[GIT PULL] probes: Updates for v7.3

Hi Linus,

Probes updates for v7.3:

- probes: Advanced BTF typecasting and variable fetch enhancements
  . Typecast support across probe events: Extended BTF typecasting syntax
    (e.g., (STRUCT)PARAM->MEMBER) to kprobes, uprobes, and fprobes on
    function entry and return.
  . Nested typecasts: Added support for chaining and nesting typecasts up
    to 3 levels, including casting registers and stack variables.
  . Field specifier option: Added (STRUCT,FIELD) syntax to emulate
    container_of(), allowing retrieval of parent structures from member
    pointers.
  . $current variable support: Introduced $current special variable to
    access the running task_struct via BTF dereferencing.
  . Per-CPU variable access: Added this_cpu_read() and this_cpu_ptr()
    fetcharg methods to trace CPU-local data safely.
  . Fetcharg bytecode dumper: Added CONFIG_PROBE_EVENTS_DUMP_FETCHARG to
    dump the compiled fetcharg bytecode instructions as comments in
    dynamic_events.
  . Extended symbol name handling: Removed the MAX_COMMON_HEAD_LEN limit
    and extended MAX_ARGSTR_LEN to 256 bytes, enabling probing of long
    symbols, mangled Rust symbols and complex BTF expressions.
  . eprobe variable syntax: Allowed eprobes to reference event fields
    directly without requiring a '$' prefix.
  . Cleanup unused parameters, redundant codes, duplicate macros and
    pointer arithmetic.
  . Use a ternary operator for simplifying fetch_type_from_btf_type().

- bootconfig / boottime-trace: Expanded dynamic probe support
  . Added boot-time tracing configuration support for event probes
    (eprobes), function probes (fprobes), and tracepoint probes
    (tprobes).
  . ftrace2bootconfig: Allowed comment lines ('#') in dynamic_events file.

- fprobe / kprobe: Optimization, robustness, and cleanups
  . fprobe: Simplified fprobe_remove_ips() by reusing graph and ftrace
    helpers.
  . fprobe: Removed __packed attribute from struct __fprobe_header to avoid
    unaligned memory access penalties on RISC architectures.
  . kprobe & fprobe: Removed redundant memset() calls in perf event probe
    handlers.
  . kprobes: Replaced legacy __ASSEMBLY__ with __ASSEMBLER__ in header
    files.

- selftests & refactoring:
  . Refactored parse_probe_arg() and parse_probe_vars(), and eliminated
    recursion in probe argument parsing to protect kernel stack depth.
  . Added selftests for BTF typecasts and module probing without module
    prefixes.
  . Forced LC_ALL=C in ftracetest to prevent test failures on localized
    systems.
  . Refactored btf_type_skip_modifiers() to remove ignored id parameter.
  . Sorted ERRORS list in trace_probe.h alphabetically.
  . Fixed typo in fprobe docs, and trace_fprobe function name.
  . Renamed FETCH_OP_DATA to FETCH_OP_IMMSTR.
  . Made file offset error message probe-agnostic.


Please pull the latest probes-v7.3 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
probes-v7.3

Tag SHA1: 25c070753f4404d31582d0d25a32e4a95f2c5486
Head SHA1: 29a86c5e6361caffa7e75e891169e813f82ff688


Markus Schneider-Pargmann (The Capable Hub) (1):
      tracing: fprobe: Remove __packed from generic __fprobe_header

Martin Kaiser (2):
      tracing: trace_fprobe: fix typo in function name
      tracing/probes: ignore id update from btf_type_skip_modifiers

Masami Hiramatsu (5):
      tracing/probes: Refactor parse_probe_vars()
      tracing/probes: Refactor parse_probe_arg()
      tracing/probes: Sort ERRORS list in trace_probe.h alphabetically
      tracing/probes: Extend max length of argument string
      tracing/probes: Eliminate recursion in parse_probe_arg()

