[Xen-devel] [Question] Why code differs in construct_dom0?

["Shan, Haitao" <haitao.shan@xxxxxxxxx>]

Hi, Keir,

Please see the code shown below. I don't understand why pfn's definitions are 
different depending on whether NDEBUG is defined or not. Can you tell me why?
 
    while ( pfn < nr_pages )
    {
        if ( (page = alloc_chunk(d, nr_pages - d->tot_pages)) == NULL )
            panic("Not enough RAM for DOM0 reservation.\n");
        while ( pfn < d->tot_pages )
        {
            mfn = page_to_mfn(page);
#ifndef NDEBUG
#define pfn (nr_pages - 1 - (pfn - (alloc_epfn - alloc_spfn)))
#endif
            if ( !is_pv_32on64_domain(d) )
                ((unsigned long *)vphysmap_start)[pfn] = mfn;
            else
                ((unsigned int *)vphysmap_start)[pfn] = mfn;
            set_gpfn_from_mfn(mfn, pfn);
#undef pfn
            page++; pfn++;
        }
    }

Best Regards
Haitao Shan

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