Re: [thisops uV2 04/10] x86: Support forthis_cpu_add,sub,dec,inc_return

[Christoph Lameter]

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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