Masami Hiramatsu (Google) (25):
      tracing/probes: Rename FETCH_OP_DATA to FETCH_OP_IMMSTR
      tracing/probes: Allow eprobe to use variable without $ prefix
      tracing/probes: Support dumping fetcharg program for debugging dynamic events
      tools/bootconfig: Ignore comment lines in dynamic_events/kprobe_events file
      tracing/probes: Support typecast for various probe events
      tracing/probes: Support nested typecast
      tracing/probes: Type casting always involves nested calls
      tracing/probes: Support field specifier option for typecast
      tracing/probes: Add $current variable support
      tracing/probes: Add this_cpu_read() and this_cpu_ptr() dereference method to fetcharg
      tracing/probes: Add a new testcase for BTF typecasts
      selftests/ftrace: Add test case for a symbol in a module without module name
      tracing/probes: Remove duplicate MAX_ARRAY_LEN macro definition
      tracing/probes: Remove redundant boolean conversion in trace_probe_has_single_file()
      tracing/probes: Remove redundant bounds check in trace_probe_compare_arg_type()
      tracing/probes: Remove unused parameter from parse_probe_var_retval()
      tracing/probes: Cleanup pointer arithmetic in store_trace_entry_data()
      tracing/probes: Simplify BTF_KIND_PTR case in fetch_type_from_btf_type()
      tracing/fprobe: Remove redundant snprintf in trace_fprobe_match_command_head()
      tracing/fprobe: Remove redundant memset in fentry_perf_func()
      tracing/kprobe: Remove redundant memset in kprobe_perf_func()
      tracing/probes: Fix extra whitespace in trace_probe_kernel.h
      tracing/probes: Treating longer symbol name on event comparation
      tracing/boot: Add support for eprobe, fprobe, and tprobe events
      fprobe: Simplify fprobe_remove_ips() by reusing existing helpers

Rui Qi (1):
      selftests/ftrace: Force C locale in ftracetest

Thomas Huth (1):
      kprobes: Replace __ASSEMBLY__ with __ASSEMBLER__ in header file

Yudistira Putra (1):
      tracing/probes: make file offset error message probe-agnostic

shaikh.kamal (1):
      docs: trace: fprobe: fix 'thos' spelling

----
 Documentation/trace/boottime-trace.rst             |   18 +-
 Documentation/trace/eprobetrace.rst                |    7 +-
 Documentation/trace/fprobe.rst                     |    2 +-
 Documentation/trace/fprobetrace.rst                |   10 +
 Documentation/trace/kprobetrace.rst                |   11 +
 include/asm-generic/kprobes.h                      |    4 +-
 kernel/trace/Kconfig                               |   12 +
 kernel/trace/fprobe.c                              |   13 +-
 kernel/trace/trace.c                               |    8 +-
 kernel/trace/trace_boot.c                          |   97 ++
 kernel/trace/trace_dynevent.c                      |    5 +
 kernel/trace/trace_eprobe.c                        |    2 +
 kernel/trace/trace_fprobe.c                        |   12 +-
 kernel/trace/trace_kprobe.c                        |   27 +-
 kernel/trace/trace_probe.c                         | 1183 ++++++++++++++------
 kernel/trace/trace_probe.h                         |  278 +++--
 kernel/trace/trace_probe_kernel.h                  |    2 +-
 kernel/trace/trace_probe_tmpl.h                    |   27 +-
 kernel/trace/trace_uprobe.c                        |    5 +-
 samples/trace_events/trace-events-sample.c         |   40 +-
 samples/trace_events/trace-events-sample.h         |   34 +-
 tools/bootconfig/scripts/ftrace2bconf.sh           |    2 +
 tools/testing/selftests/ftrace/ftracetest          |    3 +
 .../ftrace/test.d/dynevent/btf_probe_event.tc      |   51 +
 .../test.d/dynevent/btf_typecast_accepted.tc       |  103 ++
 .../test.d/dynevent/eprobes_syntax_errors.tc       |   12 +-
 .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |   16 +-
 .../ftrace/test.d/dynevent/tprobe_syntax_errors.tc |    4 +-
 .../ftrace/test.d/kprobe/kprobe_module.tc          |    6 +
 .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc   |   16 +-
 .../ftrace/test.d/kprobe/uprobe_syntax_errors.tc   |    5 +
 31 files changed, 1525 insertions(+), 490 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/btf_probe_event.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/btf_typecast_accepted.tc

-- 
Masami Hiramatsu (Google) <[email protected]>