Hi, Here is the 5th version of series to improve the BTF support on probe events. The previous series is here: https://lore.kernel.org/all/169078860386.173706.3091034523220945605.stgit@devnote2/ This version introduces kernel/trace/trace_btf.c to separate the btf generic functions. These functions will be moved to btf.c next merge window. This fixes the member-search function to return the bit-offset of the parent anonymous union/structure. Thus the caller can calculate the real bit-offset from the root data structure. This also fixes the ftrace selftest issue which fails if the kernel supports only BTF args but not support field access. This series can be applied on top of "probes/core" branch of https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git/ 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: Support BTF argument on module functions tracing/probes: Move finding func-proto API and getting func-param API to trace_btf tracing/probes: 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 | 64 ++- include/linux/btf.h | 1 kernel/bpf/btf.c | 2 kernel/trace/Makefile | 1 kernel/trace/trace.c | 3 kernel/trace/trace_btf.c | 109 ++++ kernel/trace/trace_btf.h | 11 kernel/trace/trace_eprobe.c | 4 kernel/trace/trace_fprobe.c | 59 ++ kernel/trace/trace_kprobe.c | 1 kernel/trace/trace_probe.c | 499 +++++++++++++++----- kernel/trace/trace_probe.h | 27 + kernel/trace/trace_uprobe.c | 1 .../ftrace/test.d/dynevent/add_remove_btfarg.tc | 20 + .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc | 10 15 files changed, 637 insertions(+), 175 deletions(-) create mode 100644 kernel/trace/trace_btf.c create mode 100644 kernel/trace/trace_btf.h -- Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
