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SubjectRe: [PATCH] Scalable CPU bitmasks
> >  NOTE:   The cpumap_to_ulong() and cpumap_ulong_to_cpumap() interfaces
> > are provided specifically for migration. In their current
> > form, they call BUG() if NR_CPUS is defined to be greater
> > than the bit-size of (unsigned long).
> Why BUG? NR_CPUS is known at compile time, is there a reason why you
> can't use a call to an undefined function in order to get a link time
> error message? (like __bad_udelay in linux/asm-i386/udelay.h)

why that, rather than #error ?

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