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

[Andi Kleen]

> - i introduced a 'type-sensitive' macro wrapper that switches down() 
>   (and the other APIs) to either to the assembly variant (if the 
>   variable's type is struct compat_semaphore), or switches it to the new 
>   generic mutex (if the type is struct semaphore), at build-time. There 
>   is no runtime overhead due to this build-time-switching.

Didn't that drop compatibility with 2.95?  The necessary builtins
are only in 3.x. 

Not that I'm not in favour - I would like to use C99 everywhere 
and it would get of the ugly spinlock workaround for i386
and x86-64 doesn't support earlier compilers anyways - 
but others might not agree.

-Andi
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