cpu/hotplug: Document states better (d10ef6f9) · Commits · e / devices / android_kernel_oneplus_sm8150

kernel/cpu.c

+46 −1

Original line number	Diff line number	Diff line
		@@ -1172,6 +1172,10 @@ static struct cpuhp_step cpuhp_bp_states[] = {
		.teardown = NULL,
		.cant_stop = true,
		},
		/*
		* Preparatory and dead notifiers. Will be replaced once the notifiers
		* are converted to states.
		*/
		[CPUHP_NOTIFY_PREPARE] = {
		.name = "notify:prepare",
		.startup = notify_prepare,
		@@ -1179,12 +1183,17 @@ static struct cpuhp_step cpuhp_bp_states[] = {
		.skip_onerr = true,
		.cant_stop = true,
		},
		/* Kicks the plugged cpu into life */
		[CPUHP_BRINGUP_CPU] = {
		.name = "cpu:bringup",
		.startup = bringup_cpu,
		.teardown = NULL,
		.cant_stop = true,
		},
		/*
		* Handled on controll processor until the plugged processor manages
		* this itself.
		*/
		[CPUHP_TEARDOWN_CPU] = {
		.name = "cpu:teardown",
		.startup = NULL,
		@@ -1197,6 +1206,23 @@ static struct cpuhp_step cpuhp_bp_states[] = {
		/* Application processor state steps */
		static struct cpuhp_step cpuhp_ap_states[] = {
		#ifdef CONFIG_SMP
		/* Final state before CPU kills itself */
		[CPUHP_AP_IDLE_DEAD] = {
		.name = "idle:dead",
		},
		/*
		* Last state before CPU enters the idle loop to die. Transient state
		* for synchronization.
		*/
		[CPUHP_AP_OFFLINE] = {
		.name = "ap:offline",
		.cant_stop = true,
		},
		/*
		* Low level startup/teardown notifiers. Run with interrupts
		* disabled. Will be removed once the notifiers are converted to
		* states.
		*/
		[CPUHP_AP_NOTIFY_STARTING] = {
		.name = "notify:starting",
		.startup = notify_starting,
		@@ -1204,17 +1230,32 @@ static struct cpuhp_step cpuhp_ap_states[] = {
		.skip_onerr = true,
		.cant_stop = true,
		},
		/* Entry state on starting. Interrupts enabled from here on. Transient
		* state for synchronsization */
		[CPUHP_AP_ONLINE] = {
		.name = "ap:online",
		},
		/* Handle smpboot threads park/unpark */
		[CPUHP_AP_SMPBOOT_THREADS] = {
		.name = "smpboot:threads",
		.startup = smpboot_unpark_threads,
		.teardown = NULL,
		},
		/*
		* Online/down_prepare notifiers. Will be removed once the notifiers
		* are converted to states.
		*/
		[CPUHP_AP_NOTIFY_ONLINE] = {
		.name = "notify:online",
		.startup = notify_online,
		.teardown = notify_down_prepare,
		},
		#endif
		/*
		* The dynamically registered state space is here
		*/

		/* CPU is fully up and running. */
		[CPUHP_ONLINE] = {
		.name = "online",
		.startup = NULL,
		@@ -1232,7 +1273,11 @@ static int cpuhp_cb_check(enum cpuhp_state state)

		static bool cpuhp_is_ap_state(enum cpuhp_state state)
		{
		return state > CPUHP_BRINGUP_CPU;
		/*
		* The extra check for CPUHP_TEARDOWN_CPU is only for documentation
		* purposes as that state is handled explicitely in cpu_down.
		*/
		return state > CPUHP_BRINGUP_CPU && state != CPUHP_TEARDOWN_CPU;
		}

		static struct cpuhp_step *cpuhp_get_step(enum cpuhp_state state)