[PATCHv5] atomic: add *_dec_not_zero

[Sven Eckelmann]

On Sunday 04 December 2011 21:33:16 Russell King - ARM Linux wrote:
[...]
> > +#define atomic64_dec_not_zero(v)	atomic64_add_unless((v), -1LL, 0LL)
> 
> I think this is rather silly - all these definitions are very similar to
> each other.  Is there really no way to put this into include/linux/atomic.h,
> maybe as something like:
> 
> #ifndef atomic64_dec_not_zero
> #define atomic64_dec_not_zero(v)	atomic64_add_unless((v), -1, 0)
> #endif
> 
> and avoid having to add essentially the same definition to 12 individual
> files?
> 
> Architectures which want to override it can do by the following:
> 
> #define atomic64_dec_not_zero		atomic64_dec_not_zero
> 
> which won't have any effect on C nor asm code.

 * https://lkml.org/lkml/2011/5/8/15
 * https://lkml.org/lkml/2011/5/8/16
 * https://lkml.org/lkml/2011/5/8/321

Kind regards,
	Sven
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