linux-kernel - Re: [PATCH] mm: export cma alloc and release

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 7 Oct 2019 18:53:15 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mark Salyzyn <salyzyn@...roid.com>
Cc:     Christoph Hellwig <hch@....de>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yue Hu <huyue2@...ong.com>, Mike Rapoport <rppt@...ux.ibm.com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ryohei Suzuki <ryh.szk.cmnty@...il.com>,
        Doug Berger <opendmb@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Peng Fan <peng.fan@....com>, linux-mm@...ck.org,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH] mm: export cma alloc and release

On Mon, Oct 07, 2019 at 09:50:31AM -0700, Mark Salyzyn wrote:
> On 10/5/19 1:37 AM, Christoph Hellwig wrote:
>> On Thu, Oct 03, 2019 at 09:55:28AM +0100, Catalin Marinas wrote:
>>> Aren't drivers supposed to use the DMA API for such allocations rather
>>> than invoking cma_*() directly?
>> Yes, they are.
>
> We have an engineer assigned to rewriting the ion memory driver to use 
> dma_buf interfaces. Hopefully that effort will solve the problem of 
> requiring these interfaces to be exported so that that driver (and others) 
> can be modularized.
>
> Thanks for the reviews, drop this patch from the list and we will regroup, 
> and accept that standing code in the kernel can not be modularized for the 
> moment.

How is that different from the "DMA-BUF Heaps (destaging ION)" series
floating around?