Re: [cpuops cmpxchg double V3 3/5] Generic support forthis_cpu_cmpxchg_double

[Steven Rostedt]

On Fri, 2011-02-25 at 14:44 -0600, Christoph Lameter wrote:
> On Fri, 25 Feb 2011, Steven Rostedt wrote:
> 
> > > +	VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));		\
> > > +	VM_BUG_ON((unsigned long)(&pcp2) != (unsigned long)(&pcp1) + sizeof(pcp1));\
> > > +	VM_BUG_ON(sizeof(pcp1) != sizeof(pcp2));			\
> >
> > Since this is a macro, and it looks like all these are constants (sizeof
> > and addresses), couldn't you just do a BUILD_BUG_ON() instead?
> 
> The addresses are not constant.

I was thinking that if these are per_cpu then they would be global and
thus constant. But those are done at link time, which is too late.

OK, nevermind ;)

-- Steve



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