Merge branch 'bpf-x86-unwind-orc-support-reliable-unwinding-through-bpf-stack-frames'

Josh Poimboeuf says:

====================
bpf, x86/unwind/orc: Support reliable unwinding through BPF stack frames

Fix livepatch stalls which may be seen when a task is blocked with BPF
JIT on its kernel stack.

Changes since v1 (https://lore.kernel.org/cover.1764699074.git.jpoimboe@kernel.org):
- fix NULL ptr deref in __arch_prepare_bpf_trampoline()
====================

Link: https://patch.msgid.link/cover.1764818927.git.jpoimboe@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>