Re: [Qemu-devel] [Xen-devel] [PATCH] xen: fix qdisk BLKIF_OP_DISCARD for 32/64 word size mix

[Juergen Gross <jgross@suse.com>]

On 16/06/16 13:24, Paul Durrant wrote:
>> -----Original Message-----
>> From: Xen-devel [mailto:xen-devel-bounces@lists.xen.org] On Behalf Of
>> Juergen Gross
>> Sent: 16 June 2016 11:02
>> To: qemu-devel@nongnu.org; xen-devel@lists.xensource.com
>> Cc: Anthony Perard; Juergen Gross; sstabellini@kernel.org;
>> kraxel@redhat.com
>> Subject: [Xen-devel] [PATCH] xen: fix qdisk BLKIF_OP_DISCARD for 32/64
>> word size mix
>>
>> In case the word size of the domU and qemu running the qdisk backend
>> differ BLKIF_OP_DISCARD will not work reliably, as the request
>> structure in the ring have different layouts for different word size.
>>
>> Correct this by copying the request structure in case of different
>> word size element by element in the BLKIF_OP_DISCARD case, too.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
> 
> Would it not be better to re-import the canonical blkif header as a whole rather than cherry-picking like this? You'd need to post-process to maintain style and possibly change some names for compatibility etc. but probably nothing beyond what indent and a simple [s]ed script can do.
> I did broadly the same thing to re-import the netif header into Linux recently.

It's a little bit more than indent/sed, but nothing really scary.

I'll do it.


Juergen