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> BTW, while reading the ISA document I couldn't help noticing that LWARX
> is clearly specified to operate on 4-byte quantities (there's LDARX if
> you want to use 8-byte).  Which seems to mean that this bit in s_lock.h
> just represents bogus waste of space:
> 
> #if defined(__ppc64__) || defined(__powerpc64__)
> typedef unsigned long slock_t;
> #else
> typedef unsigned int slock_t;
> #endif
> 
> Shouldn't we just make slock_t be "int" for both PPC and PPC64?

I'd like it to be untouched for this TAS_SPIN for powerpc
discussion, since it seems it remainds like this for several
years and maybe it needs some more careful consideration
especially for sign extension$B!D(B

Regards,
Manabu Ori