linux-kernel - Re: [PATCH 1/3] HWPOISON, hugetlbfs: fix warning on freeing hwpoisoned hugepage

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Message-ID: <878v9acn5m.fsf@linux.vnet.ibm.com>
Date:	Fri, 07 Dec 2012 13:24:45 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi.kleen@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] HWPOISON, hugetlbfs: fix warning on freeing hwpoisoned hugepage

Naoya Horiguchi <n-horiguchi@...jp.nec.com> writes:

> On Fri, Dec 07, 2012 at 11:06:41AM +0530, Aneesh Kumar K.V wrote:
> ...
>> > From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
>> > Date: Thu, 6 Dec 2012 20:54:30 -0500
>> > Subject: [PATCH v2] HWPOISON, hugetlbfs: fix warning on freeing hwpoisoned
>> >  hugepage
>> >
>> > This patch fixes the warning from __list_del_entry() which is triggered
>> > when a process tries to do free_huge_page() for a hwpoisoned hugepage.
>> 
>> 
>> Can you get a dump stack for that. I am confused because the page was
>> already in freelist, and we deleted it from the list and set the
>> refcount to 1. So how are we reaching free_huge_page() again ?
>
> free_huge_page() can be called for hwpoisoned hugepage from unpoison_memory().
> This function gets refcount once and clears PageHWPoison, and then puts
> refcount twice to return the hugepage back to free pool.
> The second put_page() finally reaches free_huge_page().
>

Can we add this also to the commit message ?. With that you can add

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Thanks
-aneesh

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