Commit 46ac96fb authored by Qais Yousef's avatar Qais Yousef
Browse files

cpu: Hide cpu_up/down

Provide a special exported function for the device core to bring a cpu
up/down and hide the real cpu_up/down as they are treated as private
functions. cpu_up/down are lower level API and users outside the cpu
subsystem should use add/remove_cpu() which will take care of extra
housekeeping work like keeping sysfs in sync.
Signed-off-by: Qais Yousef's avatarQais Yousef <>
CC: Greg Kroah-Hartman <>
CC: "Rafael J. Wysocki" <>
CC: Thomas Gleixner <>
CC: Josh Poimboeuf <>
CC: Nicholas Piggin <>
CC: "Peter Zijlstra (Intel)" <>
CC: Jiri Kosina <>
CC: Daniel Lezcano <>
CC: Eiichi Tsukata <>
CC: Zhenzhong Duan <>
CC: Ingo Molnar <>
CC: Pavankumar Kondeti <>
parent 9675a23e
......@@ -55,7 +55,7 @@ static int cpu_subsys_online(struct device *dev)
if (from_nid == NUMA_NO_NODE)
return -ENODEV;
ret = cpu_up(cpuid);
ret = cpu_subsys_up(dev);
* When hot adding memory to memoryless node and enabling a cpu
* on the node, node number of the cpu may internally change.
......@@ -69,7 +69,7 @@ static int cpu_subsys_online(struct device *dev)
static int cpu_subsys_offline(struct device *dev)
return cpu_down(dev->id);
return cpu_subsys_down(dev);
void unregister_cpu(struct cpu *cpu)
......@@ -88,8 +88,8 @@ extern ssize_t arch_cpu_release(const char *, size_t);
extern bool cpuhp_tasks_frozen;
int cpu_up(unsigned int cpu);
int add_cpu(unsigned int cpu);
int cpu_subsys_up(struct device *dev);
void notify_cpu_starting(unsigned int cpu);
extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);
......@@ -120,8 +120,8 @@ extern void lockdep_assert_cpus_held(void);
extern void cpu_hotplug_disable(void);
extern void cpu_hotplug_enable(void);
void clear_tasks_mm_cpumask(int cpu);
int cpu_down(unsigned int cpu);
int remove_cpu(unsigned int cpu);
int cpu_subsys_down(struct device *dev);
extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
......@@ -1051,11 +1051,23 @@ static int do_cpu_down(unsigned int cpu, enum cpuhp_state target)
return err;
int cpu_down(unsigned int cpu)
static int cpu_down(unsigned int cpu)
return do_cpu_down(cpu, CPUHP_OFFLINE);
* cpu_subsys_down - Bring down a cpu device
* @dev: Pointer to the cpu device to offline
* This function is meant to be used by device core cpu subsystem only.
* Other subsystems should use remove_cpu() instead.
int cpu_subsys_down(struct device *dev)
return cpu_down(dev->id);
int remove_cpu(unsigned int cpu)
......@@ -1257,11 +1269,23 @@ out:
return err;
int cpu_up(unsigned int cpu)
static int cpu_up(unsigned int cpu)
return do_cpu_up(cpu, CPUHP_ONLINE);
* cpu_subsys_up - Bring up a cpu device
* @dev: Pointer to the cpu device to online
* This function is meant to be used by device core cpu subsystem only.
* Other subsystems should use add_cpu() instead.
int cpu_subsys_up(struct device *dev)
return cpu_up(dev->id);
int add_cpu(unsigned int cpu)
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