), the double-word is 8-bytes aligned. This will >> result on different structure from Xen and Linux repositories. >> >> As Linux is using __packed__ attribute, it must have a 4-bytes padding before >> each "id" field. >> >> This change breaks guest block support with older kernel. IMHO, it's acceptable >> because Xen on ARM is still on Tech Preview and the hypercall ABI is not yet >> freezed. >> >> Only one architecture (x86_32) doesn't have 64-bit ABI for the block interface. >> Don't add padding if Linux is compiled for this architecture. > > Konrad asked for confirmation that this didn't change x86.
I've also tested this using various combinations of kernels, and it seems to be perfectly fine, so:
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
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