[PATCHv2 0/4] x86/fgraph,bpf: Fix ORC stack unwind from return probe

[Jiri Olsa <jolsa@kernel.org>]

hi,
sending fix for ORC stack unwind issue reported in here [1], where
the ORC unwinder won't go pass the return_to_handler function and
we get no stacktrace.

Sending fix for that together with unrelated stacktrace fix (patch 1),
so the attached test can work properly.

It's based on:
  https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
  probes/for-next

v1: https://lore.kernel.org/bpf/20251027131354.1984006-1-jolsa@kernel.org/

v2 changes:
- added ack for patch 2 [Masami]
- added test for raw tp unwind

thanks,
jirka


[1] https://lore.kernel.org/bpf/aObSyt3qOnS_BMcy@krava/
---
Jiri Olsa (4):
      Revert "perf/x86: Always store regs->ip in perf_callchain_kernel()"
      x86/fgraph,bpf: Fix stack ORC unwind from kprobe_multi return probe
      selftests/bpf: Add stacktrace ips test for kprobe_multi/kretprobe_multi
      selftests/bpf: Add stacktrace ips test for raw_tp

 arch/x86/events/core.c                                  |  10 +++----
 arch/x86/include/asm/ftrace.h                           |   5 ++++
 arch/x86/kernel/ftrace_64.S                             |   8 +++++-
 include/linux/ftrace.h                                  |  10 ++++++-
 tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/stacktrace_ips.c      |  49 +++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/test_kmods/bpf_testmod.c    |  26 +++++++++++++++++
 7 files changed, 251 insertions(+), 7 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c
 create mode 100644 tools/testing/selftests/bpf/progs/stacktrace_ips.c