Re: [PATCH] mm: softdirty: unmapped addresses between VMAs are clean

[Peter Feiner]

On Wed, Sep 10, 2014 at 04:36:28PM -0700, Andrew Morton wrote:
> On Wed, 10 Sep 2014 16:24:46 -0700 Peter Feiner <pfeiner@xxxxxxxxxx> 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?
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