stop_machine: Unexport __stop_machine()

The only caller outside of stop_machine.c is _cpu_down(), it can use
stop_machine(). get_online_cpus() is fine under cpu_hotplug_begin().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: viro@ZenIV.linux.org.uk
Link: http://lkml.kernel.org/r/20150630012951.GA23934@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index d2abbdb..0fca276 100644 (file)
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -114,23 +114,11 @@ static inline int try_stop_cpus(const struct cpumask *cpumask,
  * grabbing every spinlock in the kernel. */
 int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
 
-/**
- * __stop_machine: freeze the machine on all CPUs and run this function
- * @fn: the function to run
- * @data: the data ptr for the @fn
- * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
- *
- * Description: This is a special version of the above, which assumes cpus
- * won't come or go while it's being called.  Used by hotplug cpu.
- */
-int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
-
 int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
                                   const struct cpumask *cpus);
-
 #else   /* CONFIG_STOP_MACHINE && CONFIG_SMP */
 
-static inline int __stop_machine(int (*fn)(void *), void *data,
+static inline int stop_machine(int (*fn)(void *), void *data,
                                 const struct cpumask *cpus)
 {
        unsigned long flags;
@@ -141,16 +129,10 @@ static inline int __stop_machine(int (*fn)(void *), void *data,
        return ret;
 }
 
-static inline int stop_machine(int (*fn)(void *), void *data,
-                              const struct cpumask *cpus)
-{
-       return __stop_machine(fn, data, cpus);
-}
-
 static inline int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
                                                 const struct cpumask *cpus)
 {
-       return __stop_machine(fn, data, cpus);
+       return stop_machine(fn, data, cpus);
 }
 
 #endif /* CONFIG_STOP_MACHINE && CONFIG_SMP */

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 9c9c9fa..664ce52 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -395,7 +395,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
         * So now all preempt/rcu users must observe !cpu_active().
         */
 
-       err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
+       err = stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
        if (err) {
                /* CPU didn't die: tell everyone.  Can't complain. */
                cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 6212208..b50910d 100644 (file)
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -513,7 +513,7 @@ early_initcall(cpu_stop_init);
 
 #ifdef CONFIG_STOP_MACHINE
 
-int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
+static int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
 {
        struct multi_stop_data msdata = {
                .fn = fn,