Peter Zijlstra wrote:

On Wed, 2008-08-27 at 12:56 +0200, Nick Piggin wrote:

  

quoted

BTW. I wonder about other architectures that are of interest to -rt? Like
mips or arm perhaps... Any plans to implement ticket locks on those, or
do they not tend to be used in SMP configurations on -rt yte?
    

I think both are starting to show more and more SMP machines, so yes,
eventually we'll want ticket locks for them too.

That said, I'm not aware of anyone working on it - I suppose we could
poke the regular arch maintainers.. Ralf, Russell ?

  

As an aside:  I have an implementation of C-based ticket lock
replacements for raw_spinlock_t that I could post.  I never posted them
because I mostly care about x86 and Nick's solution is superior there
since its hand-tuned asm.  But mine could be used in places that have
not yet written arch support but need FIFO.  I basically have it as a
config option to enable "generic fifo spinlocks" or something like that.

-Greg