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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-02-19 15:29:26 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-19 15:29:33 +0100
commit11ab244c9faead91683a12e4cb10d26b279bb4aa (patch)
tree73f5498f5de7a81e1337aa1349f2d5db8a115376 /arch/s390/kernel/process.c
parent057c5cb35ece6ae3a4c2cb849f3948c5ad6add32 (diff)
[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: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/process.c')
-rw-r--r--arch/s390/kernel/process.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index a6a4729e0e9..1c59ec161cf 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -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;
}