linux-kernel - Re: [PATCH] ARM: dma-mapping: always clear allocated buffers

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Message-ID: <0414bb3e-33a2-8f30-f765-ee10ecb44fad@huawei.com>
Date:   Wed, 25 Jul 2018 10:24:07 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     <linux@...linux.org.uk>, <matthias.bgg@...il.com>,
        <vladimir.murzin@....com>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <akpm@...ux-foundation.org>, <iamjoonsoo.kim@....com>,
        <robin.murphy@....com>, <treding@...dia.com>,
        <zhongjiang@...wei.com>
Subject: Re: [PATCH] ARM: dma-mapping: always clear allocated buffers

On 2018/7/25 2:09, Christoph Hellwig wrote:
> On Tue, Jul 24, 2018 at 10:04:35PM +0800, YueHaibing wrote:
>> Sean Wang report dma_zalloc_coherent doesn't work as expect on his
>> armv7,the allocated mem is not zeroed.The reason is __alloc_from_pool
>> doesn't honor __GFP_ZERO.
> 
> Please explain the "why" a little more.  All the explanations are in
> the referenced arm64 commit and should be mentioned here as well.

ok, will send v2.

> 
> .
>