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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, muchun.song@linux.dev Subject: Re: [PATCH] selftests/mm: remove obsolete hugetlb vmemmap test Date: Fri, 10 Jul 2026 17:32:14 -0700 Message-ID: <20260711003215.32222-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260710092427.3459121-1-songmuchun@bytedance.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: wgmepk4t78d8s9zqdxh3ow3bgs6p9zbq X-Rspamd-Queue-Id: 33B4B20002 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1783729947-326487 X-HE-Meta: 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 KCgq13wU SYtDtKCz93pTFOOf50iaJoY/wZcblFDpTIgamzWGs25nrh87K9ROoreeaEetxJpffIAfG4fuQ/Io4ySYQppfyDERZ+qGHNcW1bAr/DzO9Z3H7gZn+GpNZtSDyGaQHZ7KBa4hB3jFo2XPRoVAAyak+BmrV7j0HNYr1n+lfruwOzWcDr/Jj0FqX9mmvspJ/U6T8PYk84evTcY7yLMRI/fdGdMBpXiilRIf2AiP6LWRm8f2n4O11g7Qp5c7LIHtbAXyi22wKMc36oIFoaNmLN5Hz6PnOPQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 10 Jul 2026 17:24:27 +0800 Muchun Song wrote: > The hugetlb vmemmap selftest was added to check the old HVO > layout where tail vmemmap pages reused the head page. That > assumption no longer matches the current HVO mapping layout. > > HVO now keeps a private backing page for the head vmemmap page > and remaps redundant tail vmemmap pages to a shared read-only > backing page. The old page flag check is therefore testing an > obsolete implementation detail rather than the current ABI or > behavior. > > Remove the stale test and its build, run, and ignore entries. Nice! > > Signed-off-by: Muchun Song Reviewed-by: SJ Park > --- > tools/testing/selftests/mm/.gitignore | 2 - > tools/testing/selftests/mm/Makefile | 1 - > tools/testing/selftests/mm/hugetlb-vmemmap.c | 132 ------------------- > tools/testing/selftests/mm/run_vmtests.sh | 1 - > 4 files changed, 136 deletions(-) > delete mode 100644 tools/testing/selftests/mm/hugetlb-vmemmap.c > > diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore > index 9ccd9e1447e6..227476d8ff1f 100644 > --- a/tools/testing/selftests/mm/.gitignore > +++ b/tools/testing/selftests/mm/.gitignore > @@ -3,11 +3,9 @@ cow > hugepage-mmap > hugepage-mremap > hugepage-shm > -hugepage-vmemmap > hugetlb-mmap > hugetlb-mremap > hugetlb-shm > -hugetlb-vmemmap > hugetlb-madvise > hugetlb-read-hwpoison > hugetlb-soft-offline I remember Linus argued [1] we shouldn't remove names from giignore. I don't really care, so feel free to add my R-b: tag. I just wanted to call out, though. [1] https://lore.kernel.org/all/CAHk-=whVY4mq1Fd=Vhwy0dK8fR5cOLkiy1OZMG4QyEMaGEd9ZQ@mail.gmail.com/ Thanks, SJ [...]