[PATCH v2 0/9] tracing: Improbe BTF support on probe events

[Masami Hiramatsu (Google)]

Hi,

Here is the 2nd version of series to improve the BTF support on probe events.
The previous series is here:

https://lore.kernel.org/linux-trace-kernel/168699521817.528797.13179901018528120324.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

In this version, I added a NULL check fix patch [1/9] (which will go to
fixes branch) and move BTF related API to kernel/bpf/btf.c [2/9] and add
a new BTF API [3/9] so that anyone can reuse it.
Also I decided to use '$retval' directly instead of 'retval' pseudo BTF
variable for field access at [5/9] because I introduced an idea to choose
function 'exit' event automatically if '$retval' is used [7/9]. With that
change, we can not use 'retval' because if a function has 'retval'
argument, we can not decide 'f func retval' is function exit or entry.
Selftest test case [8/9] and document [9/9] are also updated according to
those changes.

This series can be applied on top of "v6.5-rc2" kernel.

You can also get this series from:

git://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/fprobe-event-ext


Thank you,

---

Masami Hiramatsu (Google) (9):
      tracing/probes: Fix to add NULL check for BTF APIs
      bpf/btf: tracing: Move finding func-proto API and getting func-param API to BTF
      bpf/btf: Add a function to search a member of a struct/union
      tracing/probes: Support BTF based data structure field access
      tracing/probes: Support BTF field access from $retval
      tracing/probes: Add string type check with BTF
      tracing/fprobe-event: Assume fprobe is a return event by $retval
      selftests/ftrace: Add BTF fields access testcases
      Documentation: tracing: Update fprobe event example with BTF field


 Documentation/trace/fprobetrace.rst                |   50 ++
 include/linux/btf.h                                |    7 
 kernel/bpf/btf.c                                   |   83 ++++
 kernel/trace/trace_fprobe.c                        |   58 ++-
 kernel/trace/trace_probe.c                         |  402 +++++++++++++++-----
 kernel/trace/trace_probe.h                         |   12 +
 .../ftrace/test.d/dynevent/add_remove_btfarg.tc    |   11 +
 .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |    6 
 8 files changed, 503 insertions(+), 126 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>