linux-kernel - Re: [PATCH v2] mm: cma: fix CMA aligned offset calculation

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Message-ID: <54F114D0.3060306@broadcom.com>
Date:	Fri, 27 Feb 2015 17:07:28 -0800
From:	Danesh Petigara <dpetigara@...adcom.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	<m.szyprowski@...sung.com>, <mina86@...a86.com>,
	<iamjoonsoo.kim@....com>, <aneesh.kumar@...ux.vnet.ibm.com>,
	<laurent.pinchart+renesas@...asonboard.com>,
	<gregory.0xf0@...il.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2] mm: cma: fix CMA aligned offset calculation

On 2/27/2015 3:54 PM, Andrew Morton wrote:
> On Fri, 27 Feb 2015 15:52:56 -0800 Danesh Petigara <dpetigara@...adcom.com> wrote:
> 
>> On 2/27/2015 1:24 PM, Andrew Morton wrote:
>>> On Tue, 24 Feb 2015 15:39:45 -0800 Danesh Petigara <dpetigara@...adcom.com> wrote:
>>>
>>>> The CMA aligned offset calculation is incorrect for
>>>> non-zero order_per_bit values.
>>>>
>>>> For example, if cma->order_per_bit=1, cma->base_pfn=
>>>> 0x2f800000 and align_order=12, the function returns
>>>> a value of 0x17c00 instead of 0x400.
>>>>
>>>> This patch fixes the CMA aligned offset calculation.
>>>
>>> When fixing a bug please always describe the end-user visible effects
>>> of that bug.
>>>
>>> Without that information others are unable to understand why you are
>>> recommending a -stable backport.
>>>
>>
>> Thank you for the feedback. I had no crash logs to show, nevertheless, I
>> agree that a sentence describing potential effects of the bug would've
>> helped.
> 
> What was the reason for adding a cc:stable?
> 

It was added since the commit that introduced the incorrect logic
(b5be83e) was already picked up by v3.19.

Thanks,
Danesh
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