On 13/08/2026 11:20 am, David Hildenbrand (Arm) wrote:
> 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 <[email protected]>
>> Signed-off-by: Muhammad Usama Anjum <[email protected]>
>> ---
>
> Worth a Fixes: ? I think so.
Thanks for reviewing!
Fixes: f8664f3c4a08 ("selftests/vm: cow: basic COW tests for non-anonymous
pages")
>
> Acked-by: David Hildenbrand (Arm) <[email protected]>
--
Thanks,
Usama
