padata: Pass the padata cpumasks to the cpumask_change_notifier chain

We pass a pointer to the new padata cpumasks to the cpumask_change_notifier
chain. So users can access the cpumasks without the need of an extra
padata_get_cpumask function.

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

2 files changed, 23 insertions, 20 deletions

diff --git a/include/linux/padata.h b/include/linux/padata.h
index bb0fc5dd0bbb..43db792f44dd 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -98,6 +98,16 @@ struct padata_parallel_queue {
        int                   cpu_index;
 };
 
+/**
+ * struct padata_cpumask - The cpumasks for the parallel/serial workers
+ *
+ * @pcpu: cpumask for the parallel workers.
+ * @cbcpu: cpumask for the serial (callback) workers.
+ */
+struct padata_cpumask {
+        cpumask_var_t   pcpu;
+        cpumask_var_t   cbcpu;
+};
 
 /**
  * struct parallel_data - Internal control structure, covers everything
@@ -110,8 +120,7 @@ struct padata_parallel_queue {
  * @reorder_objects: Number of objects waiting in the reorder queues.
  * @refcnt: Number of objects holding a reference on this parallel_data.
  * @max_seq_nr:  Maximal used sequence number.
- * @cpumask: Contains two cpumasks: pcpu and cbcpu for
- *           parallel and serial workers respectively.
+ * @cpumask: The cpumasks in use for parallel and serial workers.
  * @lock: Reorder lock.
  * @processed: Number of already processed objects.
  * @timer: Reorder timer.
@@ -120,17 +129,14 @@ struct parallel_data {
         struct padata_instance          *pinst;
         struct padata_parallel_queue    *pqueue;
         struct padata_serial_queue      *squeue;
-        atomic_t                         seq_nr;
-        atomic_t                         reorder_objects;
-        atomic_t                         refcnt;
-        unsigned int                     max_seq_nr;
-        struct {
-                cpumask_var_t            pcpu;
-                cpumask_var_t            cbcpu;
-        } cpumask;
-        spinlock_t                       lock ____cacheline_aligned;
-        unsigned int                     processed;
-        struct timer_list                timer;
+        atomic_t                        seq_nr;
+        atomic_t                        reorder_objects;
+        atomic_t                        refcnt;
+        unsigned int                    max_seq_nr;
+        struct padata_cpumask           cpumask;
+        spinlock_t                      lock ____cacheline_aligned;
+        unsigned int                    processed;
+        struct timer_list               timer;
 };
 
 /**
@@ -139,8 +145,7 @@ struct parallel_data {
  * @cpu_notifier: cpu hotplug notifier.
  * @wq: The workqueue in use.
  * @pd: The internal control structure.
- * @cpumask: User supplied cpumask. Contains two cpumasks: pcpu and
- *           cbcpu for parallel and serial works respectivly.
+ * @cpumask: User supplied cpumasks for parallel and serial works.
  * @cpumask_change_notifier: Notifiers chain for user-defined notify
  *            callbacks that will be called when either @pcpu or @cbcpu
  *            or both cpumasks change.
@@ -152,10 +157,7 @@ struct padata_instance {
         struct notifier_block            cpu_notifier;
         struct workqueue_struct         *wq;
         struct parallel_data            *pd;
-        struct {
-                cpumask_var_t            pcpu;
-                cpumask_var_t            cbcpu;
-        } cpumask;
+        struct padata_cpumask           cpumask;
         struct blocking_notifier_head    cpumask_change_notifier;
         struct kobject                   kobj;
         struct mutex                     lock;
diff --git a/kernel/padata.c b/kernel/padata.c
index 4987203770bc..1c8c1d1d301d 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -538,7 +538,8 @@ static void padata_replace(struct padata_instance *pinst,
 
         if (notification_mask)
                 blocking_notifier_call_chain(&pinst->cpumask_change_notifier,
-                                             notification_mask, pinst);
+                                             notification_mask,
+                                             &pd_new->cpumask);
 
         pinst->flags &= ~PADATA_RESET;
 }