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Date: Wed, 29 Aug 2018 15:20:42 -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, joel@...lfernandes.org,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 14/19] rcu: Express Tiny RCU updates in terms of RCU rather than RCU-sched
This commit renames Tiny RCU functions so that the lowest level of
functionality is RCU (e.g., synchronize_rcu()) rather than RCU-sched
(e.g., synchronize_sched()). This provides greater naming compatibility
with Tree RCU, which will in turn permit more LoC removal once
the RCU-sched and RCU-bh update-side API is removed.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
[ paulmck: Fix Tiny call_rcu()'s EXPORT_SYMBOL() in response to a bug
report from kbuild test robot. ]
---
include/linux/rcupdate.h | 12 +++++-----
include/linux/rcutiny.h | 34 +++++++++++++++-------------
include/linux/rcutree.h | 1 -
kernel/rcu/tiny.c | 48 ++++++++++++++++++++--------------------
4 files changed, 48 insertions(+), 47 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 94474bb6b5c4..1207c6c9bd8b 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -49,15 +49,14 @@
/* Exported common interfaces */
-#ifdef CONFIG_TINY_RCU
-#define call_rcu call_rcu_sched
-#else
-void call_rcu(struct rcu_head *head, rcu_callback_t func);
+#ifndef CONFIG_TINY_RCU
+void synchronize_sched(void);
+void call_rcu_sched(struct rcu_head *head, rcu_callback_t func);
#endif
-void call_rcu_sched(struct rcu_head *head, rcu_callback_t func);
-void synchronize_sched(void);
+void call_rcu(struct rcu_head *head, rcu_callback_t func);
void rcu_barrier_tasks(void);
+void synchronize_rcu(void);
static inline void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
{
@@ -68,7 +67,6 @@ static inline void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
void __rcu_read_lock(void);
void __rcu_read_unlock(void);
-void synchronize_rcu(void);
/*
* Defined as a macro as it is a very low level header included from
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index df2c0895c5e7..e66fb8bc2127 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -36,9 +36,9 @@ static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp)
/* Never flag non-existent other CPUs! */
static inline bool rcu_eqs_special_set(int cpu) { return false; }
-static inline void synchronize_rcu(void)
+static inline void synchronize_sched(void)
{
- synchronize_sched();
+ synchronize_rcu();
}
static inline unsigned long get_state_synchronize_rcu(void)
@@ -61,16 +61,11 @@ static inline void cond_synchronize_sched(unsigned long oldstate)
might_sleep();
}
-static inline void synchronize_rcu_expedited(void)
-{
- synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
-}
+extern void rcu_barrier(void);
-extern void rcu_barrier_sched(void);
-
-static inline void rcu_barrier(void)
+static inline void rcu_barrier_sched(void)
{
- rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
+ rcu_barrier(); /* Only one CPU, so only one list of callbacks! */
}
static inline void rcu_barrier_bh(void)
@@ -88,27 +83,36 @@ static inline void synchronize_rcu_bh_expedited(void)
synchronize_sched();
}
+static inline void synchronize_rcu_expedited(void)
+{
+ synchronize_sched();
+}
+
static inline void synchronize_sched_expedited(void)
{
synchronize_sched();
}
-static inline void kfree_call_rcu(struct rcu_head *head,
- rcu_callback_t func)
+static inline void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
+{
+ call_rcu(head, func);
+}
+
+static inline void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
{
call_rcu(head, func);
}
-void rcu_sched_qs(void);
+void rcu_qs(void);
static inline void rcu_softirq_qs(void)
{
