diff options
| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-02-19 15:29:26 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-19 15:29:33 +0100 |
| commit | 11ab244c9faead91683a12e4cb10d26b279bb4aa (patch) | |
| tree | 73f5498f5de7a81e1337aa1349f2d5db8a115376 /arch/s390 | |
| parent | [S390] Let NR_CPUS default to 32/64 on s390/s390x. (diff) | |
| download | linux-dev-11ab244c9faead91683a12e4cb10d26b279bb4aa.tar.xz linux-dev-11ab244c9faead91683a12e4cb10d26b279bb4aa.zip | |
[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')
| -rw-r--r-- | arch/s390/kernel/process.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index a6a4729e0e94..1c59ec161cf8 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; } |