// memory, so we use bootpgdir for the APs too. kalloc can return addresses
// above 4Mbyte (the machine may have much more physical memory than 4Mbyte), which
// aren't mapped by bootpgdir, so we must allocate a stack using boot_alloc();
- // This introduces the constraint that xv6 cannot invoke until after these last boot_alloc
- // invocations.
+ // This introduces the constraint that xv6 cannot use kalloc until after these
+ // last boot_alloc invocations.
stack = boot_alloc();
*(void**)(code-4) = stack + KSTACKSIZE;
*(void**)(code-8) = mpboot;