linux-kernel - Re: [PATCH v3 5/5] mm/slub: do not create dma-kmalloc if no managed pages in DMA zone

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Message-ID: <20211215072744.GB3010@lst.de>
Date:   Wed, 15 Dec 2021 08:27:44 +0100
From:   Christoph Hellwig <hch@....de>
To:     john.p.donnelly@...cle.com
Cc:     Christoph Hellwig <hch@....de>, Baoquan He <bhe@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, cl@...ux.com, kexec@...ts.infradead.org,
        stable@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH v3 5/5] mm/slub: do not create dma-kmalloc if no
 managed pages in DMA zone

On Tue, Dec 14, 2021 at 11:07:34AM -0600, john.p.donnelly@...cle.com wrote:
> Is CONFIG_ZONE_DMA even needed anymore in x86_64  ?

Yes.  There are still plenty of addressing challenged devices, mostly
ISA-like but also a few PCI/PCIe ones.