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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 23c30bdcca8631f80242d62d4b167d20e2814c75..d2ca8c38f9c45c0b279ef329c7abf130fcd0dc61 100644 (file)
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -228,7 +228,6 @@ extern struct bus_type cpu_subsys;
 extern void cpu_hotplug_begin(void);
 extern void cpu_hotplug_done(void);
 extern void get_online_cpus(void);
-extern bool try_get_online_cpus(void);
 extern void put_online_cpus(void);
 extern void cpu_hotplug_disable(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_done(void) {}
 #define get_online_cpus()      do { } while (0)
-#define try_get_online_cpus()  true
 #define put_online_cpus()      do { } while (0)
 #define cpu_hotplug_disable()  do { } while (0)
 #define cpu_hotplug_enable()   do { } while (0)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 82cf9dff4295eaa82305fe04a43cecb0c8a4c27e..14a9cdf8abe9e806083ca3041c2861f6ef0713b3 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -102,19 +102,6 @@ void get_online_cpus(void)
 }
 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)
 {
        int refcount;