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From: Muchun Song <muchun.song@linux.dev>
To: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	Barry Song <baohua@kernel.org>, Dev Jain <dev.jain@arm.com>,
	Hugh Dickins <hughd@google.com>, Jann Horn <jannh@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	John Hubbard <jhubbard@nvidia.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Lance Yang <lance.yang@linux.dev>,
	"Liam R. Howlett" <liam@infradead.org>,
	Lorenzo Stoakes <ljs@kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Michal Hocko <mhocko@suse.com>, Nico Pache <nico.pache@linux.dev>,
	Oscar Salvador <osalvador@suse.de>,
	Pedro Falcato <pfalcato@suse.de>, Peter Xu <peterx@redhat.com>,
	Ryan Roberts <ryan.roberts@arm.com>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Usama Arif <usama.arif@linux.dev>,
	Vlastimil Babka <vbabka@kernel.org>, Zi Yan <ziy@nvidia.com>,
	linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] userfaultfd: decouple fault reason from VMA flags
Date: Mon, 24 Aug 2026 16:12:41 +0800	[thread overview]
Message-ID: <CB35D894-1B3B-4D48-BCEF-38BB091F65FF@linux.dev> (raw)
In-Reply-To: <20260823-uffd-vm-flags-v1-v1-5-3086981b33cf@kernel.org>



> On Aug 23, 2026, at 20:17, Mike Rapoport (Microsoft) <rppt@kernel.org> wrote:
> 
> Introduce enum uffd_reason to define reasons for user faults rather than
> overload VM_UFFD_* VMA flags for that.
> 
> Using a dedicated enum makes the code clearer and decoupling the fault
> reason from VMA flags clears the way for moving the uffd mode bits out
> of VMA namespace.
> 
> No functional change.
> 
> Assisted-by: copilot:claude-opus-4.6
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Acked-by: Muchun Song <muchun.song@linux.dev> # for HugeTLB.

Thanks.


  reply	other threads:[~2026-08-24  8:13 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-23 12:17 [PATCH 0/6] userfaultfd: decouple uffd mode from VMA flags Mike Rapoport (Microsoft)
2026-08-23 12:17 ` [PATCH 1/6] mm/gup: move gup_can_follow_protnone() to gup.c Mike Rapoport (Microsoft)
2026-08-23 21:03   ` Barry Song
2026-08-24 14:42   ` David Hildenbrand (Arm)
2026-08-25 10:10     ` Mike Rapoport
2026-08-24 14:59   ` Lorenzo Stoakes (ARM)
2026-08-25  2:03   ` Zi Yan
2026-08-23 12:17 ` [PATCH 2/6] userfaultfd: constify VMA parameter of userfaultfd_*() helpers Mike Rapoport (Microsoft)
2026-08-23 12:27   ` sashiko-bot
2026-08-23 21:03   ` Barry Song
2026-08-24 15:03   ` Lorenzo Stoakes (ARM)
2026-08-25  2:03   ` Zi Yan
2026-08-23 12:17 ` [PATCH 3/6] userfaultfd: use userfaultfd_*() helpers instead of open coded flag tests Mike Rapoport (Microsoft)
2026-08-23 21:14   ` Barry Song
2026-08-24 15:10   ` Lorenzo Stoakes (ARM)
2026-08-25 11:19     ` Mike Rapoport
2026-08-25 11:26       ` Lorenzo Stoakes (ARM)
2026-08-27  7:14         ` Mike Rapoport
2026-08-23 12:17 ` [PATCH 4/6] userfaultfd: rename vm_userfaultfd_ctx to vm_uffd_state Mike Rapoport (Microsoft)
2026-08-24 14:43   ` David Hildenbrand (Arm)
2026-08-24 15:42   ` Lorenzo Stoakes (ARM)
2026-08-23 12:17 ` [PATCH 5/6] userfaultfd: decouple fault reason from VMA flags Mike Rapoport (Microsoft)
2026-08-24  8:12   ` Muchun Song [this message]
2026-08-24 14:46   ` David Hildenbrand (Arm)
2026-08-27  7:49     ` Mike Rapoport
2026-08-27  8:10       ` David Hildenbrand (Arm)
2026-08-27  9:09         ` Mike Rapoport
2026-08-27  9:19           ` David Hildenbrand (Arm)
2026-08-27  9:21             ` Lorenzo Stoakes (ARM)
2026-08-24 16:28   ` Lorenzo Stoakes (ARM)
2026-08-25 10:37     ` Mike Rapoport
2026-08-25 11:08       ` David Hildenbrand (Arm)
2026-08-25 11:38         ` Lorenzo Stoakes (ARM)
2026-08-25 13:00       ` Lorenzo Stoakes (ARM)
2026-08-27  7:42         ` Mike Rapoport
2026-08-27 11:29           ` Lorenzo Stoakes (ARM)
2026-08-23 12:17 ` [PATCH 6/6] userfaultfd: collapse VM_UFFD_{MISSING,WP,MINOR,RWP} into single VM_UFFD Mike Rapoport (Microsoft)
2026-08-24  7:11   ` Lance Yang
2026-08-24  8:17     ` Mike Rapoport
2026-08-24  8:27       ` Lance Yang
2026-08-25 12:44   ` Lorenzo Stoakes (ARM)
2026-08-25 12:45     ` Lorenzo Stoakes (ARM)
2026-08-27  9:03     ` Mike Rapoport
2026-08-27 11:16       ` Lorenzo Stoakes (ARM)
2026-08-27 11:18         ` Lorenzo Stoakes (ARM)
2026-08-27 15:19           ` David Hildenbrand (Arm)
2026-08-29 11:00             ` Mike Rapoport
2026-08-29 18:42               ` Tal Zussman
2026-08-30  5:36                 ` Mike Rapoport

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