- rcu_sched_qs();
+ rcu_qs();
}
#define rcu_note_context_switch(preempt) \
do { \
- rcu_sched_qs(); \
+ rcu_qs(); \
rcu_tasks_qs(current); \
} while (0)
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 0c44720f0e84..6d30a0809300 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -45,7 +45,6 @@ static inline void rcu_virt_note_context_switch(int cpu)
rcu_note_context_switch(false);
}
-void synchronize_rcu(void);
static inline void synchronize_rcu_bh(void)
{
synchronize_rcu();
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index cadcf63c4889..30826fb6e438 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -46,25 +46,25 @@ struct rcu_ctrlblk {
};
/* Definition for rcupdate control block. */
-static struct rcu_ctrlblk rcu_sched_ctrlblk = {
- .donetail = &rcu_sched_ctrlblk.rcucblist,
- .curtail = &rcu_sched_ctrlblk.rcucblist,
+static struct rcu_ctrlblk rcu_ctrlblk = {
+ .donetail = &rcu_ctrlblk.rcucblist,
+ .curtail = &rcu_ctrlblk.rcucblist,
};
-void rcu_barrier_sched(void)
+void rcu_barrier(void)
{
- wait_rcu_gp(call_rcu_sched);
+ wait_rcu_gp(call_rcu);
}
-EXPORT_SYMBOL(rcu_barrier_sched);
+EXPORT_SYMBOL(rcu_barrier);
/* Record an rcu quiescent state. */
-void rcu_sched_qs(void)
+void rcu_qs(void)
{
unsigned long flags;
local_irq_save(flags);
- if (rcu_sched_ctrlblk.donetail != rcu_sched_ctrlblk.curtail) {
- rcu_sched_ctrlblk.donetail = rcu_sched_ctrlblk.curtail;
+ if (rcu_ctrlblk.donetail != rcu_ctrlblk.curtail) {
+ rcu_ctrlblk.donetail = rcu_ctrlblk.curtail;
raise_softirq(RCU_SOFTIRQ);
}
local_irq_restore(flags);
@@ -79,7 +79,7 @@ void rcu_sched_qs(void)
void rcu_check_callbacks(int user)
{
if (user)
- rcu_sched_qs();
+ rcu_qs();
}
/* Invoke the RCU callbacks whose grace period has elapsed. */
@@ -90,17 +90,17 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
/* Move the ready-to-invoke callbacks to a local list. */
local_irq_save(flags);
- if (rcu_sched_ctrlblk.donetail == &rcu_sched_ctrlblk.rcucblist) {
+ if (rcu_ctrlblk.donetail == &rcu_ctrlblk.rcucblist) {
/* No callbacks ready, so just leave. */
local_irq_restore(flags);
return;
}
- list = rcu_sched_ctrlblk.rcucblist;
- rcu_sched_ctrlblk.rcucblist = *rcu_sched_ctrlblk.donetail;
- *rcu_sched_ctrlblk.donetail = NULL;
- if (rcu_sched_ctrlblk.curtail == rcu_sched_ctrlblk.donetail)
- rcu_sched_ctrlblk.curtail = &rcu_sched_ctrlblk.rcucblist;
- rcu_sched_ctrlblk.donetail = &rcu_sched_ctrlblk.rcucblist;
+ 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. */
@@ -125,21 +125,21 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
*
* Cool, huh? (Due to Josh Triplett.)
*/
-void synchronize_sched(void)
+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_sched() in RCU read-side critical section");
}
-EXPORT_SYMBOL_GPL(synchronize_sched);
+EXPORT_SYMBOL_GPL(synchronize_rcu);
/*
* Post an RCU callback to be invoked after the end of an RCU-sched grace
* period. But since we have but one CPU, that would be after any
* quiescent state.
*/
-void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
+void call_rcu(struct rcu_head *head, rcu_callback_t func)
{
unsigned long flags;
@@ -148,16 +148,16 @@ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
head->next = NULL;
local_irq_save(flags);
- *rcu_sched_ctrlblk.curtail = head;
- rcu_sched_ctrlblk.curtail = &head->next;
+ *rcu_ctrlblk.curtail = head;
+ rcu_ctrlblk.curtail = &head->next;
local_irq_restore(flags);
if (unlikely(is_idle_task(current))) {
- /* force scheduling for rcu_sched_qs() */
+ /* force scheduling for rcu_qs() */
resched_cpu(0);
}
}
-EXPORT_SYMBOL_GPL(call_rcu_sched);
+EXPORT_SYMBOL_GPL(call_rcu);
void __init rcu_init(void)
{
--
2.17.1
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