7f6733c3c6
In the past, SRCU was simple enough that there was little point in making the rcutorture writer stall messages print the SRCU grace-period number state. With the advent of Tree SRCU, this has changed. This commit therefore makes Classic, Tiny, and Tree SRCU report this state to rcutorture as needed. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Mike Galbraith <efault@gmx.de>
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
|
|
* Sleepable Read-Copy Update mechanism for mutual exclusion,
|
|
* tiny variant.
|
|
*
|
|
* 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 (C) IBM Corporation, 2017
|
|
*
|
|
* Author: Paul McKenney <paulmck@us.ibm.com>
|
|
*/
|
|
|
|
#ifndef _LINUX_SRCU_TINY_H
|
|
#define _LINUX_SRCU_TINY_H
|
|
|
|
#include <linux/swait.h>
|
|
|
|
struct srcu_struct {
|
|
int srcu_lock_nesting[2]; /* srcu_read_lock() nesting depth. */
|
|
struct swait_queue_head srcu_wq;
|
|
/* Last srcu_read_unlock() wakes GP. */
|
|
unsigned long srcu_gp_seq; /* GP seq # for callback tagging. */
|
|
struct rcu_segcblist srcu_cblist;
|
|
/* Pending SRCU callbacks. */
|
|
int srcu_idx; /* Current reader array element. */
|
|
bool srcu_gp_running; /* GP workqueue running? */
|
|
bool srcu_gp_waiting; /* GP waiting for readers? */
|
|
struct work_struct srcu_work; /* For driving grace periods. */
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
struct lockdep_map dep_map;
|
|
#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
|
};
|
|
|
|
void srcu_drive_gp(struct work_struct *wp);
|
|
|
|
#define __SRCU_STRUCT_INIT(name) \
|
|
{ \
|
|
.srcu_wq = __SWAIT_QUEUE_HEAD_INITIALIZER(name.srcu_wq), \
|
|
.srcu_cblist = RCU_SEGCBLIST_INITIALIZER(name.srcu_cblist), \
|
|
.srcu_work = __WORK_INITIALIZER(name.srcu_work, srcu_drive_gp), \
|
|
__SRCU_DEP_MAP_INIT(name) \
|
|
}
|
|
|
|
/*
|
|
* This odd _STATIC_ arrangement is needed for API compatibility with
|
|
* Tree SRCU, which needs some per-CPU data.
|
|
*/
|
|
#define DEFINE_SRCU(name) \
|
|
struct srcu_struct name = __SRCU_STRUCT_INIT(name)
|
|
#define DEFINE_STATIC_SRCU(name) \
|
|
static struct srcu_struct name = __SRCU_STRUCT_INIT(name)
|
|
|
|
void synchronize_srcu(struct srcu_struct *sp);
|
|
|
|
static inline void synchronize_srcu_expedited(struct srcu_struct *sp)
|
|
{
|
|
synchronize_srcu(sp);
|
|
}
|
|
|
|
static inline void srcu_barrier(struct srcu_struct *sp)
|
|
{
|
|
synchronize_srcu(sp);
|
|
}
|
|
|
|
static inline unsigned long srcu_batches_completed(struct srcu_struct *sp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void srcutorture_get_gp_data(enum rcutorture_type test_type,
|
|
struct srcu_struct *sp, int *flags,
|
|
unsigned long *gpnum,
|
|
unsigned long *completed)
|
|
{
|
|
if (test_type != SRCU_FLAVOR)
|
|
return;
|
|
*flags = 0;
|
|
*completed = sp->srcu_gp_seq;
|
|
*gpnum = *completed;
|
|
}
|
|
|
|
#endif
|