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.
Hechao Li (2):
bpf: add a new API libbpf_num_possible_cpus()
bpf: use libbpf_num_possible_cpus in bpftool and selftests
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_util.h | 37 +++--------------
5 files changed, 84 insertions(+), 80 deletions(-)
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2.17.1
