提交 11ab244c 编写于 作者: H Heiko Carstens 提交者: Martin Schwidefsky

[S390] Make sure enabled wait psw is loaded in default_idle.

If both NO_IDLE_HZ and VIRT_TIMER are disabled default_idle won't load
an enabled wait psw and busy loop instead. This is because the
idle_chain is empty and the return value of atomic_notifier_call_chain
will be NOTIFY_DONE, which causes default_idle to return instead of
loading an enabled wait psw.
Fix this by calling __atomic_notifier_call_chain instead and add proper
return value handling.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
上级 057c5cb3
......@@ -114,24 +114,27 @@ extern void s390_handle_mcck(void);
static void default_idle(void)
{
int cpu, rc;
int nr_calls = 0;
void *hcpu;
#ifdef CONFIG_SMP
struct s390_idle_data *idle;
#endif
/* CPU is going idle. */
cpu = smp_processor_id();
hcpu = (void *)(long)cpu;
local_irq_disable();
if (need_resched()) {
local_irq_enable();
return;
}
rc = atomic_notifier_call_chain(&idle_chain,
S390_CPU_IDLE, (void *)(long) cpu);
if (rc != NOTIFY_OK && rc != NOTIFY_DONE)
BUG();
if (rc != NOTIFY_OK) {
rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1,
&nr_calls);
if (rc == NOTIFY_BAD) {
nr_calls--;
__atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
hcpu, nr_calls, NULL);
local_irq_enable();
return;
}
......
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