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Date:   Wed, 15 Dec 2021 08:27:44 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     john.p.donnelly@oracle.com
Cc:     Christoph Hellwig <hch@lst.de>, Baoquan He <bhe@redhat.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        akpm@linux-foundation.org, cl@linux.com, kexec@lists.infradead.org,
        stable@vger.kernel.org, Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v3 5/5] mm/slub: do not create dma-kmalloc if no
 managed pages in DMA zone
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References: <20211213122712.23805-1-bhe@redhat.com> <20211213122712.23805-6-bhe@redhat.com> <20211214163124.GA21762@lst.de> <dc648afe-6dbe-55c9-ebf6-9334d71706b4@oracle.com>
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On Tue, Dec 14, 2021 at 11:07:34AM -0600, john.p.donnelly@oracle.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.