rcu: Refactor rcu_{nmi,irq}_{enter,exit}()

rcu: Refactor rcu_{nmi,irq}_{enter,exit}()

When entering or exiting irq or NMI handlers, the current code uses
->dynticks_nmi_nesting to detect if it is in the outermost handler,
that is, the one interrupting or returning to an RCU-idle context (the
idle loop or nohz_full usermode execution).  When entering the outermost
handler via an interrupt (as opposed to NMI), it is necessary to invoke
rcu_dynticks_task_exit() just before the CPU is marked non-idle from an
RCU perspective and to invoke rcu_cleanup_after_idle() just after the
CPU is marked non-idle.  Similarly, when exiting the outermost handler
via an interrupt, it is necessary to invoke rcu_prepare_for_idle() just
before marking the CPU idle and to invoke rcu_dynticks_task_enter()
just after marking the CPU idle.

The decision to execute these four functions is currently taken in
rcu_irq_enter() and rcu_irq_exit() as follows:

   rcu_irq_enter()
      /* A conditional branch with ->dynticks_nmi_nesting */
      rcu_nmi_enter()
         /* A conditional branch with ->dynticks */
      /* A conditional branch with ->dynticks_nmi_nesting */

   rcu_irq_exit()
      /* A conditional branch with ->dynticks_nmi_nesting */
      rcu_nmi_exit()
         /* A conditional branch with ->dynticks_nmi_nesting */
      /* A conditional branch with ->dynticks_nmi_nesting */

   rcu_nmi_enter()
      /* A conditional branch with ->dynticks */

   rcu_nmi_exit()
      /* A conditional branch with ->dynticks_nmi_nesting */

This works, but the conditional branches in rcu_irq_enter() and
rcu_irq_exit() are redundant with those in rcu_nmi_enter() and
rcu_nmi_exit(), respectively.  Redundant branches are not something
we want in the to/from-idle fastpaths, so this commit refactors
rcu_{nmi,irq}_{enter,exit}() so they use a common inlined function passed
a constant argument as follows:

   rcu_irq_enter() inlining rcu_nmi_enter_common(irq=true)
      /* A conditional branch with ->dynticks */

   rcu_irq_exit() inlining rcu_nmi_exit_common(irq=true)
      /* A conditional branch with ->dynticks_nmi_nesting */

   rcu_nmi_enter() inlining rcu_nmi_enter_common(irq=false)
      /* A conditional branch with ->dynticks */

   rcu_nmi_exit() inlining rcu_nmi_exit_common(irq=false)
      /* A conditional branch with ->dynticks_nmi_nesting */

The combination of the constant function argument and the inlining allows
the compiler to discard the conditionals that previously controlled
execution of rcu_dynticks_task_exit(), rcu_cleanup_after_idle(),
rcu_prepare_for_idle(), and rcu_dynticks_task_enter().  This reduces both
the to-idle and from-idle path lengths by two conditional branches each,
and improves readability as well.

This commit also changes order of execution from this:

	rcu_dynticks_task_exit();
	rcu_dynticks_eqs_exit();
	trace_rcu_dyntick();
	rcu_cleanup_after_idle();

To this:

	rcu_dynticks_task_exit();
	rcu_dynticks_eqs_exit();
	rcu_cleanup_after_idle();
	trace_rcu_dyntick();

In other words, the calls to rcu_cleanup_after_idle() and
trace_rcu_dyntick() are reversed.  This has no functional effect because
the real concern is whether a given call is before or after the call to
rcu_dynticks_eqs_exit(), and this patch does not change that.  Before the
call to rcu_dynticks_eqs_exit(), RCU is not yet watching the current
CPU and after that call RCU is watching.

A similar switch in calling order happens on the idle-entry path, with
similar lack of effect for the same reasons.

Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Applied Steven Rostedt feedback. ]
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>