linux-kernel - Re: [PATCH v5 4/9] PCI/P2PDMA: Export pci_p2pdma_map

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Message-ID: <aPHi2c2BQNB4eqm_@infradead.org>
Date: Thu, 16 Oct 2025 23:31:53 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Alex Williamson <alex.williamson@...hat.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org, iommu@...ts.linux.dev,
	Jens Axboe <axboe@...nel.dk>, Joerg Roedel <joro@...tes.org>,
	kvm@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linux-pci@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Will Deacon <will@...nel.org>
Subject: Re: [PATCH v5 4/9] PCI/P2PDMA: Export pci_p2pdma_map_type() function


Nacked-by: Christoph Hellwig <hch@....de>

As explained to you multiple times, pci_p2pdma_map_type is a low-level
helper that absolutely MUST be wrapper in proper accessors.  It is
dangerous when used incorrectly and requires too much boiler plate.
There is no way this can be directly exported, and you really need to
stop resending this.