Re: [PATCH] selftests/mm: Specify requirement for PROC_MEM_ALWAYS_FORCE=y

[Mike Rapoport <rppt@kernel.org>]

On Thu, Apr 16, 2026 at 07:40:56PM +0100, Mark Brown wrote:
> Several of the mm selftests made use of /proc/pid/mem as part of their
> operation but we do not specify this in the config fragment for them, at
> least mkdirty and ksm_functional_tests have this requirement.
> 
> This has been working fine in practice since PROC_MEM_ALWAYS_FORCE was the
> default setting but commit 599bbba5a36f ("proc: make PROC_MEM_FORCE_PTRACE
> the Kconfig default") that is no longer the case, meaning that tests run
> on kernels built based on defconfigs have started having the new more
> restrictive default and failing. Add PROC_MEM_ALWAYS_FORCE to the config
> fragment for the mm selftests.
> 
> Thanks to Aishwarya TCV for spotting the issue and identifying the commit
> that introduced it.
> 
> Reported-by: Aishwarya TCV <aishwarya.tcv@arm.com>
> Signed-off-by: Mark Brown <broonie@kernel.org>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

> ---
>  tools/testing/selftests/mm/config | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config
> index 1dbe2b4558ab..06f78bd232e2 100644
> --- a/tools/testing/selftests/mm/config
> +++ b/tools/testing/selftests/mm/config
> @@ -13,3 +13,4 @@ CONFIG_PROFILING=y
>  CONFIG_UPROBES=y
>  CONFIG_MEMORY_FAILURE=y
>  CONFIG_HWPOISON_INJECT=m
> +CONFIG_PROC_MEM_ALWAYS_FORCE=y
> 
> ---
> base-commit: 599bbba5a36f6de57ab14c373c25881e2b5273f5
> change-id: 20260416-selftests-mm-proc-mem-always-force-5ce1b26022c2
> 
> Best regards,
> --  
> Mark Brown <broonie@kernel.org>
> 

-- 
Sincerely yours,
Mike.