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cpu: Remove try_get_online_cpus()

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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Paul E. McKenney 2015-08-07 15:14:30 -07:00
parent 807226e2fb
commit 02ef3c4a2a
2 changed files with 0 additions and 15 deletions
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2
include/linux/cpu.h
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@ -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)

13
kernel/cpu.c
View file

@ -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;