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

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Message-ID: <CAFgf54paL1O22-crK-RufOzwYBqQ-CU4BD6=h30WOOfdA2__Vg@mail.gmail.com>
Date: Mon, 19 Jan 2026 15:09:21 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>
Cc: 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
Subject: Re: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage

On Mon, Jan 19, 2026 at 2:27 PM David Hildenbrand (Red Hat)
<david@...nel.org> wrote:
>
> 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?
>

It should be stable according to Will:
https://lore.kernel.org/linux-iommu/20260114164322.787125-1-smostafa@google.com/T/#m59d0b455e3f2160cb6f9980a0ae65bc481c53898

Thanks,
Mostafa

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