linux-kernel - Re: [PATCH v6 3/4] iommu: debug-pagealloc: Track IOMMU pages

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Message-ID: <20260113150828.GP745888@ziepe.ca>
Date: Tue, 13 Jan 2026 11:08:28 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Mostafa Saleh <smostafa@...gle.com>
Cc: "David Hildenbrand (Red Hat)" <david@...nel.org>, linux-mm@...ck.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, corbet@....net, joro@...tes.org,
	will@...nel.org, robin.murphy@....com, akpm@...ux-foundation.org,
	vbabka@...e.cz, surenb@...gle.com, mhocko@...e.com,
	jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com,
	lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
	rppt@...nel.org, xiaqinxin@...wei.com, baolu.lu@...ux.intel.com,
	rdunlap@...radead.org, Samiullah Khawaja <skhawaja@...gle.com>
Subject: Re: [PATCH v6 3/4] iommu: debug-pagealloc: Track IOMMU pages

On Tue, Jan 13, 2026 at 10:49:28AM +0000, Mostafa Saleh wrote:
> Would you have a problem if we added a new function in page_ext
> "page_ext_from_phys()" as Jason suggested?

Given the hidden complexity that David just pointed out I think this
is essential to encapsulate it in a function.

The function must be able to accept any phys_addr_t and safely returns
NULL if page_ext cannot be used for some reason.

Jason