On Wed, 10 Sep 2014 22:41:04 -0700 Peter Feiner <pfei...@google.com> wrote:
> On Wed, Sep 10, 2014 at 04:36:28PM -0700, Andrew Morton wrote:
> > On Wed, 10 Sep 2014 16:24:46 -0700 Peter Feiner <pfei...@google.com> wrote:
> > > @@ -1048,32 +1048,51 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned
> > > long addr, unsigned long end,
> > > + while (1) {
> > > + unsigned long vm_start = end;
> >
> > Did you really mean to do that? If so, perhaps a little comment to
> > explain how it works?
>
> It's the same idea that I used in the pagemap_pte_hole patch that I submitted
> today: if vma is NULL, then we fill in the pagemap from (addr) to (end) with
> non-present pagemap entries.
>
> Should I submit a v2 with a comment?
I spent quite some time staring at that code wondering wtf, so anything
you can do to clarify it would be good.
I think a better name would be plain old "start", to communicate that
it's just a local convenience variable. "vm_start" means "start of a
vma" and that isn't accurate in this context; in fact it is misleading.
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