[PATCH bpf-next v2 0/2] Update a struct_ops link through a pinned path

[Kui-Feng Lee <thinker.li@gmail.com>]

Applications already have the ability to update a struct_ops link with
another struct_ops map. However, they were unable to open pinned paths
of the links. This implies that updating a link through its pinned
paths was not feasible. By allowing the "open" operator on pinned
paths, applications can pin a struct_ops link and update the link
through the pinned path later.

---
Changes from v1:

 - Fix a link time error for the case that CONFIG_BPF_JIT is not
   enabled. (Reported by kernel test robot)

v1: https://lore.kernel.org/all/20240417002513.1534535-1-thinker.li@gmail.com/

Kui-Feng Lee (2):
  bpf: enable the "open" operator on a pinned path of a struct_osp link.
  selftests/bpf: open a pinned path of a struct_ops link.

 include/linux/bpf.h                           |  6 ++
 kernel/bpf/bpf_struct_ops.c                   | 10 ++++
 kernel/bpf/inode.c                            | 11 +++-
 kernel/bpf/syscall.c                          | 16 +++++-
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   |  6 ++
 .../bpf/prog_tests/test_struct_ops_module.c   | 56 +++++++++++++++++++
 6 files changed, 101 insertions(+), 4 deletions(-)

-- 
2.34.1