padata: cpu hotplug code should depend on CONFIG_HOTPLUG_CPU

This patch makes the padata cpu hotplug code dependend on CONFIG_HOTPLUG_CPU.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 6 deletions

diff --git a/kernel/padata.c b/kernel/padata.c
index 5b44d0fa358e..1209a17b9718 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -570,6 +570,7 @@ void padata_stop(struct padata_instance *pinst)
 }
 EXPORT_SYMBOL(padata_stop);
 
+#ifdef CONFIG_HOTPLUG_CPU
 static int padata_cpu_callback(struct notifier_block *nfb,
                                unsigned long action, void *hcpu)
 {
@@ -621,6 +622,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 
         return NOTIFY_OK;
 }
+#endif
 
 /*
  * padata_alloc - allocate and initialize a padata instance
@@ -631,7 +633,6 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 struct padata_instance *padata_alloc(const struct cpumask *cpumask,
                                      struct workqueue_struct *wq)
 {
-        int err;
         struct padata_instance *pinst;
         struct parallel_data *pd;
 
@@ -654,18 +655,16 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
 
         pinst->flags = 0;
 
+#ifdef CONFIG_HOTPLUG_CPU
         pinst->cpu_notifier.notifier_call = padata_cpu_callback;
         pinst->cpu_notifier.priority = 0;
-        err = register_hotcpu_notifier(&pinst->cpu_notifier);
-        if (err)
-                goto err_free_cpumask;
+        register_hotcpu_notifier(&pinst->cpu_notifier);
+#endif
 
         mutex_init(&pinst->lock);
 
         return pinst;
 
-err_free_cpumask:
-        free_cpumask_var(pinst->cpumask);
 err_free_pd:
         padata_free_pd(pd);
 err_free_inst:
@@ -689,7 +688,9 @@ void padata_free(struct padata_instance *pinst)
         while (atomic_read(&pinst->pd->refcnt) != 0)
                 yield();
 
+#ifdef CONFIG_HOTPLUG_CPU
         unregister_hotcpu_notifier(&pinst->cpu_notifier);
+#endif
         padata_free_pd(pinst->pd);
         free_cpumask_var(pinst->cpumask);
         kfree(pinst);