Changes v1 => v2:
1. Share irq_work with stackmap.c. (Daniel)
2. Add tests for illegal writes to task/vma from the callback function.
   (Daniel)
3. Other small fixes.

Add helper bpf_find_vma. This can be used in some profiling use cases. It
might also be useful for LSM.

Song Liu (2):
  bpf: introduce helper bpf_find_vma
  selftests/bpf: add tests for bpf_find_vma

 include/linux/bpf.h                           |   1 +
 include/uapi/linux/bpf.h                      |  20 +++
 kernel/bpf/mmap_unlock_work.h                 |  65 ++++++++++
 kernel/bpf/stackmap.c                         |  71 +++--------
 kernel/bpf/task_iter.c                        |  49 ++++++++
 kernel/bpf/verifier.c                         |  36 ++++++
 kernel/trace/bpf_trace.c                      |   2 +
 tools/include/uapi/linux/bpf.h                |  20 +++
 .../selftests/bpf/prog_tests/find_vma.c       | 115 ++++++++++++++++++
 tools/testing/selftests/bpf/progs/find_vma.c  |  70 +++++++++++
 .../selftests/bpf/progs/find_vma_fail1.c      |  30 +++++
 .../selftests/bpf/progs/find_vma_fail2.c      |  30 +++++
 12 files changed, 454 insertions(+), 55 deletions(-)
 create mode 100644 kernel/bpf/mmap_unlock_work.h
 create mode 100644 tools/testing/selftests/bpf/prog_tests/find_vma.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma_fail1.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma_fail2.c

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2.30.2