linux-kernel - Re: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn

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Message-ID: <bca59694-6b09-4839-8577-c8ac4420eb56@kernel.org>
Date: Mon, 19 Jan 2026 15:26:57 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Mostafa Saleh <smostafa@...gle.com>, linux-mm@...ck.org,
 iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Cc: 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
Subject: Re: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage

On 1/19/26 15:22, Mostafa Saleh wrote:
> This is a small fix for the new config IOMMU_DEBUG_PAGEALLOC based
> on the discussion:
> https://lore.kernel.org/linux-iommu/CAFgf54pBAUm3ao-UJksiuGKtvv4wzRyFq_uKwLe0H1ettO4DLQ@mail.gmail.com/
> 
> Where it was concluded that pfn_valid() is not enough to validate
> physical addresses before access to page_ext.
> 
> The first patch introduces a new function in page_ext that takes a
> physical address as an argument, and the second patch uses it instead
> of calling pfn_valid() and phys_to_page()
> 
> Benchmarks with the new implementation can be found in:
> https://lore.kernel.org/linux-iommu/20260114164322.787125-1-smostafa@google.com/
> 
> This series applies to iommu/core tree.

This is part of v7 [1], right? Can't we just apply v7 instead or are the 
commit IDs already stable?

[1] https://lkml.kernel.org/r/20260114164322.787125-1-smostafa@google.com

-- 
Cheers

David