[PATCH v2 bpf-next 0/4] bpf: Add detection of kfuncs.

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

From: Alexei Starovoitov <ast@xxxxxxxxxx>

Allow BPF programs detect at load time whether particular kfunc exists.

Patch 1: Allow ld_imm64 to point to kfunc in the kernel.
Patch 2: Fix relocation of kfunc in ld_imm64 insn when kfunc is in kernel module.
Patch 3: Introduce bpf_ksym_exists() macro.
Patch 4: selftest.

NOTE: detection of kfuncs from light skeleton is not supported yet.

Alexei Starovoitov (4):
  bpf: Allow ld_imm64 instruction to point to kfunc.
  libbpf: Fix relocation of kfunc ksym in ld_imm64 insn.
  libbpf: Introduce bpf_ksym_exists() macro.
  selftests/bpf: Add test for bpf_ksym_exists().

 kernel/bpf/verifier.c                         | 17 ++++++++++------
 tools/lib/bpf/bpf_helpers.h                   |  3 +++
 tools/lib/bpf/libbpf.c                        |  6 ++++++
 .../selftests/bpf/progs/task_kfunc_success.c  | 20 ++++++++++++++++++-
 4 files changed, 39 insertions(+), 7 deletions(-)

-- 
2.34.1