[PATCH v2 05/11] cpuidle: Move trace_cpu_idle() into generic code

[Peter Zijlstra]

Remove trace_cpu_idle() from the arch_cpu_idle() implementations and
put it in the generic code, right before disabling RCU. Gets rid of
more trace_*_rcuidle() users.

Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Reviewed-by: Steven Rostedt (VMware) <rost...@goodmis.org>
Tested-by: Marco Elver <el...@google.com>
---
 arch/arm/mach-omap2/pm34xx.c |    4 ----
 arch/arm64/kernel/process.c  |    2 --
 arch/s390/kernel/idle.c      |    3 +--
 arch/x86/kernel/process.c    |    4 ----
 kernel/sched/idle.c          |    3 +++
 5 files changed, 4 insertions(+), 12 deletions(-)

--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -298,11 +298,7 @@ static void omap3_pm_idle(void)
        if (omap_irq_pending())
                return;
 
-       trace_cpu_idle_rcuidle(1, smp_processor_id());
-
        omap_sram_idle();
-
-       trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 }
 
 #ifdef CONFIG_SUSPEND
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -123,10 +123,8 @@ void arch_cpu_idle(void)
         * This should do all the clock switching and wait for interrupt
         * tricks
         */
-       trace_cpu_idle_rcuidle(1, smp_processor_id());
        cpu_do_idle();
        local_irq_enable();
-       trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -33,14 +33,13 @@ void enabled_wait(void)
                PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
        clear_cpu_flag(CIF_NOHZ_DELAY);
 
-       trace_cpu_idle_rcuidle(1, smp_processor_id());
        local_irq_save(flags);
        /* Call the assembler magic in entry.S */
        psw_idle(idle, psw_mask);
        local_irq_restore(flags);
-       trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 
        /* Account time spent with enabled wait psw loaded as idle time. */
+       /* XXX seqcount has tracepoints that require RCU */
        write_seqcount_begin(&idle->seqcount);
        idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
        idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -684,9 +684,7 @@ void arch_cpu_idle(void)
  */
 void __cpuidle default_idle(void)
 {
-       trace_cpu_idle_rcuidle(1, smp_processor_id());
        safe_halt();
-       trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 }
 #if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE)
 EXPORT_SYMBOL(default_idle);
@@ -792,7 +790,6 @@ static int prefer_mwait_c1_over_halt(con
 static __cpuidle void mwait_idle(void)
 {
        if (!current_set_polling_and_test()) {
-               trace_cpu_idle_rcuidle(1, smp_processor_id());
                if (this_cpu_has(X86_BUG_CLFLUSH_MONITOR)) {
                        mb(); /* quirk */
                        clflush((void *)&current_thread_info()->flags);
@@ -804,7 +801,6 @@ static __cpuidle void mwait_idle(void)
                        __sti_mwait(0, 0);
                else
                        local_irq_enable();
-               trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
        } else {
                local_irq_enable();
        }
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -91,11 +91,14 @@ void __cpuidle default_idle_call(void)
        if (current_clr_polling_and_test()) {
                local_irq_enable();
        } else {
+
+               trace_cpu_idle(1, smp_processor_id());
                stop_critical_timings();
                rcu_idle_enter();
                arch_cpu_idle();
                rcu_idle_exit();
                start_critical_timings();
+               trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
        }
 }