linux-kernel - Re: [PATCH] memory-hotplug: Fix bad area access on dissolve_free_huge

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Message-ID: <57D97CAF.7080005@linux.intel.com>
Date:   Wed, 14 Sep 2016 09:37:03 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Rui Teng <rui.teng@...ux.vnet.ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Santhosh G <santhog4@...ibm.com>
Subject: Re: [PATCH] memory-hotplug: Fix bad area access on
 dissolve_free_huge_pages()

On 09/14/2016 09:33 AM, Rui Teng wrote:
> 
> How about return the size of page freed from dissolve_free_huge_page(),
> and jump such step on pfn?

That would be a nice improvement.

But, as far as describing the initial problem, can you explain how the
tail pages still ended up being PageHuge()?  Seems like dissolving the
huge page should have cleared that.