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    SubjectRe: [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: 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...

    J


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