Getting number of possible CPUs is commonly used for per-CPU BPF maps
and perf_event_maps. Add a new API libbpf_num_possible_cpus() that
helps user with per-CPU related operations and remove duplicate
implementations in bpftool and selftests.
v2: Save errno before calling pr_warning in case it is changed.
v3: Make sure libbpf_num_possible_cpus never returns 0 so that user only
has to check if ret value < 0.
v4: Fix error code when reading 0 bytes from possible CPU file.
v5: Fix selftests compliation issue.
v6: Split commit to reuse libbpf_num_possible_cpus() into two commits:
One commit to remove bpf_util.h from test BPF C programs.
One commit to reuse libbpf_num_possible_cpus() in bpftools
and bpf_util.h.
Hechao Li (3):
bpf: add a new API libbpf_num_possible_cpus()
selftests/bpf: remove bpf_util.h from BPF C progs
bpf: use libbpf_num_possible_cpus internally
tools/bpf/bpftool/common.c | 53 ++---------------
tools/lib/bpf/libbpf.c | 57 +++++++++++++++++++
tools/lib/bpf/libbpf.h | 16 ++++++
tools/lib/bpf/libbpf.map | 1 +
tools/testing/selftests/bpf/bpf_endian.h | 1 +
tools/testing/selftests/bpf/bpf_util.h | 37 ++----------
.../selftests/bpf/progs/sockmap_parse_prog.c | 1 -
.../bpf/progs/sockmap_tcp_msg_prog.c | 2 +-
.../bpf/progs/sockmap_verdict_prog.c | 1 -
.../selftests/bpf/progs/test_sysctl_prog.c | 5 +-
10 files changed, 90 insertions(+), 84 deletions(-)
--
2.17.1
