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

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Message-Id: <20150227132443.e17d574d45451f10f413f065@linux-foundation.org>
Date:	Fri, 27 Feb 2015 13:24:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Danesh Petigara <dpetigara@...adcom.com>
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 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.

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