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

[Christoph Hellwig]

On Mon, Aug 22, 2022 at 10:41:01AM +0200, Michal Hocko wrote:
> ZONE_DMA existance is not runtime controlable (at least on x86).

This is more about ZONE_DMA32 that can disappear if all memory is
inside ZONE_DMA.  That is highly unusual (but still possible) with a
tiny x86-style ZONE_DMA, but can happen with a larger one other
architectures.