linux-kernel - Re: [PATCH v5 0/3] mm: Implement ECC handling for pfn with no struct page

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Message-Id: <20251103184742.441e98e93c5ed36320c4f41a@linux-foundation.org>
Date: Mon, 3 Nov 2025 18:47:42 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: <ankita@...dia.com>
Cc: <aniketa@...dia.com>, <vsethi@...dia.com>, <jgg@...dia.com>,
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Subject: Re: [PATCH v5 0/3] mm: Implement ECC handling for pfn with no
 struct page

On Sun, 2 Nov 2025 18:44:31 +0000 <ankita@...dia.com> wrote:

> Poison (or ECC) errors can be very common on a large size cluster.
> The kernel MM currently handles ECC errors / poison only on memory page
> backed by struct page. The handling is currently missing for the PFNMAP
> memory that does not have struct pages. The series adds such support.
> 
> Implement a new ECC handling for memory without struct pages. Kernel MM
> expose registration APIs to allow modules that are managing the device
> to register its device memory region. MM then tracks such regions using
> interval tree.

Thanks.  My knowledge of this material is weaker than usual :( But the
series looks good to my eye so I'll toss it into mm.git's mm-new branch
for some testing exposure.  If that goes OK then I'll later move it
into the mm-unstable branch where it will get linux-next esposure.  At
that point I'll monitor reviewer and tester feedback (please).