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 v2 6/6] tools/testing/selftests/mm: add MAP_PRIVATE-/dev/zero merge tests
Date: Tue, 8 Sep 2026 14:50:20 +0200 [thread overview]
Message-ID: <dccc8e21-ade5-4726-ae17-a7017f084a02@kernel.org> (raw)
In-Reply-To: <20260908-map-private-dev-zero-v2-6-acc7b5625305@kernel.org>
On 9/8/26 13:23, Lorenzo Stoakes (ARM) wrote:
> Assert that MAP_PRIVATE-mapped /dev/zero mappings behave like they are
> anonymous.
>
> Test both unfaulted and faulted/unfaulted merges with page offset 0 which
> would not merge if the mappings were treated as if they were file-backed.
>
> With the recent change that makes them behave as pure anonymous mappings,
> the merges should succeed as their page offsets are equal to their
> anonymous page offsets.
>
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> ---
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-09-08 12:50 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-08 11:23 [PATCH v2 0/6] mm: make MAP_PRIVATE-/dev/zero mappings truly anonymous Lorenzo Stoakes (ARM)
2026-09-08 11:23 ` [PATCH v2 1/6] mm: move drivers/char/mem.c to mm/char-mem.c Lorenzo Stoakes (ARM)
2026-09-08 11:23 ` [PATCH v2 2/6] mm: implement file_is_dev_zero() to uniquely identify /dev/zero Lorenzo Stoakes (ARM)
2026-09-08 11:23 ` [PATCH v2 3/6] mm/vma: only permit MAP_PRIVATE /dev/zero to be mapped anonymous Lorenzo Stoakes (ARM)
2026-09-08 12:49 ` David Hildenbrand (Arm)
2026-09-08 12:52 ` Lorenzo Stoakes (ARM)
2026-09-08 14:17 ` David Hildenbrand (Arm)
2026-09-08 11:23 ` [PATCH v2 4/6] mm/vma: make MAP_PRIVATE-mapped /dev/zero mappings truly anonymous Lorenzo Stoakes (ARM)
2026-09-08 12:53 ` David Hildenbrand (Arm)
2026-09-08 11:23 ` [PATCH v2 5/6] tools/testing/vma: add test to assert MAP_PRIVATE-/dev/zero is anon Lorenzo Stoakes (ARM)
2026-09-08 11:23 ` [PATCH v2 6/6] tools/testing/selftests/mm: add MAP_PRIVATE-/dev/zero merge tests Lorenzo Stoakes (ARM)
2026-09-08 12:50 ` David Hildenbrand (Arm) [this message]
2026-09-08 23:45 ` [PATCH v2 0/6] mm: make MAP_PRIVATE-/dev/zero mappings truly anonymous Andrew Morton
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