Increase the size of the page table on 64-bit PowerPC machines as a

bandaid to prevent exhaustion of the primary and secondary hash groups
in the event of extreme stress on the PMAP layer (e.g. a forkbomb). This
wastes memory, and should be revised to properly handle PTEG spills instead.

Suggested by:	grehan
Approved by:	re (kensmith)

sys/powerpc/aim/mmu_oea64.c

@@ -781,8 +781,6 @@ moea64_bridge_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernele
 
 	while (moea64_pteg_count < physmem)
 		moea64_pteg_count <<= 1;
-
-	moea64_pteg_count >>= 1;
 #endif /* PTEGCOUNT */
 
 	size = moea64_pteg_count * sizeof(struct lpteg);