Re: [PATCH 00/18] x86: Ticket lock + cmpxchg cleanup

[Jeremy Fitzhardinge]

On 08/24/2011 03:53 PM, Linus Torvalds wrote:
> On Wed, Aug 24, 2011 at 1:10 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>> Could we just kill SMP support for OOSTORE machines now?  That would be
>> the cleanest possible fix...
> No it wouldn't. The asm version would *still* be cleaner than the "C
> plus random barriers".
>
> It's not like the C version is "portable" in any case.

If there's no need to have a locked instruction, then it could simply be:

    barrier();
    lock->head++;
    barrier();

with no need for asm at all.

    J
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