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SubjectRe: [thisops uV2 04/10] x86: Support for this_cpu_add,sub,dec,inc_return
On Sat, 27 Nov 2010, Mathieu Desnoyers wrote:

> > +/*
> > + * Add return operation
> > + */
> > +#define percpu_add_return_op(var, val) \
> > +({ \
> > + typedef typeof(var) pao_T__; \
> > + typeof(var) pfo_ret__ = val; \
> > + if (0) { \
> > + pao_T__ pao_tmp__; \
> > + pao_tmp__ = (val); \
> > + (void)pao_tmp__; \
> > + } \
>
> OK, I'm dumb: why is the above needed ?

Ensure that the compiler agrees that *var and val are compatible. Taken
over from percpu_add_op().



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