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Date:	Wed, 17 Nov 2010 01:08:10 -0800
From:	Jeremy Fitzhardinge <>
To:	Jan Beulich <>
CC:	Jeremy Fitzhardinge <>,
	Mathieu Desnoyers <>,
	Nick Piggin <>,
	Peter Zijlstra <>,
	Srivatsa Vaddagiri <>,
	Linux Kernel Mailing List <>,
	Xen-devel <>,
	Avi Kivity <>, "H. Peter Anvin" <>,, Eric Dumazet <>,
	Linux Virtualization <>
Subject: Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

On 11/17/2010 12:56 AM, Jeremy Fitzhardinge wrote:
> 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:
> Should be OK in this case because there's no 64-bit values to be seen...
Hm, it fails when __ticket_t is 16 bits:

/home/jeremy/git/linux/arch/x86/include/asm/spinlock.h: Assembler messages:
/home/jeremy/git/linux/arch/x86/include/asm/spinlock.h:73: Error: suffix
or operands invalid for `or'

        lock; ors $1, 2(%rbx)   #,

So I don't think that's going to work out...

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