tracing: trace event error_log and inter-event bugfixes

Hi Steve,

Here are a few patches that should be applied on top of the 'Inter-event (e.g. latency) support v9' patchset.

The first fixes another problem I noticed when printing flags.

The rest implement the tracing/events/error_log suggested by Masami, and update the inter-event code to use it (and remove the old hist file error mechanism).

Thanks,

Tom

The following changes since commit 404bb11b24fb9a592023c077b878d30ad6da4322:

tracing: Enforce passing in filter=NULL to create_filter() (2018-04-11 11:18:42 -0400)

are available in the git repository at:

https://github.com/tzanussi/linux-trace-inter-event.git tzanussi/inter-event-update2
https://github.com/tzanussi/linux-trace-inter-event/tree/tzanussi/inter-event-update2

Tom Zanussi (6):
tracing: Restore proper field flag printing when displaying triggers
tracing: Add trace event error log
tracing: Save the last hist command's associated event name
tracing: Use trace event error_log with hist triggers
tracing: Add field parsing trace event errors for hist triggers
selftests: ftrace: Fix extended error support testcase

 kernel/trace/trace.h                               |   3 +
 kernel/trace/trace_events.c                        | 172 +++++++++++++++++++
 kernel/trace/trace_events_hist.c                   | 188 +++++++++++----------
 .../inter-event/trigger-extended-error-support.tc  |   2 +-
 4 files changed, 274 insertions(+), 91 deletions(-)

1.9.3