https://bugzilla.kernel.org/show_bug.cgi?id=219226 Bug ID: 219226 Summary: Invalid BPF_MAP_TYPE_PERCPU_ARRAY value size limits Product: Documentation Version: unspecified Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: man-pages Assignee: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx Reporter: kernel@dimka.rocks Regression: No Not a man page but I'm not sure where else to submit, it's part of the docs. In Documentation/bpf/map_array.rst in the end of the first paragraph > The value stored can be of any size, however, all array elements are aligned > to 8 bytes. should be changed to: > The value stored can be of any size for BPF_MAP_TYPE_ARRAY and not more than > PCPU_MIN_UNIT_SIZE (currently 32 kB) for BPF_MAP_TYPE_PERCPU_ARRAY. All array > elements are aligned to 8 bytes. The limitation is in linux/mm/percpu.c if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE || !is_power_of_2(align))) { WARN(do_warn, "illegal size (%zu) or align (%zu) for percpu allocation\n", size, align); return NULL; } PCPU_MIN_UNIT_SIZE defined in include/linux/percpu.h as "PFN_ALIGN(32 << 10)" -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
