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SubjectRe: [PATCH 13/14] x86/ticketlock: add slowpath logic
>>> On 17.11.10 at 10:08, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> 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: 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...
> 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...

Indeed, it's only with 4.5 that non-float operands are properly
supported here. Sad.

Jan



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