linux-kernel - Re: [PATCH] mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page

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Message-Id: <20150122120820.8c279cf8.akpm@linux-foundation.org>
Date:	Thu, 22 Jan 2015 12:08:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shiraz Hashim <shashim@...eaurora.org>
Cc:	linux-mm@...ck.org, oleg@...hat.com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, n-horiguchi@...jp.nec.com
Subject: Re: [PATCH] mm: pagewalk: call pte_hole() for VM_PFNMAP during
 walk_page_range

On Wed, 21 Jan 2015 11:43:13 +0530 Shiraz Hashim <shashim@...eaurora.org> wrote:

> walk_page_range silently skips vma having VM_PFNMAP set,
> which leads to undesirable behaviour at client end (who
> called walk_page_range). For example for pagemap_read,
> when no callbacks are called against VM_PFNMAP vma,
> pagemap_read may prepare pagemap data for next virtual
> address range at wrong index.

This changelog doesn't have enough information for me to be able to
work out whether a -stable backport is needed.  Please always describe
the user-visible effects of a bug.

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