Re: [PATCH v5 1/2] selftests: run tests on nommu architecture

["David Hildenbrand (Arm)" <david@kernel.org>]

On 10/6/26 10:56, Hajime Tazaki wrote:
> Architectures lacking MMU don't support fork(2) syscall and only
> vfork(2) is available with limitations.  Thus, we cannot run kselftest
> on nommu architecture as is.
> 
> This commit addresses this issue with the following changes:
> 
> - Detect NOMMU at runtime from the MmapCopy field in /proc/meminfo
>   and avoid timeout, which requires fork(2).
> - Document how to build and run the NOMMU tests, including the procfs
>   prerequisite for runtime detection.
> 
> Build and run the tests with:
> 
>  $ make ARCH=um O=build kselftest-all TARGETS=nommu
>  $ make ARCH=um O=build kselftest-install TARGETS=nommu
>  $ ./build/kselftest/kselftest_install/run_kselftest.sh -p -c nommu
> 
> Cc: Shuah Khan <shuah@kernel.org>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Kees Cook <kees@kernel.org>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Will Drewry <wad@chromium.org>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Brendan Jackman <brendan.jackman@linux.dev>
> Cc: Hangbin Liu <liuhangbin@gmail.com>
> Cc: "Ricardo B. Marliere" <rbm@suse.com>
> Cc: linux-kselftest@vger.kernel.org
> Cc: linux-um@lists.infradead.org
> Cc: linux-mm@kvack.org
> Cc: linux-doc@vger.kernel.org
> Closes: https://sashiko.dev/#/patchset/20260813063401.1786548-1-thehajime%40gmail.com
> Signed-off-by: Hajime Tazaki <thehajime@gmail.com>
> 

Acked-by: David Hildenbrand (Arm) <david@kernel.org>

-- 
Cheers,

David