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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/kernel/rcu/rcu_segcblist.h
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@@ -1,37 +1,25 @@
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+/* SPDX-License-Identifier: GPL-2.0+ */
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 /*
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  * RCU segmented callback lists, internal-to-rcu header file
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  *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, you can access it online at
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- * http://www.gnu.org/licenses/gpl-2.0.html.
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- *
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  * Copyright IBM Corporation, 2017
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  *
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- * Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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+ * Authors: Paul E. McKenney <paulmck@linux.ibm.com>
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  */
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 #include <linux/rcu_segcblist.h>
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-/*
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- * Account for the fact that a previously dequeued callback turned out
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- * to be marked as lazy.
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- */
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-static inline void rcu_cblist_dequeued_lazy(struct rcu_cblist *rclp)
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+/* Return number of callbacks in the specified callback list. */
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+static inline long rcu_cblist_n_cbs(struct rcu_cblist *rclp)
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 {
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-	rclp->len_lazy--;
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+	return READ_ONCE(rclp->len);
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 }
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 void rcu_cblist_init(struct rcu_cblist *rclp);
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+void rcu_cblist_enqueue(struct rcu_cblist *rclp, struct rcu_head *rhp);
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+void rcu_cblist_flush_enqueue(struct rcu_cblist *drclp,
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+			      struct rcu_cblist *srclp,
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+			      struct rcu_head *rhp);
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 struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp);
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 /*
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@@ -49,34 +37,32 @@
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  */
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 static inline bool rcu_segcblist_empty(struct rcu_segcblist *rsclp)
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 {
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-	return !rsclp->head;
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+	return !READ_ONCE(rsclp->head);
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 }
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 /* Return number of callbacks in segmented callback list. */
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 static inline long rcu_segcblist_n_cbs(struct rcu_segcblist *rsclp)
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 {
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+#ifdef CONFIG_RCU_NOCB_CPU
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+	return atomic_long_read(&rsclp->len);
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+#else
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 	return READ_ONCE(rsclp->len);
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-}
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-
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-/* Return number of lazy callbacks in segmented callback list. */
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-static inline long rcu_segcblist_n_lazy_cbs(struct rcu_segcblist *rsclp)
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-{
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-	return rsclp->len_lazy;
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-}
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-
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-/* Return number of lazy callbacks in segmented callback list. */
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-static inline long rcu_segcblist_n_nonlazy_cbs(struct rcu_segcblist *rsclp)
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-{
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-	return rsclp->len - rsclp->len_lazy;
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+#endif
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 }
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 /*
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  * Is the specified rcu_segcblist enabled, for example, not corresponding
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- * to an offline or callback-offloaded CPU?
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+ * to an offline CPU?
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  */
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 static inline bool rcu_segcblist_is_enabled(struct rcu_segcblist *rsclp)
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 {
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-	return !!rsclp->tails[RCU_NEXT_TAIL];
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+	return rsclp->enabled;
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+}
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+
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+/* Is the specified rcu_segcblist offloaded?  */
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+static inline bool rcu_segcblist_is_offloaded(struct rcu_segcblist *rsclp)
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+{
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+	return rsclp->offloaded;
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 }
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 /*
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@@ -86,40 +72,22 @@
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  */
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 static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg)
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 {
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-	return !*rsclp->tails[seg];
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+	return !READ_ONCE(*READ_ONCE(rsclp->tails[seg]));
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 }
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-/*
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- * Interim function to return rcu_segcblist head pointer.  Longer term, the
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- * rcu_segcblist will be used more pervasively, removing the need for this
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- * function.
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- */
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-static inline struct rcu_head *rcu_segcblist_head(struct rcu_segcblist *rsclp)
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-{
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-	return rsclp->head;
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-}
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-
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-/*
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- * Interim function to return rcu_segcblist head pointer.  Longer term, the
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- * rcu_segcblist will be used more pervasively, removing the need for this
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- * function.
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- */
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-static inline struct rcu_head **rcu_segcblist_tail(struct rcu_segcblist *rsclp)
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-{
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-	WARN_ON_ONCE(rcu_segcblist_empty(rsclp));
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-	return rsclp->tails[RCU_NEXT_TAIL];
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-}
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-
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+void rcu_segcblist_inc_len(struct rcu_segcblist *rsclp);
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 void rcu_segcblist_init(struct rcu_segcblist *rsclp);
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 void rcu_segcblist_disable(struct rcu_segcblist *rsclp);
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+void rcu_segcblist_offload(struct rcu_segcblist *rsclp);
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 bool rcu_segcblist_ready_cbs(struct rcu_segcblist *rsclp);
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 bool rcu_segcblist_pend_cbs(struct rcu_segcblist *rsclp);
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 struct rcu_head *rcu_segcblist_first_cb(struct rcu_segcblist *rsclp);
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 struct rcu_head *rcu_segcblist_first_pend_cb(struct rcu_segcblist *rsclp);
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+bool rcu_segcblist_nextgp(struct rcu_segcblist *rsclp, unsigned long *lp);
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 void rcu_segcblist_enqueue(struct rcu_segcblist *rsclp,
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-			   struct rcu_head *rhp, bool lazy);
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+			   struct rcu_head *rhp);
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 bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp,
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-			   struct rcu_head *rhp, bool lazy);
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+			   struct rcu_head *rhp);
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 void rcu_segcblist_extract_count(struct rcu_segcblist *rsclp,
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 				 struct rcu_cblist *rclp);
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 void rcu_segcblist_extract_done_cbs(struct rcu_segcblist *rsclp,