cpufreq: fix a -Wimplicit-function-declaration

raveit65 · raveit65 · commit 0746a55cd53d · 2018-07-10T11:50:06.000+02:00
happens if build with -lcpupower and kernel 4.7+

```
cpufreq-monitor-libcpufreq.c: In function 'cpufreq_monitor_libcpufreq_run':
cpufreq-monitor-libcpufreq.c:117:7: warning: implicit declaration of function 'cpupower_is_cpu_online' [-Wimplicit-function-declaration]
   if (cpupower_is_cpu_online (cpu)) {
       ^~~~~~~~~~~~~~~~~~~~~~
```
diff --git a/cpufreq/src/cpufreq-monitor-libcpufreq.c b/cpufreq/src/cpufreq-monitor-libcpufreq.c
@@ -98,6 +98,10 @@ cpufreq_monitor_libcpufreq_new (guint cpu)
         return CPUFREQ_MONITOR (monitor);
 }
 
+#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 7, 0)
+extern int cpupower_is_cpu_online (unsigned int cpu);
+#endif
+
 static gboolean
 cpufreq_monitor_libcpufreq_run (CPUFreqMonitor *monitor)
 {

Original file line number	Diff line number	Diff line change
`@@ -98,6 +98,10 @@ cpufreq_monitor_libcpufreq_new (guint cpu)`
`98`	`98`	`return CPUFREQ_MONITOR (monitor);`
`99`	`99`	`}`
`100`	`100`
	`101`	`+#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 7, 0)`
	`102`	`+extern int cpupower_is_cpu_online (unsigned int cpu);`
	`103`	`+#endif`
	`104`	`+`
`101`	`105`	`static gboolean`
`102`	`106`	`cpufreq_monitor_libcpufreq_run (CPUFreqMonitor *monitor)`
`103`	`107`	`{`