Add a "within" filter predicate that tests whether a given function
appears in the current call stack at event time. The function name
is resolved to its address range via kallsyms during filter setup;
at runtime, stack_trace_save() captures the call stack and compares
each return address against the stored range.

Changes since v1: https://lore.kernel.org/linux-trace-kernel/20260608145556.94931-1-chenjun102@huawei.com

- Added patch to show error message

Chen Jun (1):
      tracing: Add "within" filter for call-stack-based event filtering

Steven Rostedt (1):
      tracnig: Add proper error message for glob use with "within" filter

----
 Documentation/trace/events.rst     | 12 +++++++++++
 include/linux/trace_events.h       |  1 +
 kernel/trace/trace.h               |  3 ++-
 kernel/trace/trace_events.c        |  3 +++
 kernel/trace/trace_events_filter.c | 44 ++++++++++++++++++++++++++++++++++++--
 5 files changed, 60 insertions(+), 3 deletions(-)