linux-kernel - [PATCH v2 0/2] iommu: debug-pagealloc: Remove pfn

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Message-ID: <20260120091926.670155-1-smostafa@google.com>
Date: Tue, 20 Jan 2026 09:19:24 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: 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, david@...hat.com, 
	lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, rppt@...nel.org, 
	xiaqinxin@...wei.com, baolu.lu@...ux.intel.com, rdunlap@...radead.org, 
	Mostafa Saleh <smostafa@...gle.com>
Subject: [PATCH v2 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage

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.

Changes on v2:
v1: https://lore.kernel.org/linux-iommu/20260119142246.3821052-1-smostafa@google.com/
- Rename page_ext_phys() to page_ext_from_phys()
- Reword comment and commit messages.

Mostafa Saleh (2):
  mm/page_ext: Add page_ext_get_from_phys()
  iommu: debug-pagealloc: Use page_ext_get_from_phys()

 drivers/iommu/iommu-debug-pagealloc.c | 31 ++++++++++++---------------
 include/linux/page_ext.h              |  6 ++++++
 mm/page_ext.c                         | 23 ++++++++++++++++++++
 3 files changed, 43 insertions(+), 17 deletions(-)

-- 
2.52.0.457.g6b5491de43-goog