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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Li Wang
ca9caa098f
Patch series "selftests/cgroup: Fix false positive failures in test_percpu_basic", v2. This patch series addresses two separate issues that cause false positive failures in the test_percpu_basic test within the cgroup kmem selftests. The first issue stems from a hardcoded assumption about the system page size, which breaks the test on architectures with larger page sizes. The second issue is an overly strict memory check that fails to account for the slab metadata allocated during cgroup creation. This patch (of 2): MAX_VMSTAT_ERROR uses a hardcoded page size of 4096, which assumes 4K pages. This causes test_percpu_basic to fail on systems where the kernel is configured with a larger page size, such as aarch64 systems using 16K or 64K pages, where the maximum permissible discrepancy between memory.current and percpu charges is proportionally larger. Replace the hardcoded 4096 with sysconf(_SC_PAGESIZE) to correctly derive the page size at runtime regardless of the underlying architecture or kernel configuration. Link: https://lore.kernel.org/20260501022058.18024-1-li.wang@linux.dev Link: https://lore.kernel.org/20260501022058.18024-2-li.wang@linux.dev Signed-off-by: Li Wang <li.wang@linux.dev> Acked-by: Waiman Long <longman@redhat.com> Reviewed-by: Sayali Patil <sayalip@linux.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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