Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch

[Ingo Molnar]

* Nicolas Pitre <nico@xxxxxxx> wrote:

> > Please consider using (a variant of) xchg() instead.  Although 
> > atomic_dec() is available on all architectures, its implementation is 
> > far from being the most efficient thing to do for them all.
> 
> Actually, the best thing to do is to let the architecture do what is 
> the most efficient. [...]

i have already added something similar. Furthermore, i have also 
eliminated the CMPXCHG requirement from MUTEX_FASTPATH, which should 
open ARM up to the generic lockless fastpath. (but you can still choose 
to reimplement it in the architecture) I'll send a new queue later 
today.

	Ingo
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