intel_pstate_init(...)
	...cpufreq_online(...)
		down_write(&policy->rwsem);
		...
		cpufreq_init_policy(policy);
			...intel_pstate_hwp_set();
				get_online_cpus(); // Temporarily locks cpu_hotplug.lock
		...
		up_write(&policy->rwsem);

pm_suspend(...)
	...disable_nonboot_cpus()
		_cpu_down()
			cpu_hotplug_begin(); // Locks cpu_hotplug.lock
			__cpu_notify(CPU_DOWN_PREPARE, ...);
				...cpufreq_offline_prepare();
					down_write(&policy->rwsem); // Locks policy->rwsem

FULL TRACE FOR P-STATE INIT

get_online_cpus+0x90/0xa0
? get_online_cpus+0x2d/0xa0
intel_pstate_hwp_set+0x40/0x150
intel_pstate_set_policy+0x135/0x170
cpufreq_set_policy+0xdb/0x3f0
cpufreq_init_policy+0x6a/0xc0
? cpufreq_update_policy+0x1e0/0x1e0
cpufreq_online+0x314/0xad0
cpufreq_add_dev+0x5a/0x80
subsys_interface_register+0xa7/0xf0
? _raw_write_unlock_irqrestore+0x3d/0x60
cpufreq_register_driver+0x147/0x210
intel_pstate_init+0x35b/0x481
? cpufreq_gov_dbs_init+0x12/0x12
do_one_initcall+0xa6/0x1d0
kernel_init_freeable+0x113/0x199
? rest_init+0x140/0x140
kernel_init+0x9/0xe0
ret_from_fork+0x3f/0x70
? rest_init+0x140/0x140

FULL TRACE FOR SUSPEND

lock_acquire+0xc3/0x1d0
? cpufreq_offline_prepare+0x92/0x2d0
down_write+0x3f/0x70
? cpufreq_offline_prepare+0x92/0x2d0
cpufreq_offline_prepare+0x92/0x2d0
cpufreq_cpu_callback+0x45/0x50
notifier_call_chain+0x39/0xa0
__raw_notifier_call_chain+0x9/0x10
_cpu_down+0x9e/0x330
? vprintk_emit+0x2cb/0x610
? vprintk_emit+0x324/0x610
? vprintk_default+0x1a/0x20
disable_nonboot_cpus+0xc0/0x350
suspend_devices_and_enter+0x409/0xb30
pm_suspend+0x53f/0x8c0
state_store+0x77/0xe0
kobj_attr_store+0xf/0x20
sysfs_kf_write+0x40/0x50
kernfs_fop_write+0x13c/0x180
__vfs_write+0x23/0xe0
? percpu_down_read+0x52/0x90
? __sb_start_write+0xb2/0xf0
? __sb_start_write+0xb2/0xf0
vfs_write+0xa2/0x190
? __fget_light+0x6a/0x90
SyS_write+0x44/0xb0
entry_SYSCALL_64_fastpath+0x16/0x73

# EOF