linux-kernel - Re: [PATCH V12 2/5] mm: userfaultfd: Add pgtable_supports_uffd

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Message-ID: <20250915-borrower-crusher-7a9e9121a1b0@spud>
Date: Mon, 15 Sep 2025 18:05:28 +0100
From: Conor Dooley <conor@...nel.org>
To: Chunyan Zhang <zhangchunyan@...as.ac.cn>
Cc: linux-riscv@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Deepak Gupta <debug@...osinc.com>,
	Ved Shanbhogue <ved@...osinc.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Xu <peterx@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.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>,
	Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V12 2/5] mm: userfaultfd: Add pgtable_supports_uffd_wp()

On Mon, Sep 15, 2025 at 06:13:40PM +0800, Chunyan Zhang wrote:
> Some platforms can customize the PTE/PMD entry uffd-wp bit making
> it unavailable even if the architecture provides the resource.
> This patch adds a macro API that allows architectures to define their
> specific implementations to check if the uffd-wp bit is available
> on which device the kernel is running.
> 
> Signed-off-by: Chunyan Zhang <zhangchunyan@...as.ac.cn>

According to patchwork CI for riscv, this doesn't build for 32-bit
defconfigs or the no-mmu defconfigs.

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