linux-kernel - Re: [PATCH] dma/pool: do not complain if DMA pool is not allocated

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Date:   Thu, 11 Aug 2022 09:43:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Baoquan He <bhe@...hat.com>, Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Donnelly <john.p.donnelly@...cle.com>,
        David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma/pool: do not complain if DMA pool is not allocated

On Wed, Aug 03, 2022 at 05:44:16PM +0200, Michal Hocko wrote:
> Unfortunately generic kernels cannot really know there is any
> crippled device without some code to some checking early boot (and I am
> not even sure this would be sufficient).

But we can know if we need the pool, which is only when AMD SEV is
enabled.  So we could add a check and skip allocating all the pools
including the GFP_DMA32 and GFP_KERNEL ones.  I can look into that.