Merge branch 'add-kernel-symbol-for-struct_ops-trampoline'

Xu Kuohai says:

====================
Add kernel symbol for struct_ops trampoline.

Without kernel symbol for struct_ops trampoline, the unwinder may
produce unexpected stacktraces. For example, the x86 ORC and FP
unwinder stops stacktrace on a struct_ops trampoline address since
there is no kernel symbol for the address.

v4:
- Add a separate cleanup patch to remove unused member rcu from
  bpf_struct_ops_map (patch 1)
- Use funcs_cnt instead of btf_type_vlen(vt) for links memory
  calculation in .map_mem_usage (patch 2)
- Include ksyms[] memory in map_mem_usage (patch 3)
- Various fixes in patch 3 (Thanks to Martin)

v3: https://lore.kernel.org/bpf/20241111121641.2679885-1-xukuohai@huaweicloud.com/
- Add a separate cleanup patch to replace links_cnt with funcs_cnt
- Allocate ksyms on-demand in update_elem() to stay with the links
  allocation way
- Set ksym name to prog__<struct_ops_name>_<member_name>

v2: https://lore.kernel.org/bpf/20241101111948.1570547-1-xukuohai@huaweicloud.com/
- Refine the commit message for clarity and fix a test bot warning

v1: https://lore.kernel.org/bpf/20241030111533.907289-1-xukuohai@huaweicloud.com/
====================

Reviewed-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241112145849.3436772-1-xukuohai@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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