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Date: Tue, 8 Sep 2026 21:18:59 -0500
From: Bjorn Helgaas <helgaas@kernel.org>
To: Leon Romanovsky <leon@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jens Axboe <axboe@kernel.dk>, Chaitanya Kulkarni <kch@nvidia.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Ankit Agrawal <ankita@nvidia.com>,
	Alex Williamson <alex@shazbot.org>, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org, Tushar Dave <tdave@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>
Subject: Re: [PATCH 5/5] PCI/P2PDMA: Gate the host bridge whitelist warning
 on verbose
Message-ID: <20260909021859.GA159841@bhelgaas>
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In-Reply-To: <20260830-batch-p2p-fixes-v1-5-5044e8dfbe2e@nvidia.com>

On Sun, Aug 30, 2026 at 02:16:23PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
> 
> calc_map_type_and_dist() prints every other diagnostic under its verbose
> argument, but reaches the "Host bridge not in P2PDMA whitelist" warning
> through host_bridge_whitelist(), which it hands acs_redirects instead.
> A caller that asked for a silent answer still gets the warning whenever
> any port on the path has an ACS redirect bit set, the CPU is not
> whitelisted by cpu_supports_p2pdma(), and the host bridge is not in
> pci_p2pdma_whitelist[].

Not in this series, but I would like to see the "whitelist" term
removed from drivers/pci.  p2pdma.c and pci-pf-stub.c are the only
current uses, and I don't think a change would cause any API issue.

There are similar "blacklist" uses in pci.c, aspm.c, and vpd.c.