linux-kernel - Re: [PATCH v2] xen/block: Correctly define structures in public headers on ARM32 and ARM64

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Date:	Tue, 3 Dec 2013 13:03:33 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	Julien Grall <julien.grall@...aro.org>,
	xen-devel@...ts.xenproject.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Roger Pau Monne <roger.pau@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [PATCH v2] xen/block: Correctly define structures in public
 headers on ARM32 and ARM64

On Tue, Dec 03, 2013 at 05:03:10PM +0000, One Thousand Gnomes wrote:
> > itself. The protocol is defined by an entity which is external to Linux.
> > If this had been a bug in the IP protocol handling we would fix it and
> > move on. This case is no different IMHO.
> 
> Actually that is quite untrue. We are *very* careful that we can talk to
> other internet nodes that speak broken versions of TCP. There have even
> been changes made to protocol definitions during initial research to
> avoid tripping bugs in existing implementations.
> 
> > Once we set the ABI in stone then this is the sort of thing we will care
> > very much about (as we have done for many years on x86). Until then it
> > is not.
> 
> Maybe Xen doesn't, but perhaps Linux doesn't wish to be tarred with the
> same brush. What Xen decides is the official protocol is Xen's decision.
> What a Linux guest does to keep compatibility ought to follow what Linux
> does as policy.

I believe that this patch does not alter the x86 protocols.
Only the ARM based ones which are still in Technical Preview.

> 
> Alan
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