Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation

Oliver Neukum
2005-12-13T12:47:30Z

Am Dienstag, 13. Dezember 2005 11:34 schrieb Ingo Molnar:

> the cost of a spinlock-based generic_cmpxchg could be significantly
> reduced by adding a generic_cmpxchg() variant that also includes a
> 'spinlock pointer' parameter.
>
> Architectures that do not have the instruction, can use the specified
> spinlock to do the cmpxchg. This means that there wont be one single
> global spinlock to emulate cmpxchg, but the mutex's own spinlock can be
> used for it.

Can't you use the pointer as a hash input?

Regards
Oliver