Re: [PATCH v7 1/4] spinlock: A new lockref structure for locklessupdate of refcount

[Benjamin Herrenschmidt]

On Thu, 2013-08-29 at 16:42 -0700, Linus Torvalds wrote:

> For architecture people (ie Ben, if you want to try this on ppc64),
> the thing that it needs from an architecture:
> 
>  - the raw_spinlock_t and the "unsigned long" needs to fit in a u64.

I assume you mean unsigned int ? :-)

 .../...

>  - the architecture needs to implement a simple
> "arch_spin_value_unlocked()" macro, which takes a raw_spinlock_t value
> and says whether it is unlocked or not.

What's wrong with the existing arch_spin_is_locked() ?

BTW. Do you have your test case at hand ?

Cheers,
Ben.

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