diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-08-18 14:57:21 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-06 18:30:22 +0200 |
| commit | c4544dbc7a9bce3da6fa2361cd68cadb34e9221f (patch) | |
| tree | 6bb7fa3a00640539aac7948ee0d26e47f488787b | |
| parent | 1d7ac6aec947d222042b6d22b3cec109db4fd19e (diff) | |
kernel/softirq: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160818125731.27256-7-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | include/linux/cpuhotplug.h | 1 | ||||
| -rw-r--r-- | kernel/softirq.c | 27 |
2 files changed, 7 insertions, 21 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 854e59a426d4..a421407a317f 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -17,6 +17,7 @@ enum cpuhp_state { CPUHP_VIRT_NET_DEAD, CPUHP_SLUB_DEAD, CPUHP_MM_WRITEBACK_DEAD, + CPUHP_SOFTIRQ_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, diff --git a/kernel/softirq.c b/kernel/softirq.c index 17caf4b63342..c372114494f5 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -700,7 +700,7 @@ void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu) BUG(); } -static void takeover_tasklets(unsigned int cpu) +static int takeover_tasklets(unsigned int cpu) { /* CPU is dead, so no lock needed. */ local_irq_disable(); @@ -723,27 +723,12 @@ static void takeover_tasklets(unsigned int cpu) raise_softirq_irqoff(HI_SOFTIRQ); local_irq_enable(); + return 0; } +#else +#define takeover_tasklets NULL #endif /* CONFIG_HOTPLUG_CPU */ -static int cpu_callback(struct notifier_block *nfb, unsigned long action, - void *hcpu) -{ - switch (action) { -#ifdef CONFIG_HOTPLUG_CPU - case CPU_DEAD: - case CPU_DEAD_FROZEN: - takeover_tasklets((unsigned long)hcpu); - break; -#endif /* CONFIG_HOTPLUG_CPU */ - } - return NOTIFY_OK; -} - -static struct notifier_block cpu_nfb = { - .notifier_call = cpu_callback -}; - static struct smp_hotplug_thread softirq_threads = { .store = &ksoftirqd, .thread_should_run = ksoftirqd_should_run, @@ -753,8 +738,8 @@ static struct smp_hotplug_thread softirq_threads = { static __init int spawn_ksoftirqd(void) { - register_cpu_notifier(&cpu_nfb); - + cpuhp_setup_state_nocalls(CPUHP_SOFTIRQ_DEAD, "softirq:dead", NULL, + takeover_tasklets); BUG_ON(smpboot_register_percpu_thread(&softirq_threads)); return 0; |