It can be useful to query how many bits are set in a cpumask. For
example, if you want to perform special logic for the last remaining
core that's set in a mask. This logic is already exposed through the
main kernel's cpumask header as cpumask_weight(), so it would be useful
to add a new bpf_cpumask_weight() kfunc which wraps it and does the
same.
This patch series was built and tested on top of commit 2146f7fe6e02
("Merge branch 'allocate-bpf-trampoline-on-bpf_prog_pack'").
David Vernet (2):
bpf: Add bpf_cpumask_weight() kfunc
selftests/bpf: Add test for bpf_cpumask_weight() kfunc
Documentation/bpf/cpumasks.rst | 2 +-
kernel/bpf/cpumask.c | 12 ++++++
.../selftests/bpf/prog_tests/cpumask.c | 1 +
.../selftests/bpf/progs/cpumask_common.h | 1 +
.../selftests/bpf/progs/cpumask_success.c | 43 +++++++++++++++++++
5 files changed, 58 insertions(+), 1 deletion(-)
--
2.42.1
