From: Andrew Morton <akpm@linux-foundation.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
Pedro Falcato <pfalcato@suse.de>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Lance Yang <lance.yang@linux.dev>,
syzbot+c181d3198e98f8aef8b9@syzkaller.appspotmail.com
Subject: Re: [PATCH] drivers/char/mem: mmap readonly MAP_SHARED-/dev/zero correctly
Date: Mon, 28 Sep 2026 17:26:54 -0700 [thread overview]
Message-ID: <20260928172654.7030810755eefd2a1503a0ee@linux-foundation.org> (raw)
In-Reply-To: <f78d2f52-1135-425c-a3e8-460a6e80e19b@kernel.org>
On Mon, 28 Sep 2026 13:59:47 +0200 "David Hildenbrand (Arm)" <david@kernel.org> wrote:
>
> >
> >>
> >> b) Do what Lorenzo proposes. This will allocate real memory. Someone decided to
> >> use MAP_SHARED, for unknown reasons, so I'd assume it's unlikely that
> >> something breaks, but you have a point.
> >
> > I would say this patch is the right fix for the moment to fix the assert, and we
> > can chase up with other approaches afterwards.
>
> It will get backported, so we better be careful.
I don't think it'll get backported. I hope not.
The Fixes: target of 93c0c8dc87f6 ("mm/rmap: use anon pgoff to track
MAP_PRIVATE file-backed anon folios") is new in v7.3-rc1, so this will
go in as a hotfix against this -rc cycle only.
next prev parent reply other threads:[~2026-09-29 0:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 14:48 [PATCH] drivers/char/mem: mmap readonly MAP_SHARED-/dev/zero correctly Lorenzo Stoakes (ARM)
2026-09-24 15:08 ` Greg Kroah-Hartman
2026-09-24 15:29 ` Lorenzo Stoakes (ARM)
2026-09-24 15:42 ` Greg Kroah-Hartman
2026-09-24 15:37 ` David Hildenbrand (Arm)
2026-09-25 2:58 ` Andrew Morton
2026-09-25 7:29 ` David Hildenbrand (Arm)
2026-09-25 8:38 ` Lorenzo Stoakes (ARM)
2026-09-28 11:59 ` David Hildenbrand (Arm)
2026-09-28 15:08 ` Lorenzo Stoakes (ARM)
2026-09-29 0:26 ` Andrew Morton [this message]
2026-09-29 6:14 ` David Hildenbrand (Arm)
2026-10-07 2:14 ` Lance Yang
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