From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751517AbdIMVwy (ORCPT <rfc822;w@1wt.eu>);
        Wed, 13 Sep 2017 17:52:54 -0400
Received: from mail.linuxfoundation.org ([140.211.169.12]:47898 "EHLO
        mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751148AbdIMVwu (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 13 Sep 2017 17:52:50 -0400
Date: Wed, 13 Sep 2017 14:52:49 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Huacai Chen <chenhc@lemote.com>
Cc: Fuxin Zhang <zhangfx@lemote.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH V3 2/3] mm: dmapool: Align to ARCH_DMA_MINALIGN in
 non-coherent DMA mode
Message-Id: <20170913145249.f89678a57842da122aa062fd@linux-foundation.org>
In-Reply-To: <1505294451-21312-1-git-send-email-chenhc@lemote.com>
References: <1505294451-21312-1-git-send-email-chenhc@lemote.com>
X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, 13 Sep 2017 17:20:51 +0800 Huacai Chen <chenhc@lemote.com> wrote:

> In non-coherent DMA mode, kernel uses cache flushing operations to
> maintain I/O coherency, so the dmapool objects should be aligned to
> ARCH_DMA_MINALIGN.

What are the user-visible effects of this bug?