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Message-Id: <1500934531-15333-1-git-send-email-paulmck@linux.vnet.ibm.com>
Date: Mon, 24 Jul 2017 15:15:28 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
fweisbec@...il.com, oleg@...hat.com,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 1/4] srcu: Move rcu_scheduler_starting() from Tiny RCU to Tiny SRCU
Other than lockdep support, Tiny RCU has no need for the
scheduler status. However, Tiny SRCU will need this to control
boot-time behavior independent of lockdep. Therefore, this commit
moves rcu_scheduler_starting() from kernel/rcu/tiny_plugin.h to
kernel/rcu/srcutiny.c. This in turn allows the complete removal of
kernel/rcu/tiny_plugin.h.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
include/linux/rcupdate.h | 1 +
include/linux/rcutiny.h | 8 +++-----
kernel/rcu/srcutiny.c | 8 ++++++++
kernel/rcu/tiny.c | 2 --
kernel/rcu/tiny_plugin.h | 47 -----------------------------------------------
5 files changed, 12 insertions(+), 54 deletions(-)
delete mode 100644 kernel/rcu/tiny_plugin.h
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index f816fc72b51e..55c29e1650b9 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -105,6 +105,7 @@ static inline int rcu_preempt_depth(void)
/* Internal to kernel */
void rcu_init(void);
+extern int rcu_scheduler_active __read_mostly;
void rcu_sched_qs(void);
void rcu_bh_qs(void);
void rcu_check_callbacks(int user);
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 5becbbccb998..b3dbf9502fd0 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -116,13 +116,11 @@ static inline void rcu_irq_exit_irqson(void) { }
static inline void rcu_irq_enter_irqson(void) { }
static inline void rcu_irq_exit(void) { }
static inline void exit_rcu(void) { }
-
-#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU)
-extern int rcu_scheduler_active __read_mostly;
+#ifdef CONFIG_SRCU
void rcu_scheduler_starting(void);
-#else /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
+#else /* #ifndef CONFIG_SRCU */
static inline void rcu_scheduler_starting(void) { }
-#endif /* #else #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
+#endif /* #else #ifndef CONFIG_SRCU */
static inline void rcu_end_inkernel_boot(void) { }
static inline bool rcu_is_watching(void) { return true; }
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
index 1a1c1047d2ed..76ac5f50b2c7 100644
--- a/kernel/rcu/srcutiny.c
+++ b/kernel/rcu/srcutiny.c
@@ -33,6 +33,8 @@
#include "rcu_segcblist.h"
#include "rcu.h"
+int rcu_scheduler_active __read_mostly;
+
static int init_srcu_struct_fields(struct srcu_struct *sp)
{
sp->srcu_lock_nesting[0] = 0;
@@ -193,3 +195,9 @@ void synchronize_srcu(struct srcu_struct *sp)
destroy_rcu_head_on_stack(&rs.head);
}
EXPORT_SYMBOL_GPL(synchronize_srcu);
+
+/* Lockdep diagnostics. */
+void __init rcu_scheduler_starting(void)
+{
+ rcu_scheduler_active = RCU_SCHEDULER_RUNNING;
+}
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index f8488965250f..a64eee0db39e 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -56,8 +56,6 @@ static struct rcu_ctrlblk rcu_bh_ctrlblk = {
.curtail = &rcu_bh_ctrlblk.rcucblist,
};
-#include "tiny_plugin.h"
-
void rcu_barrier_bh(void)
{
wait_rcu_gp(call_rcu_bh);
diff --git a/kernel/rcu/tiny_plugin.h b/kernel/rcu/tiny_plugin.h
deleted file mode 100644
index f0a01b2a3062..000000000000
--- a/kernel/rcu/tiny_plugin.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition
- * Internal non-public definitions that provide either classic
- * or preemptible semantics.
- *
- * 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) 2010 Linaro
- *
- * Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
- */
-
-#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU)
-#include <linux/kernel_stat.h>
-
-int rcu_scheduler_active __read_mostly;
-EXPORT_SYMBOL_GPL(rcu_scheduler_active);
-
-/*
- * During boot, we forgive RCU lockdep issues. After this function is
- * invoked, we start taking RCU lockdep issues seriously. Note that unlike
- * Tree RCU, Tiny RCU transitions directly from RCU_SCHEDULER_INACTIVE
- * to RCU_SCHEDULER_RUNNING, skipping the RCU_SCHEDULER_INIT stage.
- * The reason for this is that Tiny RCU does not need kthreads, so does
- * not have to care about the fact that the scheduler is half-initialized
- * at a certain phase of the boot process. Unless SRCU is in the mix.
- */
-void __init rcu_scheduler_starting(void)
-{
- WARN_ON(nr_context_switches() > 0);
- rcu_scheduler_active = IS_ENABLED(CONFIG_SRCU)
- ? RCU_SCHEDULER_INIT : RCU_SCHEDULER_RUNNING;
-}
-
-#endif /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
--
2.5.2
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