Re: [patch 2/8] mutex subsystem, add asm-generic/mutex-[dec|xchg].h implementations

[Linus Torvalds <torvalds@osdl.org>]

On Fri, 23 Dec 2005, Ingo Molnar wrote:
>
> add the two generic mutex fastpath implementations.

Now this looks more like it. This is readable code without any #ifdef's in 
the middle.

Now the only #ifdef's seem to be for mutex debugging. Might it be 
worthwhile to have a generic debugging, that just uses spinlocks and just 
accept that it's going to be slow, but shared across absolutely all 
architectures?

Then you could have <linux/mutex.h> just doing a single

	#ifdef CONFIG_MUTEX_DEBUG
	# include <asm-generic/mutex-dbg.h>
	#else
	# include <asm/mutex.h>
	#endif

and have muted-dbg.h just contain prototypes (no point in inlining them, 
they're going to be big anyway) and then have a 

	obj$(CONFIG_MUTEX_DEBUG) += mutex-debug.c

in the kernel/ subdirectory? That way you could _really_ have a clean 
separation, with absolutely zero pollution of any architecture mess or 
debugging #ifdef's in any implementation code.

At that point I'd like to switch to mutexes just because the code is 
cleaner!

		Linus
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