linux-kernel - Re: [PATCH 3/3] dma-pool: limit DMA and DMA32 zone size pools

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Message-ID: <20220822122759.GA14932@lst.de>
Date:   Mon, 22 Aug 2022 14:27:59 +0200
From:   Christoph Hellwig <hch@....de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Christoph Hellwig <hch@....de>, iommu@...ts.linux.dev,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] dma-pool: limit DMA and DMA32 zone size pools

On Mon, Aug 22, 2022 at 02:09:13PM +0200, Michal Hocko wrote:
> OK, so you are worried about configurations that lack ZONE_DMA32 because
> that memory range is covered by ZONE_DMA? I thought though simply do not
> have CONFIG_ZONE_DMA32. Or am I wrong here?

Zones can disappear when they are empty.  Normally that affects
ZONE_NORMAL and ZONE_HIGHMEM, but it can also happen to ZONE_DMA32
when there is not enough memory.