[PATCH] atomic: add *_dec_not_zero

Russell King - ARM Linux wrote:
[...]

Do we need atomic_dec_not_zero() et.al. in every arch header - is there no
generic header which it could be added to?

Mike Frysinger already tried to answer it in 
[ref]:

that's what asm-generic is for.  if the arch isnt using it, it's
either because the arch needs to convert to it, or they're using SMP
and asm-generic doesnt yet support that for atomic.h.

for example, the Blackfin port only needed updating for the SMP case.
in the non-SMP case, we're getting the def from asm-generic/atomic.h.
-mike

Feel free to change that but I just followed the style used by all other 
macros and will not redesign the complete atomic*.h idea.

thanks,
	Sven
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