x86, perf: Add power_end event to process_*.c cpu_idle routine

Systems using the idle thread from process_32.c and process_64.c
do not generate power_end events which could be traced using
perf. This patch adds the event generation for such systems.

Signed-off-by: Robert Schoene <robert.schoene@tu-dresden.de>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1276515440.5441.45.camel@localhost>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/process_32.c

@@ -57,6 +57,8 @@
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
 
+#include <trace/events/power.h>
+
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
 /*
@@ -111,6 +113,8 @@ void cpu_idle(void)
 			stop_critical_timings();
 			pm_idle();
 			start_critical_timings();
+
+			trace_power_end(smp_processor_id());
 		}
 		tick_nohz_restart_sched_tick();
 		preempt_enable_no_resched();

arch/x86/kernel/process_64.c

@@ -51,6 +51,8 @@
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
 
+#include <trace/events/power.h>
+
 asmlinkage extern void ret_from_fork(void);
 
 DEFINE_PER_CPU(unsigned long, old_rsp);
@@ -138,6 +140,9 @@ void cpu_idle(void)
 			stop_critical_timings();
 			pm_idle();
 			start_critical_timings();
+
+			trace_power_end(smp_processor_id());
+
 			/* In many cases the interrupt that ended idle
 			   has already called exit_idle. But some idle
 			   loops can be woken up without interrupt. */