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| author | Andrii Nakryiko <[email protected]> | 2024-02-06 00:40:08 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <[email protected]> | 2024-02-06 04:02:38 +0000 |
| commit | c7dcb6c9aa85fa310251dad7e233eb955a5235ed (patch) | |
| tree | 1b1f362cb3489569fd473d0fda11c678c016df7c /tools/lib/bpf/netlink.c | |
| parent | libbpf: fix return value for PERF_EVENT __arg_ctx type fix up check (diff) | |
| download | kernel-c7dcb6c9aa85fa310251dad7e233eb955a5235ed.tar.gz kernel-c7dcb6c9aa85fa310251dad7e233eb955a5235ed.zip | |
selftests/bpf: mark dynptr kfuncs __weak to make them optional on old kernels
Mark dynptr kfuncs as __weak to allow
verifier_global_subprogs/arg_ctx_{perf,kprobe,raw_tp} subtests to be
loadable on old kernels. Because bpf_dynptr_from_xdp() kfunc is used
from arg_tag_dynptr BPF program in progs/verifier_global_subprogs.c
*and* is not marked as __weak, loading any subtest from
verifier_global_subprogs fails on old kernels that don't have
bpf_dynptr_from_xdp() kfunc defined. Even if arg_tag_dynptr program
itself is not loaded, libbpf bails out on non-weak reference to
bpf_dynptr_from_xdp (that can't be resolved), which shared across all
programs in progs/verifier_global_subprogs.c.
So mark all dynptr-related kfuncs as __weak to unblock libbpf CI ([0]).
In the upcoming "kfunc in vmlinux.h" work we should make sure that
kfuncs are always declared __weak as well.
[0] https://github.com/libbpf/libbpf/actions/runs/7792673215/job/21251250831?pr=776#step:4:7961
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>
Diffstat (limited to 'tools/lib/bpf/netlink.c')
0 files changed, 0 insertions, 0 deletions