static int
restart_trace(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
unsigned int cpu;
volatile int *pwr_down;
cpu = (unsigned int)hcpu;
switch (action) {
case CPU_STARTING:
switch (cpu) {
case 1:
case 2:
case 3:
pwr_down = &get_cpu_var(trace_pwr_down);
if (*pwr_down) {
trace_start_by_cpus(cpumask_of(cpu), 0);
*pwr_down = 0;
}
put_cpu_var(trace_pwr_down);
break;
default:
break;
}
break;
case CPU_DYING:
switch (cpu) {
#if 0
case 2:
case 3:
if (!cpu_online(cpu ^ 1)) {
per_cpu(trace_pwr_down, 2) = 1;
per_cpu(trace_pwr_down, 3) = 1;
}
break;
#endif
default:
break;
}
break;
default:
break;
}
return NOTIFY_OK;
}
void trace_start_dormant(void)
{
int cpu;
trace_start_by_cpus(cpumask_of(0), 1);
/*
* XXX: This function is called just before entering the suspend mode.
* The Linux kernel is already freeze.
* So it is safe to do the trick to access the per-cpu variable directly.
*/
for (cpu = 1; cpu < NR_CPUS; cpu++) {
per_cpu(trace_pwr_down, cpu) = 1;
}
}
static int
restart_trace(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
unsigned int cpu;
volatile int *pwr_down;
cpu = (unsigned int)hcpu;
unsigned int cpu_ix = 0;
switch (action) {
case CPU_STARTING:
switch (cpu) {
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
pwr_down = &get_cpu_var(trace_pwr_down);
if (*pwr_down) {
trace_start_by_cpus(cpumask_of(cpu), 0);
*pwr_down = 0;
}
put_cpu_var(trace_pwr_down);
break;
default:
break;
}
break;
case CPU_DYING:
switch (cpu) {
case 4:
case 5:
case 6:
case 7:
if (num_possible_cpus() > 4)
{
if ((!cpu_online(4)) && (!cpu_online(5)) && (!cpu_online(6)) && (!cpu_online(7))) {
// num_possible_cpus could be 4, 6, 8
for (cpu_ix = 4; cpu_ix < num_possible_cpus(); cpu_ix++) {
per_cpu(trace_pwr_down, cpu_ix) = 1;
}
}
}
break;
default:
break;
}
break;
default:
break;
}
return NOTIFY_OK;
}