[PATCH v2 0/2] tracing: Fix removal of eprobes and add test

[Steven Rostedt]

When doing the following:

 # echo 'e:hrstate timer/hrtimer_cancel state=+0x38($hrtimer):u8' >> dynamic_events

 # echo '-:hrstate timer/hrtimer_cancel state=+0x38($hrtimer):u8' >> dynamic_events

It errors out with -ENOENT. This is because the "match" function does not
take into account the "timer/hrtimer_cancel" part. Fix it and also make it
work more genericly like kprobes and uprobes.

v1 at: https://lore.kernel.org/all/20211013234206.37dd18ffcc2a2cbf4493f125@xxxxxxxxxx/

Changes since v1:
 - Instead of just fixing the missing system/event, have it be more like
   kprobes and uprobes.

Steven Rostedt (VMware) (2):
      tracing: Fix event probe removal from dynamic events
      selftests/ftrace: Update test for more eprobe removal process

----
 kernel/trace/trace_eprobe.c                        | 54 ++++++++++++++++++++--
 .../ftrace/test.d/dynevent/add_remove_eprobe.tc    | 54 +++++++++++++++++++++-
 2 files changed, 103 insertions(+), 5 deletions(-)