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Commit 02ef3c4a authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

cpu: Remove try_get_online_cpus() 



Now that synchronize_sched_expedited() no longer uses it, there are
no users of try_get_online_cpus() in mainline.  This commit therefore
removes it.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
parent 807226e2

include/linux/cpu.h

+0 −2
Original line number Original line Diff line number Diff line
@@ -228,7 +228,6 @@ extern struct bus_type cpu_subsys; 
extern void cpu_hotplug_begin(void);

extern void cpu_hotplug_begin(void);

extern void cpu_hotplug_done(void);

extern void cpu_hotplug_done(void);

extern void get_online_cpus(void);

extern void get_online_cpus(void);

extern bool try_get_online_cpus(void);

extern void put_online_cpus(void);

extern void put_online_cpus(void);

extern void cpu_hotplug_disable(void);

extern void cpu_hotplug_disable(void);

extern void cpu_hotplug_enable(void);

extern void cpu_hotplug_enable(void);
@@ -246,7 +245,6 @@ int cpu_down(unsigned int cpu); 
static inline void cpu_hotplug_begin(void) {}

static inline void cpu_hotplug_begin(void) {}

static inline void cpu_hotplug_done(void) {}

static inline void cpu_hotplug_done(void) {}

#define get_online_cpus()	do { } while (0)

#define get_online_cpus()	do { } while (0)

#define try_get_online_cpus()	true

#define put_online_cpus()	do { } while (0)

#define put_online_cpus()	do { } while (0)

#define cpu_hotplug_disable()	do { } while (0)

#define cpu_hotplug_disable()	do { } while (0)

#define cpu_hotplug_enable()	do { } while (0)

#define cpu_hotplug_enable()	do { } while (0)

kernel/cpu.c

+0 −13
Original line number Original line Diff line number Diff line
@@ -102,19 +102,6 @@ void get_online_cpus(void) 
}

}

EXPORT_SYMBOL_GPL(get_online_cpus);

EXPORT_SYMBOL_GPL(get_online_cpus);





bool try_get_online_cpus(void)

{

	if (cpu_hotplug.active_writer == current)

		return true;

	if (!mutex_trylock(&cpu_hotplug.lock))

		return false;

	cpuhp_lock_acquire_tryread();

	atomic_inc(&cpu_hotplug.refcount);

	mutex_unlock(&cpu_hotplug.lock);

	return true;

}

EXPORT_SYMBOL_GPL(try_get_online_cpus);



void put_online_cpus(void)

void put_online_cpus(void)

{

{

	int refcount;

	int refcount;