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Release 4.15 kernel/rcu/rcu_segcblist.h

Directory: kernel/rcu
/*
 * RCU segmented callback lists, internal-to-rcu header file
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 * Copyright IBM Corporation, 2017
 *
 * Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
 */

#include <linux/rcu_segcblist.h>

/*
 * Account for the fact that a previously dequeued callback turned out
 * to be marked as lazy.
 */

static inline void rcu_cblist_dequeued_lazy(struct rcu_cblist *rclp) { rclp->len_lazy--; }

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void rcu_cblist_init(struct rcu_cblist *rclp); struct rcu_head *rcu_cblist_dequeue(struct rcu_cblist *rclp); /* * Is the specified rcu_segcblist structure empty? * * But careful! The fact that the ->head field is NULL does not * necessarily imply that there are no callbacks associated with * this structure. When callbacks are being invoked, they are * removed as a group. If callback invocation must be preempted, * the remaining callbacks will be added back to the list. Either * way, the counts are updated later. * * So it is often the case that rcu_segcblist_n_cbs() should be used * instead. */
static inline bool rcu_segcblist_empty(struct rcu_segcblist *rsclp) { return !rsclp->head; }

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/* Return number of callbacks in segmented callback list. */
static inline long rcu_segcblist_n_cbs(struct rcu_segcblist *rsclp) { return READ_ONCE(rsclp->len); }

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Ingo Molnar20100.00%1100.00%
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/* Return number of lazy callbacks in segmented callback list. */
static inline long rcu_segcblist_n_lazy_cbs(struct rcu_segcblist *rsclp) { return rsclp->len_lazy; }

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/* Return number of lazy callbacks in segmented callback list. */
static inline long rcu_segcblist_n_nonlazy_cbs(struct rcu_segcblist *rsclp) { return rsclp->len - rsclp->len_lazy; }

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/* * Is the specified rcu_segcblist enabled, for example, not corresponding * to an offline or callback-offloaded CPU? */
static inline bool rcu_segcblist_is_enabled(struct rcu_segcblist *rsclp) { return !!rsclp->tails[RCU_NEXT_TAIL]; }

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/* * Are all segments following the specified segment of the specified * rcu_segcblist structure empty of callbacks? (The specified * segment might well contain callbacks.) */
static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg) { return !*rsclp->tails[seg]; }

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Ingo Molnar1664.00%150.00%
Paul E. McKenney936.00%150.00%
Total25100.00%2100.00%

/* * Interim function to return rcu_segcblist head pointer. Longer term, the * rcu_segcblist will be used more pervasively, removing the need for this * function. */
static inline struct rcu_head *rcu_segcblist_head(struct rcu_segcblist *rsclp) { return rsclp->head; }

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Ingo Molnar1578.95%150.00%
Paul E. McKenney421.05%150.00%
Total19100.00%2100.00%

/* * Interim function to return rcu_segcblist head pointer. Longer term, the * rcu_segcblist will be used more pervasively, removing the need for this * function. */
static inline struct rcu_head **rcu_segcblist_tail(struct rcu_segcblist *rsclp) { WARN_ON_ONCE(rcu_segcblist_empty(rsclp)); return rsclp->tails[RCU_NEXT_TAIL]; }

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Ingo Molnar1754.84%150.00%
Paul E. McKenney1445.16%150.00%
Total31100.00%2100.00%

void rcu_segcblist_init(struct rcu_segcblist *rsclp); void rcu_segcblist_disable(struct rcu_segcblist *rsclp); bool rcu_segcblist_ready_cbs(struct rcu_segcblist *rsclp); bool rcu_segcblist_pend_cbs(struct rcu_segcblist *rsclp); struct rcu_head *rcu_segcblist_first_cb(struct rcu_segcblist *rsclp); struct rcu_head *rcu_segcblist_first_pend_cb(struct rcu_segcblist *rsclp); void rcu_segcblist_enqueue(struct rcu_segcblist *rsclp, struct rcu_head *rhp, bool lazy); bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp, struct rcu_head *rhp, bool lazy); void rcu_segcblist_extract_count(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_extract_done_cbs(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_extract_pend_cbs(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_insert_count(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_insert_done_cbs(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_insert_pend_cbs(struct rcu_segcblist *rsclp, struct rcu_cblist *rclp); void rcu_segcblist_advance(struct rcu_segcblist *rsclp, unsigned long seq); bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq); bool rcu_segcblist_future_gp_needed(struct rcu_segcblist *rsclp, unsigned long seq); void rcu_segcblist_merge(struct rcu_segcblist *dst_rsclp, struct rcu_segcblist *src_rsclp);

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Ingo Molnar30467.26%133.33%
Paul E. McKenney14832.74%266.67%
Total452100.00%3100.00%
Directory: kernel/rcu
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