stop_machine: Use 'cpu_stop_fn_t' where possible

Cosmetic, but 'cpu_stop_fn_t' actually makes the code more readable and
it doesn't break cscope. And most of the declarations already use it.

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/20150630012955.GA23937@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 0fca276a05373e1ed9eb226426efaed176754c13..414d924318ce1ba57a448a485d8594a99a9012d5 100644 (file)
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -112,13 +112,13 @@ static inline int try_stop_cpus(const struct cpumask *cpumask,
  *
  * This can be thought of as a very heavy write lock, equivalent to
  * grabbing every spinlock in the kernel. */
-int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
+int stop_machine(cpu_stop_fn_t fn, void *data, const struct cpumask *cpus);
 
-int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
+int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, 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(cpu_stop_fn_t fn, void *data,
                                 const struct cpumask *cpus)
 {
        unsigned long flags;
@@ -129,7 +129,7 @@ static inline int stop_machine(int (*fn)(void *), void *data,
        return ret;
 }
 
-static inline int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
+static inline int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, void *data,
                                                 const struct cpumask *cpus)
 {
        return stop_machine(fn, data, cpus);

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index b50910dbf030621d6f2f411116b74e77c2c5d305..9a70defe9f1f3d097932082fade10ad737656c90 100644 (file)
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -141,7 +141,7 @@ enum multi_stop_state {
 };
 
 struct multi_stop_data {
-       int                     (*fn)(void *);
+       cpu_stop_fn_t           fn;
        void                    *data;
        /* Like num_online_cpus(), but hotplug cpu uses us, so we need this. */
        unsigned int            num_threads;
@@ -513,7 +513,7 @@ early_initcall(cpu_stop_init);
 
 #ifdef CONFIG_STOP_MACHINE
 
-static int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
+static int __stop_machine(cpu_stop_fn_t fn, void *data, const struct cpumask *cpus)
 {
        struct multi_stop_data msdata = {
                .fn = fn,
@@ -546,7 +546,7 @@ static int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *c
        return stop_cpus(cpu_online_mask, multi_cpu_stop, &msdata);
 }
 
-int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
+int stop_machine(cpu_stop_fn_t fn, void *data, const struct cpumask *cpus)
 {
        int ret;
 
@@ -580,7 +580,7 @@ EXPORT_SYMBOL_GPL(stop_machine);
  * 0 if all executions of @fn returned 0, any non zero return value if any
  * returned non zero.
  */
-int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
+int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, void *data,
                                  const struct cpumask *cpus)
 {
        struct multi_stop_data msdata = { .fn = fn, .data = data,