[PATCH 6.1 00/16] Fixes bpf and rcu

[Alexey Nepomnyashih <sdl@nppct.ru>]

Hi, this series backports fix https://syzkaller.appspot.com/bug?id=d4d4abdb121f42913b3a149f2d846a7dd7eeb7e2 linux-6.1.y

Here is the summary with links:
  - [6.1 01/16] bpf: Add a few bpf mem allocator functions.
    https://git.kernel.org/bpf/bpf/c/e65a5c6edbc6

  - [6.1 02/16] bpf: Factor out a common helper free_all().
    https://git.kernel.org/bpf/bpf/c/aa7881fcfe9d

  - [6.1 03/16] bpf: Rename few bpf_mem_alloc fields.
    https://git.kernel.org/bpf/bpf/c/12c8d0f4c870

  - [6.1 04/16] bpf: Let free_all() return the number of freed elements.
    https://git.kernel.org/bpf/bpf/c/9de3e81521b4

  - [6.1 05/16] bpf: Refactor alloc_bulk().
    https://git.kernel.org/bpf/bpf/c/05ae68656a8e

  - [6.1 07/16] bpf: Use rcu_trace_implies_rcu_gp() in bpf memory allocator.
    https://git.kernel.org/bpf/bpf/c/59be91e5e70a

  - [6.1 08/16] bpf: Further refactor alloc_bulk().
    https://git.kernel.org/bpf/bpf/c/7468048237b8

  - [6.1 09/16] bpf: Change bpf_mem_cache draining process.
    https://git.kernel.org/bpf/bpf/c/d114dde245f9

  - [6.1 10/16] bpf: Add a hint to allocated objects.
    https://git.kernel.org/bpf/bpf/c/822fb26bdb55

  - [6.1 11/16] bpf: Introduce bpf_mem_free_rcu() similar to kfree_rcu().
    https://git.kernel.org/bpf/bpf/c/5af6807bdb10

  - [6.1 12/16] rcu: Fix missing nocb gp wake on rcu_barrier()
    https://git.kernel.org/bpf/bpf/c/b8f7aca3f0e0

  - [6.1 13/16] rcu: Make call_rcu() lazy to save power
    https://git.kernel.org/bpf/bpf/c/3cb278e73be5

  - [6.1 14/16] rcu: Export rcu_request_urgent_qs_task()
    https://git.kernel.org/bpf/bpf/c/43a89baecfe2

  - [6.1 15/16] bpf: Remove unnecessary check when updating LPM trie
    https://git.kernel.org/bpf/bpf/c/156c977c539e

  - [6.1 16/16] bpf: Switch to bpf mem allocator for LPM trie
    https://git.kernel.org/bpf/bpf/c/3d8dc43eb2a3