linux-kernel - Re: [PATCH RESEND v2 2/5] dma-pool: allow user to disable atomic pool

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Message-ID: <20211213074404.GA20758@lst.de>
Date:   Mon, 13 Dec 2021 08:44:04 +0100
From:   Christoph Hellwig <hch@....de>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, hch@....de, robin.murphy@....com,
        cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, vbabka@...e.cz, m.szyprowski@...sung.com,
        John.p.donnelly@...cle.com, kexec@...ts.infradead.org
Subject: Re: [PATCH RESEND v2 2/5] dma-pool: allow user to disable atomic
 pool

On Tue, Dec 07, 2021 at 11:07:47AM +0800, Baoquan He wrote:
> In the current code, three atomic memory pools are always created,
> atomic_pool_kernel|dma|dma32, even though 'coherent_pool=0' is
> specified in kernel command line. In fact, atomic pool is only
> necessary when CONFIG_DMA_DIRECT_REMAP=y or mem_encrypt_active=y
> which are needed on few ARCHes.

And only these select the atomic pool, so it won't get created otherwise.
What problem are you trying to solve?