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-rw-r--r--include/linux/smpboot.h4
-rw-r--r--kernel/smpboot.c2
-rw-r--r--kernel/stop_machine.c2
3 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/smpboot.h b/include/linux/smpboot.h
index c65dee0..13e9296 100644
--- a/include/linux/smpboot.h
+++ b/include/linux/smpboot.h
@@ -24,6 +24,9 @@ struct smpboot_thread_data;
* parked (cpu offline)
* @unpark: Optional unpark function, called when the thread is
* unparked (cpu online)
+ * @pre_unpark: Optional unpark function, called before the thread is
+ * unparked (cpu online). This is not guaranteed to be
+ * called on the target cpu of the thread. Careful!
* @selfparking: Thread is not parked by the park function.
* @thread_comm: The base name of the thread
*/
@@ -37,6 +40,7 @@ struct smp_hotplug_thread {
void (*cleanup)(unsigned int cpu, bool online);
void (*park)(unsigned int cpu);
void (*unpark)(unsigned int cpu);
+ void (*pre_unpark)(unsigned int cpu);
bool selfparking;
const char *thread_comm;
};
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index d4abac2..8eaed9a 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -209,6 +209,8 @@ static void smpboot_unpark_thread(struct smp_hotplug_thread *ht, unsigned int cp
{
struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
+ if (ht->pre_unpark)
+ ht->pre_unpark(cpu);
kthread_unpark(tsk);
}
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 95d178c..c09f295 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -336,7 +336,7 @@ static struct smp_hotplug_thread cpu_stop_threads = {
.create = cpu_stop_create,
.setup = cpu_stop_unpark,
.park = cpu_stop_park,
- .unpark = cpu_stop_unpark,
+ .pre_unpark = cpu_stop_unpark,
.selfparking = true,
};
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