Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752178AbbB1BHe (ORCPT ); Fri, 27 Feb 2015 20:07:34 -0500 Received: from mail-gw2-out.broadcom.com ([216.31.210.63]:56337 "EHLO mail-gw2-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751101AbbB1BHc (ORCPT ); Fri, 27 Feb 2015 20:07:32 -0500 X-IronPort-AV: E=Sophos;i="5.09,664,1418112000"; d="scan'208";a="58229288" Message-ID: <54F114D0.3060306@broadcom.com> Date: Fri, 27 Feb 2015 17:07:28 -0800 From: Danesh Petigara User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Andrew Morton CC: , , , , , , , , Subject: Re: [PATCH v2] mm: cma: fix CMA aligned offset calculation References: <1424821185-16956-1-git-send-email-dpetigara@broadcom.com> <20150227132443.e17d574d45451f10f413f065@linux-foundation.org> <54F10358.1050102@broadcom.com> <20150227155458.697b7701d0a67ff7b4f3d9cb@linux-foundation.org> In-Reply-To: <20150227155458.697b7701d0a67ff7b4f3d9cb@linux-foundation.org> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1385 Lines: 39 On 2/27/2015 3:54 PM, Andrew Morton wrote: > On Fri, 27 Feb 2015 15:52:56 -0800 Danesh Petigara wrote: > >> On 2/27/2015 1:24 PM, Andrew Morton wrote: >>> On Tue, 24 Feb 2015 15:39:45 -0800 Danesh Petigara 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/