linux-kernel - Re: [PATCH v1 ] ALSA: core: memalloc: add page alignment for iram

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Message-ID: <05c824e5-0c33-4182-26fa-b116a42b10d6@metafoo.de>
Date:   Thu, 17 Dec 2020 10:43:45 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Robin Gong <yibin.gong@....com>, perex@...ex.cz, tiwai@...e.com,
        akpm@...ux-foundation.org, xiang@...nel.org,
        pierre-louis.bossart@...ux.intel.com, gustavoars@...nel.org,
        shengjiu.wang@....com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 ] ALSA: core: memalloc: add page alignment for iram

On 12/17/20 5:15 PM, Robin Gong wrote:
> Since mmap for userspace is based on page alignment, add page alignment
> for iram alloc from pool, otherwise, some good data located in the same
> page of dmab->area maybe touched wrongly by userspace like pulseaudio.
>
I wonder, do we also have to align size to be a multiple of PAGE_SIZE to 
avoid leaking unrelated data?