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b=ZHCLLI/ULZkUg//ReNcdrbKh9ukp3bUwp/D81avU9m/fjQRr0n3A19N1FJYM85bbS VD65DZAv+Ixahs1QGLJuYpllmpns6isegyhsFsUGastD8sfW0t3nZqtXINk6igGAe5 c/x1NUzBVl88U0pJr5ClX4p5PQRinlBP+JByod5Oe4H+Fywhtq3cuaxRcjNPKIxfgv djhQR82KNf4C04WORWX0LfDpZ7xG33qD+ws8+SiaDgKaFH2icNlBvjXQmMFs0UQadQ o25KisOVUl6ljv+VEBV37BOkMlouIoPp+BmLXJyTiho8P4tXBmN6Qvuwc21Dm+z02b yE1i8vyt8tnoQ== From: Sasha Levin To: stable@vger.kernel.org, liwang@redhat.com Cc: "David Hildenbrand (Red Hat)" , Waiman Long , Mark Brown , Shuah Khan , Andrew Morton , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: FAILED: Patch "selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs" failed to apply to 6.1-stable tree Date: Sat, 28 Feb 2026 20:42:49 -0500 Message-ID: <20260301014249.1704776-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 06C648000B X-Stat-Signature: 44owx5b9qbfinramdw5d3wk54px4cums X-Rspam-User: X-HE-Tag: 1772329372-36728 X-HE-Meta: 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 yzs1oC1v qCU489YSOro8Nqunb1jxjwKocuRwtLrlsJLg4gFRLoXWjzv6+0Tm3Gz43Xlpm4p+bIOW81LDjxcztNDbnNZV7wRCO7axiC+LgFcJnj1ZOpNsG92hgy34oBBNEO7HR8JWTeks4nuzqOHBZ2Kl1QWvizXwcVusdfdfOcQn626GJk9TYIg0Igl1U+0oOzeZR1whrGPKjLxeH6CrR0jDGq5nMr7T8gWBsoTSLVYl3WsGSPDZJIbc7Run4NC6aUR8k7neRuUDXr3vjDp8XISUeQ/p0tj+oonZic8mMlI6zud7QQD3BhbbyypS531qXeh8KafZfKwj1l6dDPGO3FSk/gX80sTx4BMgnvpMks+11xcoN6XIKtgs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 1aa1dd9cc595917882fb6db67725442956f79607 Mon Sep 17 00:00:00 2001 From: Li Wang Date: Sun, 21 Dec 2025 20:26:38 +0800 Subject: [PATCH] selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs charge_reserved_hugetlb.sh mounts a hugetlbfs instance at /mnt/huge with a fixed size of 256M. On systems with large base hugepages (e.g. 512MB), this is smaller than a single hugepage, so the hugetlbfs mount ends up with zero capacity (often visible as size=0 in mount output). As a result, write_to_hugetlbfs fails with ENOMEM and the test can hang waiting for progress. === Error log === # uname -r 6.12.0-xxx.el10.aarch64+64k #./charge_reserved_hugetlb.sh -cgroup-v2 # ----------------------------------------- ... # nr hugepages = 10 # writing cgroup limit: 5368709120 # writing reseravation limit: 5368709120 ... # write_to_hugetlbfs: Error mapping the file: Cannot allocate memory # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 ... # mount |grep /mnt/huge none on /mnt/huge type hugetlbfs (rw,relatime,seclabel,pagesize=512M,size=0) # grep -i huge /proc/meminfo ... HugePages_Total: 10 HugePages_Free: 10 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 524288 kB Hugetlb: 5242880 kB Drop the mount args with 'size=256M', so the filesystem capacity is sufficient regardless of HugeTLB page size. Link: https://lkml.kernel.org/r/20251221122639.3168038-3-liwang@redhat.com Fixes: 29750f71a9b4 ("hugetlb_cgroup: add hugetlb_cgroup reservation tests") Signed-off-by: Li Wang Acked-by: David Hildenbrand (Red Hat) Acked-by: Waiman Long Cc: Mark Brown Cc: Shuah Khan Cc: Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh index e1fe16bcbbe88..fa6713892d82d 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -290,7 +290,7 @@ function run_test() { setup_cgroup "hugetlb_cgroup_test" "$cgroup_limit" "$reservation_limit" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test" "$size" "$populate" \ "$write" "/mnt/huge/test" "$method" "$private" "$expect_failure" \ @@ -344,7 +344,7 @@ function run_multiple_cgroup_test() { setup_cgroup "hugetlb_cgroup_test2" "$cgroup_limit2" "$reservation_limit2" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test1" "$size1" \ "$populate1" "$write1" "/mnt/huge/test1" "$method" "$private" \ -- 2.51.0