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

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Date:	Wed, 10 Sep 2014 22:41:04 -0700
From:	Peter Feiner <pfeiner@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jamie Liu <jamieliu@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH] mm: softdirty: unmapped addresses between VMAs are clean

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@...gle.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?
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