From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Muhammad Usama Anjum <usama.anjum@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Sarthak Sharma <sarthak.sharma@arm.com>
Subject: Re: [PATCH v3 1/5] selftests/mm: skip COW tmpfile cases when fallocate() is unsupported
Date: Thu, 13 Aug 2026 12:20:15 +0200 [thread overview]
Message-ID: <82530a53-b4c8-4671-b55a-c7ef95e06dda@kernel.org> (raw)
In-Reply-To: <20260727095225.372655-2-usama.anjum@arm.com>
On 7/27/26 11:52, Muhammad Usama Anjum wrote:
> The tmpfile-backed COW cases allocate a one-page file with fallocate()
> before exercising private and shared mappings. When the filesystem
> backing tmpfile() does not implement fallocate(), setup fails with
> EOPNOTSUPP and no COW behavior is exercised.
>
> This occurs when the temporary directory resides on a filesystem with
> limited allocation support, such as NFSv3. Reporting a failure adds
> noise because the test prerequisite is absent rather than the COW
> implementation being broken.
>
> Report EOPNOTSUPP as a skip. Continue treating every other fallocate()
> error as a failure so unexpected setup regressions remain visible.
>
> Tested-by: Sarthak Sharma <sarthak.sharma@arm.com>
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>
> ---
Worth a Fixes: ? I think so.
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-08-13 10:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-27 9:52 [PATCH v3 0/5] selftests/mm: Handle unsupported and transient test conditions Muhammad Usama Anjum
2026-07-27 9:52 ` [PATCH v3 1/5] selftests/mm: skip COW tmpfile cases when fallocate() is unsupported Muhammad Usama Anjum
2026-07-27 16:45 ` Usama Arif
2026-08-13 10:20 ` David Hildenbrand (Arm) [this message]
2026-08-13 10:43 ` Muhammad Usama Anjum
2026-07-27 9:52 ` [PATCH v3 2/5] selftests/mm: skip guard hole-punch test if MADV_REMOVE " Muhammad Usama Anjum
2026-07-27 16:52 ` Usama Arif
2026-08-13 10:21 ` David Hildenbrand (Arm)
2026-07-27 9:52 ` [PATCH v3 3/5] selftests/mm: skip khugepaged swap tests without swap Muhammad Usama Anjum
2026-07-27 17:18 ` Usama Arif
2026-07-29 9:18 ` Muhammad Usama Anjum
2026-08-13 10:26 ` David Hildenbrand (Arm)
2026-07-27 9:52 ` [PATCH v3 4/5] selftests/mm: skip hard dirty page-cache test on NFS Muhammad Usama Anjum
2026-07-27 9:52 ` [PATCH v3 5/5] selftests/mm: retry migration failures for the full runtime Muhammad Usama Anjum
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