From: Mostafa Saleh <smostafa@google.com>
To: linux-mm@kvack.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Cc: corbet@lwn.net, joro@8bytes.org, will@kernel.org,
robin.murphy@arm.com, akpm@linux-foundation.org, vbabka@suse.cz,
surenb@google.com, mhocko@suse.com, jackmanb@google.com,
hannes@cmpxchg.org, ziy@nvidia.com, david@redhat.com,
lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com,
rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com,
rdunlap@infradead.org, Mostafa Saleh <smostafa@google.com>
Subject: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage
Date: Mon, 19 Jan 2026 14:22:44 +0000 [thread overview]
Message-ID: <20260119142246.3821052-1-smostafa@google.com> (raw)
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.
Mostafa Saleh (2):
mm/page_ext: Add page_ext_get_phys()
iommu: debug-pagealloc: Use page_ext_get_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
next reply other threads:[~2026-01-19 14:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-19 14:22 Mostafa Saleh [this message]
2026-01-19 14:22 ` [PATCH 1/2] mm/page_ext: Add page_ext_get_phys() Mostafa Saleh
2026-01-19 15:48 ` Jörg Rödel
2026-01-19 15:55 ` Mostafa Saleh
2026-01-19 14:22 ` [PATCH 2/2] iommu: debug-pagealloc: Use page_ext_get_phys() Mostafa Saleh
2026-01-19 14:26 ` [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage David Hildenbrand (Red Hat)
2026-01-19 15:09 ` Mostafa Saleh
2026-01-19 15:16 ` David Hildenbrand (Red Hat)
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