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[PATCH v5 0/2] tracing: Add trace events for preemption and irq disable/enable

These patches add trace events support for preempt and irq disable/enable
events. This version has few changes suggested by Steven as well.

I am looking forward to getting these accepted for v4.15 if possible. I based
it on Linus's master, please let me know if there is another branch I need to
rebase on. thanks!

Changes since v4:
- Use static inline instead of defines for tracer functions.
- Moved new per-cpu variables to protect from recursion to the correct defines.
- Dropped bug fix patch (3/3) not related to series and will submit that separately.

Here's an example of how Android's systrace will be using it to show critical
sections as a gantt chart: http://imgur.com/download/TZplEVp

Links to earlier series:
v4: https://lkml.org/lkml/2017/9/6/724
v3: https://lkml.org/lkml/2017/9/3/15

Joel Fernandes (2):
  tracing: Prepare to add preempt and irq trace events
  tracing: Add support for preempt and irq enable/disable events

 include/linux/ftrace.h            |   3 +-
 include/linux/irqflags.h          |   4 +-
 include/trace/events/preemptirq.h |  62 ++++++++++++++
 kernel/trace/Kconfig              |   9 ++
 kernel/trace/Makefile             |   1 +
 kernel/trace/trace_irqsoff.c      | 176 +++++++++++++++++++++++++++++++-------
 6 files changed, 222 insertions(+), 33 deletions(-)
 create mode 100644 include/trace/events/preemptirq.h

Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: kernel-team@xxxxxxxxxxx