Some BPF programs like scx schedulers have their own internal CPU mask types, mask types, which they must transform into struct bpf_cpumask instances before passing them to scheduling-related kfuncs. There is currently no way to efficiently populate the bitfield of a bpf_cpumask from BPF memory, and programs must use multiple bpf_cpumask_[set, clear] calls to do so. Introduce a kfunc helper to populate the bitfield of a bpf_cpumask from valid BPF memory with a single call. Changelog : ----------- v4->v5 v4: https://lore.kernel.org/bpf/20250305211235.368399-1-emil@xxxxxxxxxxxxxxx/ Addressed feedback by Hou Tao: * Readded the tests in tools/selftests/bpf/prog_tests/cpumask.c, turns out the selftest entries were not duplicates. * Removed stray whitespace in selftest. * Add patch the missing selftest to prog_tests/cpumask.c * Explicitly annotate all cpumask selftests with __success The last patch could very well be its own cleanup patch, but I rolled it into this series because it came up in the discussion. If the last patch in the series has any issues I'd be fine with applying the first 3 patches and dealing with it separately. v3->v4 v3: https://lore.kernel.org/bpf/20250305161327.203396-1-emil@xxxxxxxxxxxxxxx/ * Removed new tests from tools/selftests/bpf/prog_tests/cpumask.c because they were being run twice. Addressed feedback by Alexei Starovoitov: * Added missing return value in function kdoc * Added an additional patch fixing some missing kdoc fields in kernel/bpf/cpumask.c Addressed feedback by Tejun Heo: * Renamed the kfunc to bpf_cpumask_populate to avoid confusion w/ bitmap_fill() v2->v3 v2: https://lore.kernel.org/bpf/20250305021020.1004858-1-emil@xxxxxxxxxxxxxxx/ Addressed feedback by Alexei Starovoitov: * Added back patch descriptions dropped from v1->v2 * Elide the alignment check for archs with efficient unaligned accesses v1->v2 v1: https://lore.kernel.org/bpf/20250228003321.1409285-1-emil@xxxxxxxxxxxxxxx/ Addressed feedback by Hou Tao: * Add check that the input buffer is aligned to sizeof(long) * Adjust input buffer size check to use bitmap_size() * Add selftest for checking the bit pattern of the bpf_cpumask * Moved all selftests into existing files Signed-off-by: Emil Tsalapatis (Meta) <emil@xxxxxxxxxxxxxxx> Emil Tsalapatis (4): bpf: add kfunc for populating cpumask bits selftests: bpf: add bpf_cpumask_fill selftests bpf: fix missing kdoc string fields in cpumask.c selftests: bpf: add missing cpumask test to runner and annotate existing tests kernel/bpf/cpumask.c | 53 +++++++ .../selftests/bpf/prog_tests/cpumask.c | 4 + .../selftests/bpf/progs/cpumask_common.h | 1 + .../selftests/bpf/progs/cpumask_failure.c | 38 +++++ .../selftests/bpf/progs/cpumask_success.c | 131 ++++++++++++++++++ 5 files changed, 227 insertions(+) -- 2.47.1
