Re: [PATCH 0/4] mm: permit guard regions for file-backed/shmem mappings

[David Hildenbrand]

> > 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