From: Alexei Starovoitov <ast@kernel.org>

v1->v2:
- Addressed great feedback from Andrii and Toke.
- Fixed race between parallel bpf_timer_*() ops.
- Fixed deadlock between timer callback and LRU eviction or bpf_map_delete/update.
- Disallowed mmap and global timers.
- Allow bpf_spin_lock and bpf_timer in an element. One of each.
- Fixed memory leaks due to map destruction and LRU eviction.
- Add support for specifying clockid in bpf_timer_init.
- Make bpf_timer helpers gpl_only.
- Fix key pointer in callback_fn when bpf_timer is inside array.
- A ton more tests.

The 1st patch implements interaction between bpf programs and bpf core.
The 2nd patch implements necessary safety checks.
The 3rd patch is the test.

Alexei Starovoitov (3):
  bpf: Introduce bpf_timer
  bpf: Add verifier checks for bpf_timer.
  selftests/bpf: Add bpf_timer test.

 include/linux/bpf.h                           |  47 ++-
 include/linux/btf.h                           |   1 +
 include/uapi/linux/bpf.h                      |  40 +++
 kernel/bpf/arraymap.c                         |  14 +
 kernel/bpf/btf.c                              |  77 ++++-
 kernel/bpf/hashtab.c                          |  56 +++-
 kernel/bpf/helpers.c                          | 227 ++++++++++++++
 kernel/bpf/local_storage.c                    |   4 +-
 kernel/bpf/map_in_map.c                       |   1 +
 kernel/bpf/syscall.c                          |  21 +-
 kernel/bpf/verifier.c                         | 133 ++++++++
 kernel/trace/bpf_trace.c                      |   2 +-
 scripts/bpf_doc.py                            |   2 +
 tools/include/uapi/linux/bpf.h                |  40 +++
 .../testing/selftests/bpf/prog_tests/timer.c  |  55 ++++
 tools/testing/selftests/bpf/progs/timer.c     | 293 ++++++++++++++++++
 16 files changed, 970 insertions(+), 43 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/timer.c
 create mode 100644 tools/testing/selftests/bpf/progs/timer.c

-- 
2.30.2