linux-kernel - Re: [PATCH V15 1/6] mm: softdirty: Add pgtable_supports_soft

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Message-Id: <20251121103636.22321ceb37093370e59cb6e1@linux-foundation.org>
Date: Fri, 21 Nov 2025 10:36:36 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Chunyan Zhang <zhangchunyan@...as.ac.cn>, Paul Walmsley
 <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Alexander Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org, Peter Xu
 <peterx@...hat.com>, Arnd Bergmann <arnd@...db.de>, David Hildenbrand
 <david@...hat.com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>, Vlastimil
 Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan
 <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, Axel Rasmussen
 <axelrasmussen@...gle.com>, Yuanchu Xie <yuanchu@...gle.com>,
 linux-riscv@...ts.infradead.org, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, devicetree@...r.kernel.org, Conor Dooley
 <conor@...nel.org>, Deepak Gupta <debug@...osinc.com>, Ved Shanbhogue
 <ved@...osinc.com>, linux-fsdevel@...r.kernel.org, Christian Brauner
 <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 linux-kernel@...r.kernel.org, Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V15 1/6] mm: softdirty: Add
 pgtable_supports_soft_dirty()

On Fri, 21 Nov 2025 16:57:17 +0000 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:

> This breaks the VMA tests. Don't worry it's not exactly an obvious thing.
> 
> You can test this via:
> 
> $ cd tools/testing/vma
> $ make && ./vma
> 
> (Currently we also have another breakage too which I'll chase up separately.)
> 
> Andrew - Could we simply apply the attached fix-patch?
> 
> I know this is in mm-stable now so ugh maybe we'll have some commits where VMA
> tests are broken (not nice for bisection), but anyway we need to fix this even
> so even if it has to be a follow up patch.

"mm: softdirty: add pgtable_supports_soft_dirty()" is still in
mm-unstable so all is good.