Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 23717ee..fa35dcf 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -9,6 +9,7 @@
#ifndef PADATA_H
#define PADATA_H
+#include <linux/compiler_types.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/list.h>
@@ -98,7 +99,7 @@
* struct parallel_data - Internal control structure, covers everything
* that depends on the cpumask in use.
*
- * @pinst: padata instance.
+ * @sh: padata_shell object.
* @pqueue: percpu padata queues used for parallelization.
* @squeue: percpu padata queues used for serialuzation.
* @reorder_objects: Number of objects waiting in the reorder queues.
@@ -111,7 +112,7 @@
* @lock: Reorder lock.
*/
struct parallel_data {
- struct padata_instance *pinst;
+ struct padata_shell *ps;
struct padata_parallel_queue __percpu *pqueue;
struct padata_serial_queue __percpu *squeue;
atomic_t reorder_objects;
@@ -125,13 +126,33 @@
};
/**
+ * struct padata_shell - Wrapper around struct parallel_data, its
+ * purpose is to allow the underlying control structure to be replaced
+ * on the fly using RCU.
+ *
+ * @pinst: padat instance.
+ * @pd: Actual parallel_data structure which may be substituted on the fly.
+ * @opd: Pointer to old pd to be freed by padata_replace.
+ * @list: List entry in padata_instance list.
+ */
+struct padata_shell {
+ struct padata_instance *pinst;
+ struct parallel_data __rcu *pd;
+ struct parallel_data *opd;
+ struct list_head list;
+};
+
+/**
* struct padata_instance - The overall control structure.
*
- * @cpu_notifier: cpu hotplug notifier.
+ * @cpu_online_node: Linkage for CPU online callback.
+ * @cpu_dead_node: Linkage for CPU offline callback.
* @parallel_wq: The workqueue used for parallel work.
* @serial_wq: The workqueue used for serial work.
- * @pd: The internal control structure.
+ * @pslist: List of padata_shell objects attached to this instance.
* @cpumask: User supplied cpumasks for parallel and serial works.
+ * @rcpumask: Actual cpumasks based on user cpumask and cpu_online_mask.
+ * @omask: Temporary storage used to compute the notification mask.
* @cpumask_change_notifier: Notifiers chain for user-defined notify
* callbacks that will be called when either @pcpu or @cbcpu
* or both cpumasks change.
@@ -140,11 +161,14 @@
* @flags: padata flags.
*/
struct padata_instance {
- struct hlist_node node;
+ struct hlist_node cpu_online_node;
+ struct hlist_node cpu_dead_node;
struct workqueue_struct *parallel_wq;
struct workqueue_struct *serial_wq;
- struct parallel_data *pd;
+ struct list_head pslist;
struct padata_cpumask cpumask;
+ struct padata_cpumask rcpumask;
+ cpumask_var_t omask;
struct blocking_notifier_head cpumask_change_notifier;
struct kobject kobj;
struct mutex lock;
@@ -156,7 +180,9 @@
extern struct padata_instance *padata_alloc_possible(const char *name);
extern void padata_free(struct padata_instance *pinst);
-extern int padata_do_parallel(struct padata_instance *pinst,
+extern struct padata_shell *padata_alloc_shell(struct padata_instance *pinst);
+extern void padata_free_shell(struct padata_shell *ps);
+extern int padata_do_parallel(struct padata_shell *ps,
struct padata_priv *padata, int *cb_cpu);
extern void padata_do_serial(struct padata_priv *padata);
extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,