From: "David Hildenbrand (Arm)" <david@kernel.org>
To: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.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>, Hugh Dickins <hughd@google.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Jan Kara <jack@suse.cz>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH 2/6] mm: implement file_is_dev_zero() to uniquely identify /dev/zero
Date: Mon, 7 Sep 2026 18:21:27 +0200 [thread overview]
Message-ID: <292b27a7-94d1-4a2e-8346-a53e80fd2ed0@kernel.org> (raw)
In-Reply-To: <20260902-map-private-dev-zero-v1-2-a578c730cec7@kernel.org>
On 9/2/26 20:00, Lorenzo Stoakes (ARM) wrote:
> To lay the foundation for a future change that converts
> MAP_PRIVATE-/dev/zero mappings to be truly anonymous, add the ability to
> uniquely identify these mappings.
>
> With the memory character device now part of mm/ this is trivially
> achievable through a file_is_dev_zero() predicate that simply tests that
> the file operation hooks are zero_fops.
>
> Also update userland VMA tests to expose file_is_dev_zero() and provide
> a stub zero_fops for testing.
>
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> ---
yes!
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-09-07 16:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 18:00 [PATCH 0/6] mm: make MAP_PRIVATE-/dev/zero mappings truly anonymous Lorenzo Stoakes (ARM)
2026-09-02 18:00 ` [PATCH 1/6] mm: move drivers/char/mem.c to mm/char-mem.c Lorenzo Stoakes (ARM)
2026-09-03 12:34 ` Mike Rapoport
2026-09-07 16:20 ` David Hildenbrand (Arm)
2026-09-02 18:00 ` [PATCH 2/6] mm: implement file_is_dev_zero() to uniquely identify /dev/zero Lorenzo Stoakes (ARM)
2026-09-07 16:21 ` David Hildenbrand (Arm) [this message]
2026-09-07 16:29 ` Lorenzo Stoakes (ARM)
2026-09-02 18:00 ` [PATCH 3/6] mm/vma: only permit MAP_PRIVATE /dev/zero to be mapped anonymous Lorenzo Stoakes (ARM)
2026-09-07 16:04 ` Gregory Price
2026-09-07 16:26 ` Lorenzo Stoakes (ARM)
2026-09-07 16:56 ` David Hildenbrand (Arm)
2026-09-07 17:38 ` Lorenzo Stoakes (ARM)
2026-09-07 19:54 ` David Hildenbrand (Arm)
2026-09-08 8:46 ` Lorenzo Stoakes (ARM)
2026-09-02 18:00 ` [PATCH 4/6] mm/vma: make MAP_PRIVATE-mapped /dev/zero mappings truly anonymous Lorenzo Stoakes (ARM)
2026-09-02 18:00 ` [PATCH 5/6] tools/testing/vma: add test to assert MAP_PRIVATE-/dev/zero is anon Lorenzo Stoakes (ARM)
2026-09-02 18:00 ` [PATCH 6/6] tools/testing/selftests/mm: add MAP_PRIVATE-/dev/zero merge tests Lorenzo Stoakes (ARM)
2026-09-07 17:08 ` David Hildenbrand (Arm)
2026-09-08 8:56 ` Lorenzo Stoakes (ARM)
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