int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus) { int ret; ret = stop_machine_create(); if (ret) return ret; /* No CPUs can come up or down during this. */ get_online_cpus(); ret = __stop_machine(fn, data, cpus); put_online_cpus(); stop_machine_destroy(); return ret; }
static void do_suspend(void) { int err; int cancelled = 1; shutting_down = SHUTDOWN_SUSPEND; err = stop_machine_create(); if (err) { printk(KERN_ERR "xen suspend: failed to setup stop_machine %d\n", err); goto out; } #ifdef CONFIG_PREEMPT /* If the kernel is preemptible, we need to freeze all the processes to prevent them from being in the middle of a pagetable update during suspend. */ err = freeze_processes(); if (err) { printk(KERN_ERR "xen suspend: freeze failed %d\n", err); goto out_destroy_sm; } #endif err = dpm_suspend_start(PMSG_SUSPEND); if (err) { printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err); goto out_thaw; } printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); err = dpm_suspend_noirq(PMSG_SUSPEND); if (err) { printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err); goto out_resume; } err = stop_machine(xen_suspend, &cancelled, cpumask_of(0)); dpm_resume_noirq(PMSG_RESUME); if (err) { printk(KERN_ERR "failed to start xen_suspend: %d\n", err); cancelled = 1; } out_resume: if (!cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(PMSG_RESUME); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); out_thaw: #ifdef CONFIG_PREEMPT thaw_processes(); out_destroy_sm: #endif stop_machine_destroy(); out: shutting_down = SHUTDOWN_INVALID; }