linux-kernel - Re: mm: BUG in unmap_page

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Message-ID: <53E989FB.5000904@oracle.com>
Date:	Mon, 11 Aug 2014 23:28:59 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: mm: BUG in unmap_page_range

On 08/05/2014 09:04 PM, Sasha Levin wrote:
> Thanks Hugh, Mel. I've added both patches to my local tree and will update tomorrow
> with the weather.
> 
> Also:
> 
> On 08/05/2014 08:42 PM, Hugh Dickins wrote:
>> One thing I did wonder, though: at first I was reassured by the
>> VM_BUG_ON(!pte_present(pte)) you add to pte_mknuma(); but then thought
>> it would be better as VM_BUG_ON(!(val & _PAGE_PRESENT)), being stronger
>> - asserting that indeed we do not put NUMA hints on PROT_NONE areas.
>> (But I have not tested, perhaps such a VM_BUG_ON would actually fire.)
> 
> I've added VM_BUG_ON(!(val & _PAGE_PRESENT)) in just as a curiosity, I'll
> update how that one looks as well.

Sorry for the rather long delay.

The patch looks fine, the issue didn't reproduce.

The added VM_BUG_ON didn't trigger either, so maybe we should consider adding
it in.


Thanks,
Sasha

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