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b=TsbMkB0/I4ehqS9VvETUbluDIw/2VgyRpwEWjyWVu4AV+5z7sCMJM5Hif4PlE5yp8 af88wp3NQtj+0hCWZpetaALNQPlR6Gt4eAPjFvl8L70UwFH3HjnDr3eaQKS3+vcLw0 wmRiPd/QTc4zB7EdbxWPSToBwH2L/jwaxklY8sfycXb4W3Fz02ESbZVGMhYaQUoH/y hA1+4z/Pg1rBV/IT8oZCm1Y0RkfGIpj/A2Y6+X7YfCGGmi50YFMl+cbEumexKpf3kX 5LYgXxkaEqIwqilSaRnp9XmlsQQjaF+0pm8HO6Hzm2640LZUqw334aUwFYNXTX/YDp R7Q61vaAQ+3aA== 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 5.15-stable tree Date: Sat, 28 Feb 2026 20:51:19 -0500 Message-ID: <20260301015119.1717595-1-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-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E7BA340007 X-Stat-Signature: dqdp45abastrkphr89194uneorqkt78b X-HE-Tag: 1772329882-89986 X-HE-Meta: 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 ksDCf7jb ABsqLQkD5gecnXD6Tbnz194H2YCSL1Adf9XIQaIowlKQal0IfcPpndqVPSAC5YklPHUJciYtPbXYdFR8XwO2a3g45ak8YFmIaa9n74XTu3RJMTZJ7J2gy5Az4NYewK//BmXAg1R12HUk2lhiWy4mmusVX/vOt/6wumJiCRMEA4Wn+daJE3yGE1lzjqJhGY9bgELw8oqyYr2OQufI1BFmSYcmqCl7yQZvR6Ct1rPWRjpHfAfyf4+Wce7vwKjnBwfb7FwCrX5waXR3/5QNY8kom/fubjBrgCmNOXah66zoEyaXvjoOIMZ92AhtejC5lM+qwutSmf55Uz4OVz9XCZE3HZBa9UEada/S3zXXcuxhQCe/5Kuc= 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 5.15-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