Re: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage

Mostafa Saleh
2026-01-19T15:09:38Z

On Mon, Jan 19, 2026 at 2:27 PM David Hildenbrand (Red Hat)
<david@kernel.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