[PATCH bpf v2 0/2] bpf: add _impl suffix for kfuncs with implicit args

[Mykyta Yatsenko <mykyta.yatsenko5@gmail.com>]

We’re introducing support for implicit kfunc arguments and need to
rename new kfuncs to comply with the naming convention.
This new feature, will for each kfunc of the form:

`bpf_foo_impl(args..., aux__prog)`

generate a public BTF type:

`bpf_foo(args...)`

and the verifier will resolve calls to bpf_foo() to bpf_foo_impl(),
supplying a valid struct bpf_prog_aux via aux__prog.

Three kfuncs added in 6.18 don’t follow this *_impl convention and
therefore won’t participate in the new mechanism:
 * bpf_task_work_schedule_resume()
 * bpf_task_work_schedule_signal()
 * bpf_stream_vprintk()

Rename them to align with the implicit-arg flow:
bpf_task_work_schedule_resume() -> bpf_task_work_schedule_resume_impl()
bpf_task_work_schedule_signal() -> bpf_task_work_schedule_signal_impl()
bpf_stream_vprintk() -> bpf_stream_vprintk_impl()

The implicit-arg mechanism is not in tree yet, so callers must switch to
the *_impl names for now. Once the new mechanism lands, the plain
names (without _impl) will be reintroduced as BTF-visible entry points
and will resolve to the _impl versions automatically.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
Changes in v1:
- Split commit into 2
- Rebase on the correct branch
- Link to v1: https://lore.kernel.org/all/20251103232319.122965-1-mykyta.yatsenko5@gmail.com/

---
Mykyta Yatsenko (2):
      bpf:add _impl suffix for bpf_task_work_schedule* kfuncs
      bpf:add _impl suffix for bpf_stream_vprintk() kfunc

 kernel/bpf/helpers.c                               | 26 +++++++++++---------
 kernel/bpf/stream.c                                |  3 ++-
 kernel/bpf/verifier.c                              | 12 +++++-----
 tools/bpf/bpftool/Documentation/bpftool-prog.rst   |  2 +-
 tools/lib/bpf/bpf_helpers.h                        | 28 +++++++++++-----------
 tools/testing/selftests/bpf/progs/stream_fail.c    |  6 ++---
 tools/testing/selftests/bpf/progs/task_work.c      |  6 ++---
 tools/testing/selftests/bpf/progs/task_work_fail.c |  8 +++----
 .../testing/selftests/bpf/progs/task_work_stress.c |  4 ++--
 9 files changed, 50 insertions(+), 45 deletions(-)
---
base-commit: 6146a0f1dfae5d37442a9ddcba012add260bceb0
change-id: 20251104-implv2-d6c4be255026

Best regards,
-- 
Mykyta Yatsenko <yatsenko@meta.com>