bpf: Introduce rbtree map

[kernel-patches-bot]

Pull request for series with
subject: bpf: Add verifier support for custom callback return range
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=672525

[kernel-patches-bot]

Master branch: 2eb6804
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=672525
version: 1

Pull request is NOT updated. Failed to apply https://patchwork.kernel.org/project/netdevbpf/list/?series=672525
error message:

Cmd('git') failed due to: exit code(128)
  cmdline: git am -3
  stdout: 'Applying: bpf: Add verifier support for custom callback return range
Applying: bpf: Add verifier check for BPF_PTR_POISON retval and arg
Applying: bpf: Add rb_node_off to bpf_map
Applying: bpf: Add rbtree map
Patch failed at 0004 bpf: Add rbtree map
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".'
  stderr: 'error: sha1 information is lacking or useless (kernel/bpf/helpers.c).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch'

conflict:

[kernel-patches-bot]

At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=672525 expired. Closing PR.