[PATCH v6 2/4] powerpc: atomic: Implement atomic{, 64}_*_return_* variants

[Boqun Feng]

Hi all,

I will resend this one to avoid a potential conflict with:

http://article.gmane.org/gmane.linux.kernel/2116880

by open coding smp_lwsync() with:

__asm__ __volatile__(PPC_ACQUIRE_BARRIER "" : : : "memory");

Regards,
Boqun
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