[PATCHv2 bpf-next 0/6] x86/fgraph,bpf: Fix ORC stack unwind from kprobe_multi

hi,
Mahe reported missing function from stack trace on top of kprobe multi
program. It turned out the latest fix [1] needs some more fixing.

v2 changes:
- keep the unwind same as for kprobes, attached function
  is part of entry probe stacktrace, not kretprobe [Steven]
- several change in trigger bench [Andrii]
- added selftests for standard kprobes and fentry/fexit probes [Andrii]

Note I'll try to add similar stacktrace adjustment for fentry/fexit
in separate patchset to not complicate this change.

thanks,
jirka


[1] https://lore.kernel.org/bpf/20251104215405.168643-1-jolsa@kernel.org/ (local)
---
Jiri Olsa (6):
      x86/fgraph: Fix return_to_handler regs.rsp value
      x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path
      selftests/bpf: Fix kprobe multi stacktrace_ips test
      selftests/bpf: Add stacktrace ips test for kprobe/kretprobe
      selftests/bpf: Add stacktrace ips test for fentry/fexit
      selftests/bpf: Allow to benchmark trigger with stacktrace

 arch/x86/include/asm/ftrace.h                           |   2 +-
 arch/x86/kernel/ftrace_64.S                             |   5 +++-
 tools/testing/selftests/bpf/bench.c                     |   4 ++++
 tools/testing/selftests/bpf/bench.h                     |   1 +
 tools/testing/selftests/bpf/benchs/bench_trigger.c      |   1 +
 tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 tools/testing/selftests/bpf/progs/stacktrace_ips.c      |  27 ++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/trigger_bench.c       |  46 +++++++++++++++++++++++++++++--------
 8 files changed, 190 insertions(+), 16 deletions(-)