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| 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 /kernel/softirq.c | |
| parent | mm/writeback: Convert to hotplug state machine (diff) | |
| download | linux-c4544dbc7a9bce3da6fa2361cd68cadb34e9221f.tar.xz linux-c4544dbc7a9bce3da6fa2361cd68cadb34e9221f.zip | |
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>
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 27 |
1 files changed, 6 insertions, 21 deletions
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; |