ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/kernel/rcu/tiny.c b/marvell/linux/kernel/rcu/tiny.c
new file mode 100644
index 0000000..477b4eb
--- /dev/null
+++ b/marvell/linux/kernel/rcu/tiny.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Author: Paul E. McKenney <paulmck@linux.ibm.com>
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ * Documentation/RCU
+ */
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/rcupdate_wait.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/cpu.h>
+#include <linux/prefetch.h>
+
+#include "rcu.h"
+
+/* Global control variables for rcupdate callback mechanism. */
+struct rcu_ctrlblk {
+ struct rcu_head *rcucblist; /* List of pending callbacks (CBs). */
+ struct rcu_head **donetail; /* ->next pointer of last "done" CB. */
+ struct rcu_head **curtail; /* ->next pointer of last CB. */
+};
+
+/* Definition for rcupdate control block. */
+static struct rcu_ctrlblk rcu_ctrlblk = {
+ .donetail = &rcu_ctrlblk.rcucblist,
+ .curtail = &rcu_ctrlblk.rcucblist,
+};
+
+void rcu_barrier(void)
+{
+ wait_rcu_gp(call_rcu);
+}
+EXPORT_SYMBOL(rcu_barrier);
+
+/* Record an rcu quiescent state. */
+void rcu_qs(void)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (rcu_ctrlblk.donetail != rcu_ctrlblk.curtail) {
+ rcu_ctrlblk.donetail = rcu_ctrlblk.curtail;
+ raise_softirq_irqoff(RCU_SOFTIRQ);
+ }
+ local_irq_restore(flags);
+}
+
+/*
+ * Check to see if the scheduling-clock interrupt came from an extended
+ * quiescent state, and, if so, tell RCU about it. This function must
+ * be called from hardirq context. It is normally called from the
+ * scheduling-clock interrupt.
+ */
+void rcu_sched_clock_irq(int user)
+{
+ if (user) {
+ rcu_qs();
+ } else if (rcu_ctrlblk.donetail != rcu_ctrlblk.curtail) {
+ set_tsk_need_resched(current);
+ set_preempt_need_resched();
+ }
+}
+
+/* Invoke the RCU callbacks whose grace period has elapsed. */
+static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused)
+{
+ struct rcu_head *next, *list;
+ unsigned long flags;
+
+ /* Move the ready-to-invoke callbacks to a local list. */
+ local_irq_save(flags);
+ if (rcu_ctrlblk.donetail == &rcu_ctrlblk.rcucblist) {
+ /* No callbacks ready, so just leave. */
+ local_irq_restore(flags);
+ return;
+ }
+ list = rcu_ctrlblk.rcucblist;
+ rcu_ctrlblk.rcucblist = *rcu_ctrlblk.donetail;
+ *rcu_ctrlblk.donetail = NULL;
+ if (rcu_ctrlblk.curtail == rcu_ctrlblk.donetail)
+ rcu_ctrlblk.curtail = &rcu_ctrlblk.rcucblist;
+ rcu_ctrlblk.donetail = &rcu_ctrlblk.rcucblist;
+ local_irq_restore(flags);
+
+ /* Invoke the callbacks on the local list. */
+ while (list) {
+ next = list->next;
+ prefetch(next);
+ debug_rcu_head_unqueue(list);
+ local_bh_disable();
+ __rcu_reclaim("", list);
+ local_bh_enable();
+ list = next;
+ }
+}
+
+/*
+ * Wait for a grace period to elapse. But it is illegal to invoke
+ * synchronize_rcu() from within an RCU read-side critical section.
+ * Therefore, any legal call to synchronize_rcu() is a quiescent
+ * state, and so on a UP system, synchronize_rcu() need do nothing.
+ * (But Lai Jiangshan points out the benefits of doing might_sleep()
+ * to reduce latency.)
+ *
+ * Cool, huh? (Due to Josh Triplett.)
+ */
+void synchronize_rcu(void)
+{
+ RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) ||
+ lock_is_held(&rcu_lock_map) ||
+ lock_is_held(&rcu_sched_lock_map),
+ "Illegal synchronize_rcu() in RCU read-side critical section");
+}
+EXPORT_SYMBOL_GPL(synchronize_rcu);
+
+/*
+ * Post an RCU callback to be invoked after the end of an RCU grace
+ * period. But since we have but one CPU, that would be after any
+ * quiescent state.
+ */
+void call_rcu(struct rcu_head *head, rcu_callback_t func)
+{
+ unsigned long flags;
+
+ debug_rcu_head_queue(head);
+ head->func = func;
+ head->next = NULL;
+
+ local_irq_save(flags);
+ *rcu_ctrlblk.curtail = head;
+ rcu_ctrlblk.curtail = &head->next;
+ local_irq_restore(flags);
+
+ if (unlikely(is_idle_task(current))) {
+ /* force scheduling for rcu_qs() */
+ resched_cpu(0);
+ }
+}
+EXPORT_SYMBOL_GPL(call_rcu);
+
+void __init rcu_init(void)
+{
+ open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+ rcu_early_boot_tests();
+ srcu_init();
+}