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Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Aishwarya TCV , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests/mm: Specify requirement for PROC_MEM_ALWAYS_FORCE=y Message-ID: References: <20260416-selftests-mm-proc-mem-always-force-v1-1-3f5865153c67@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260416-selftests-mm-proc-mem-always-force-v1-1-3f5865153c67@kernel.org> X-Stat-Signature: mrz3d5coyp8ui57of5o1cd8rmyidzktw X-Rspamd-Queue-Id: A6EA61A0004 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1776365785-337052 X-HE-Meta: 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 ++P8z7wu 4ooUobu0yKsCEMzBOqaai+kZ+2jKE0THLkmwQYnFjl8QxiRdf99K0tIlLwOsV/7GNu/vE44zIOAQh49vZ/b3BATBB6iyojaleRqci4HbXDBqcaaau7qXRQUMo3DBA4gBY5daDKB14mFMvC+tsE4g/uOitNcaDrHaDn/79n2iO8y5bcwR/vsnwdRWSUzuuym0W1Bf3jwBUp2/u+r8p7UlridWPeGGAQhIgTtdwJVGtzHw5lu9+ixOHSd/pvaOSYKXWLSlqeSO1vJpKRJR3aK5qqnxu3VG0zgp+duFavspTe67xGg+lN97qHY3IEh7Z67+8d8OASiVKazKZHCA9iOzi6PvmUf3I+Yqv9RXPc89fdeTkIUyFGqyBGLfwtkneUw6uOR5I Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 > Signed-off-by: Mark Brown Reviewed-by: Mike Rapoport (Microsoft) > --- > 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 > -- Sincerely yours, Mike.