tracing: Updates to dynamic event API

Hi Steve,

This patchset adds some updates to the 'tracing: Add support for in-kernel dynamic event API', on top of ftrace/core, addressing the comments from v4 of that:

- Consolidate the very similar functions synth_event_add_val/next_val() and inline find_synth_field(), as suggested by Steve

- Replace the command-building code in dynevent_cmd with equivalent seq_buf functionality, as suggested by Steve

- Move the check_arg callbacks from the arg objects and explicitly pass them to the add functions, as suggested by Masami

- Get rid of a useless bit of code in dynevent_add_arg_pair() as suggested by Masami

With these changes the dynamic event test modules work fine and the trigger selftests all pass.

Thanks,

Tom

The following changes since commit d380dcde9a07ca5de4805dee11f58a98ec0ad6ff:

tracing: Fix now invalid var_ref_vals assumption in trace action (2020-01-31 12:59:26 -0500)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/synth-event-gen-updates-v1

Tom Zanussi (4):
tracing: Consolidate some synth_event_trace code
tracing: Remove check_arg() callbacks from dynevent args
tracing: Remove useless code in dynevent_arg_pair_add()
tracing: Use seq_buf for building dynevent_cmd string

 include/linux/trace_events.h     |   4 +-
 kernel/trace/trace_dynevent.c    | 110 ++++++++++-----------------
 kernel/trace/trace_dynevent.h    |  11 ++-
 kernel/trace/trace_events_hist.c | 157 ++++++++++++++++-----------------------
 kernel/trace/trace_kprobe.c      |  12 +--
 5 files changed, 118 insertions(+), 176 deletions(-)

2.14.1