quoted

See mlock2();

SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
{
	vm_flags_t vm_flags = VM_LOCKED;

	if (flags & ~MLOCK_ONFAULT)
		return -EINVAL;

	if (flags & MLOCK_ONFAULT)
		vm_flags |= VM_LOCKONFAULT;

	return do_mlock(start, len, vm_flags);
}


VM_LOCKONFAULT always as VM_LOCKED set as well.

OK cool, that makes sense.

As with much kernel stuff, I knew this in the past. Then I forgot. Then I knew
again, then... :P if only somebody would write it down in a book...

And if there would be such a book in the makings, I would consider 
hurrying up and preordering it ;)

-- 
Cheers,

David / dhildenb