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

[Nick Piggin]

David Howells wrote:
> The attached patch introduces a simple mutex implementation as an alternative
> to the usual semaphore implementation where simple mutex functionality is all
> that is required.
>
> This is useful in two ways:
>
>  (1) A number of archs only provide very simple atomic instructions (such as
>      XCHG on i386, TAS on M68K, SWAP on FRV) which aren't sufficient to
>      implement full semaphore support directly. Instead spinlocks must be
>      employed to implement fuller functionality.

We have atomic_cmpxchg. Can you use that for a sufficient generic
implementation?

--
SUSE Labs, Novell Inc.

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