prevbase = lmb.memory.region[i-1].physbase; 
prevbase = lmb.memory.region[i-1].base; 
void __init mm_init_ppc64(void){#ifndef CONFIG_PPC_ISERIES	unsigned long i;#endif	ppc64_boot_msg(0x100, "MM Init");	/* This is the story of the IO hole... please, keep seated,	 * unfortunately, we are out of oxygen masks at the moment.	 * So we need some rough way to tell where your big IO hole	 * is. On pmac, it's between 2G and 4G, on POWER3, it's around	 * that area as well, on POWER4 we don't have one, etc...	 * We need that as a "hint" when sizing the TCE table on POWER3	 * So far, the simplest way that seem work well enough for us it	 * to just assume that the first discontinuity in our physical	 * RAM layout is the IO hole. That may not be correct in the future	 * (and isn't on iSeries but then we don't care ;)	 */#ifndef CONFIG_PPC_ISERIES	for (i = 1; i < lmb.memory.cnt; i++) {		unsigned long base, prevbase, prevsize;		prevbase = lmb.memory.region[i-1].physbase;		prevsize = lmb.memory.region[i-1].size;		base = lmb.memory.region[i].physbase;		if (base > (prevbase + prevsize)) {			io_hole_start = prevbase + prevsize;			io_hole_size = base  - (prevbase + prevsize);			break;		}	}#endif /* CONFIG_PPC_ISERIES */	if (io_hole_start)		printk("IO Hole assumed to be %lx -> %lx\n",		       io_hole_start, io_hole_start + io_hole_size - 1);	ppc64_boot_msg(0x100, "MM Init Done");}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/180379dcefb39e8bd05d562b0685e9084dffcc0a/init.c/buggy/arch/ppc64/mm/init.c