[Xen-devel] Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 11/17/2010 12:52 AM, Jeremy Fitzhardinge wrote:
> But, yes, %z0 sounds interesting.  Is it documented anywhere?  I think
> I've tried to use it in the past and run into gcc bugs.
This one: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39590

Should be OK in this case because there's no 64-bit values to be seen...

    J

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