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| author | Thomas Gleixner <tglx@linutronix.de> | 2013-03-21 22:49:57 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-04-08 17:39:27 +0200 |
| commit | 52c0065947b7f78a3d9808b421006a3d870d1f92 (patch) | |
| tree | b23f080c849b89c39b6c2ac3045ddf6d70466315 | |
| parent | 799fef06123f86ff69cf754f996219e6ad1678f8 (diff) | |
| download | linux-52c0065947b7f78a3d9808b421006a3d870d1f92.tar.bz2 | |
s390: Use generic idle loop
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Link: http://lkml.kernel.org/r/20130321215235.090816526@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/s390/Kconfig | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/process.c | 32 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 3 | ||||
| -rw-r--r-- | arch/s390/kernel/vtime.c | 5 |
4 files changed, 11 insertions, 30 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index eb8fb629f00b..749513d73e47 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -97,6 +97,7 @@ config S390 select CLONE_BACKWARDS2 select GENERIC_CLOCKEVENTS select GENERIC_CPU_DEVICES if !SMP + select GENERIC_IDLE_LOOP select GENERIC_KERNEL_THREAD select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL_OLD diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 536d64579d9a..2bc3eddae34a 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -61,18 +61,8 @@ unsigned long thread_saved_pc(struct task_struct *tsk) return sf->gprs[8]; } -/* - * The idle loop on a S390... - */ -static void default_idle(void) +void arch_cpu_idle(void) { - if (cpu_is_offline(smp_processor_id())) - cpu_die(); - local_irq_disable(); - if (need_resched()) { - local_irq_enable(); - return; - } local_mcck_disable(); if (test_thread_flag(TIF_MCCK_PENDING)) { local_mcck_enable(); @@ -83,19 +73,15 @@ static void default_idle(void) vtime_stop_cpu(); } -void cpu_idle(void) +void arch_cpu_idle_exit(void) { - for (;;) { - tick_nohz_idle_enter(); - rcu_idle_enter(); - while (!need_resched() && !test_thread_flag(TIF_MCCK_PENDING)) - default_idle(); - rcu_idle_exit(); - tick_nohz_idle_exit(); - if (test_thread_flag(TIF_MCCK_PENDING)) - s390_handle_mcck(); - schedule_preempt_disabled(); - } + if (test_thread_flag(TIF_MCCK_PENDING)) + s390_handle_mcck(); +} + +void arch_cpu_idle_dead(void) +{ + cpu_die(); } extern void __kprobes kernel_thread_starter(void); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 549c9d173c0f..6ff5845679e6 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -711,8 +711,7 @@ static void __cpuinit smp_start_secondary(void *cpuvoid) set_cpu_online(smp_processor_id(), true); inc_irq_stat(CPU_RST); local_irq_enable(); - /* cpu_idle will call schedule for us */ - cpu_idle(); + cpu_startup_entry(CPUHP_ONLINE); } /* Upping and downing of CPUs */ diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index a0042acbd989..3fb09359eda6 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -158,8 +158,6 @@ void __kprobes vtime_stop_cpu(void) unsigned long psw_mask; trace_hardirqs_on(); - /* Don't trace preempt off for idle. */ - stop_critical_timings(); /* Wait for external, I/O or machine check interrupt. */ psw_mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_DAT | @@ -169,9 +167,6 @@ void __kprobes vtime_stop_cpu(void) /* Call the assembler magic in entry.S */ psw_idle(idle, psw_mask); - /* Reenable preemption tracer. */ - start_critical_timings(); - /* Account time spent with enabled wait psw loaded as idle time. */ idle->sequence++; smp_wmb(); |