Fix: tracing: Centralize preemptirq tracepoints (4.19)

Fix: tracing: Centralize preemptirq tracepoints (4.19)

See upstream commit:

  commit c3bc8fd637a9623f5c507bd18f9677effbddf584
  Author: Joel Fernandes (Google) <joel@joelfernandes.org>
  Date:   Mon Jul 30 15:24:23 2018 -0700

    tracing: Centralize preemptirq tracepoints and unify their usage

    This patch detaches the preemptirq tracepoints from the tracers and
    keeps it separate.

    Advantages:
    * Lockdep and irqsoff event can now run in parallel since they no longer
    have their own calls.

    * This unifies the usecase of adding hooks to an irqsoff and irqson
    event, and a preemptoff and preempton event.
      3 users of the events exist:
      - Lockdep
      - irqsoff and preemptoff tracers
      - irqs and preempt trace events

    The unification cleans up several ifdefs and makes the code in preempt
    tracer and irqsoff tracers simpler. It gets rid of all the horrific
    ifdeferry around PROVE_LOCKING and makes configuration of the different
    users of the tracepoints more easy and understandable. It also gets rid
    of the time_* function calls from the lockdep hooks used to call into
    the preemptirq tracer which is not needed anymore. The negative delta in
    lines of code in this patch is quite large too.

    In the patch we introduce a new CONFIG option PREEMPTIRQ_TRACEPOINTS
    as a single point for registering probes onto the tracepoints. With
    this,
    the web of config options for preempt/irq toggle tracepoints and its
    users becomes:

     PREEMPT_TRACER   PREEMPTIRQ_EVENTS  IRQSOFF_TRACER PROVE_LOCKING
           |                 |     \         |           |
           \    (selects)    /      \        \ (selects) /
          TRACE_PREEMPT_TOGGLE       ----> TRACE_IRQFLAGS
                          \                  /
                           \ (depends on)   /
                         PREEMPTIRQ_TRACEPOINTS

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>