133 lines
4.7 KiB
Diff
133 lines
4.7 KiB
Diff
From 6b94a73e12692590a8a50695a05912d2eedc6428 Mon Sep 17 00:00:00 2001
|
|
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Date: Tue, 19 Mar 2013 14:44:30 +0100
|
|
Subject: [PATCH 047/365] kernel/SRCU: provide a static initializer
|
|
|
|
There are macros for static initializer for the three out of four
|
|
possible notifier types, that are:
|
|
ATOMIC_NOTIFIER_HEAD()
|
|
BLOCKING_NOTIFIER_HEAD()
|
|
RAW_NOTIFIER_HEAD()
|
|
|
|
This patch provides a static initilizer for the forth type to make it
|
|
complete.
|
|
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
---
|
|
include/linux/notifier.h | 34 +++++++++++++++++++++++++---------
|
|
include/linux/srcu.h | 6 +++---
|
|
2 files changed, 28 insertions(+), 12 deletions(-)
|
|
|
|
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
|
|
index 4149868de4e6..babe5b9bcb91 100644
|
|
--- a/include/linux/notifier.h
|
|
+++ b/include/linux/notifier.h
|
|
@@ -6,7 +6,7 @@
|
|
*
|
|
* Alan Cox <Alan.Cox@linux.org>
|
|
*/
|
|
-
|
|
+
|
|
#ifndef _LINUX_NOTIFIER_H
|
|
#define _LINUX_NOTIFIER_H
|
|
#include <linux/errno.h>
|
|
@@ -42,9 +42,7 @@
|
|
* in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
|
|
* As compensation, srcu_notifier_chain_unregister() is rather expensive.
|
|
* SRCU notifier chains should be used when the chain will be called very
|
|
- * often but notifier_blocks will seldom be removed. Also, SRCU notifier
|
|
- * chains are slightly more difficult to use because they require special
|
|
- * runtime initialization.
|
|
+ * often but notifier_blocks will seldom be removed.
|
|
*/
|
|
|
|
struct notifier_block;
|
|
@@ -90,7 +88,7 @@ struct srcu_notifier_head {
|
|
(name)->head = NULL; \
|
|
} while (0)
|
|
|
|
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
|
|
+/* srcu_notifier_heads must be cleaned up dynamically */
|
|
extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
|
|
#define srcu_cleanup_notifier_head(name) \
|
|
cleanup_srcu_struct(&(name)->srcu);
|
|
@@ -103,7 +101,13 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
|
|
.head = NULL }
|
|
#define RAW_NOTIFIER_INIT(name) { \
|
|
.head = NULL }
|
|
-/* srcu_notifier_heads cannot be initialized statically */
|
|
+
|
|
+#define SRCU_NOTIFIER_INIT(name, pcpu) \
|
|
+ { \
|
|
+ .mutex = __MUTEX_INITIALIZER(name.mutex), \
|
|
+ .head = NULL, \
|
|
+ .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \
|
|
+ }
|
|
|
|
#define ATOMIC_NOTIFIER_HEAD(name) \
|
|
struct atomic_notifier_head name = \
|
|
@@ -115,6 +119,18 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
|
|
struct raw_notifier_head name = \
|
|
RAW_NOTIFIER_INIT(name)
|
|
|
|
+#define _SRCU_NOTIFIER_HEAD(name, mod) \
|
|
+ static DEFINE_PER_CPU(struct srcu_struct_array, \
|
|
+ name##_head_srcu_array); \
|
|
+ mod struct srcu_notifier_head name = \
|
|
+ SRCU_NOTIFIER_INIT(name, name##_head_srcu_array)
|
|
+
|
|
+#define SRCU_NOTIFIER_HEAD(name) \
|
|
+ _SRCU_NOTIFIER_HEAD(name, )
|
|
+
|
|
+#define SRCU_NOTIFIER_HEAD_STATIC(name) \
|
|
+ _SRCU_NOTIFIER_HEAD(name, static)
|
|
+
|
|
#ifdef __KERNEL__
|
|
|
|
extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
|
|
@@ -184,12 +200,12 @@ static inline int notifier_to_errno(int ret)
|
|
|
|
/*
|
|
* Declared notifiers so far. I can imagine quite a few more chains
|
|
- * over time (eg laptop power reset chains, reboot chain (to clean
|
|
+ * over time (eg laptop power reset chains, reboot chain (to clean
|
|
* device units up), device [un]mount chain, module load/unload chain,
|
|
- * low memory chain, screenblank chain (for plug in modular screenblankers)
|
|
+ * low memory chain, screenblank chain (for plug in modular screenblankers)
|
|
* VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
|
|
*/
|
|
-
|
|
+
|
|
/* CPU notfiers are defined in include/linux/cpu.h. */
|
|
|
|
/* netdevice notifiers are defined in include/linux/netdevice.h */
|
|
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
|
|
index dc8eb63c6568..e793d3a257da 100644
|
|
--- a/include/linux/srcu.h
|
|
+++ b/include/linux/srcu.h
|
|
@@ -84,10 +84,10 @@ int init_srcu_struct(struct srcu_struct *sp);
|
|
|
|
void process_srcu(struct work_struct *work);
|
|
|
|
-#define __SRCU_STRUCT_INIT(name) \
|
|
+#define __SRCU_STRUCT_INIT(name, pcpu_name) \
|
|
{ \
|
|
.completed = -300, \
|
|
- .per_cpu_ref = &name##_srcu_array, \
|
|
+ .per_cpu_ref = &pcpu_name, \
|
|
.queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \
|
|
.running = false, \
|
|
.batch_queue = RCU_BATCH_INIT(name.batch_queue), \
|
|
@@ -119,7 +119,7 @@ void process_srcu(struct work_struct *work);
|
|
*/
|
|
#define __DEFINE_SRCU(name, is_static) \
|
|
static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
|
|
- is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name)
|
|
+ is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array)
|
|
#define DEFINE_SRCU(name) __DEFINE_SRCU(name, /* not static */)
|
|
#define DEFINE_STATIC_SRCU(name) __DEFINE_SRCU(name, static)
|
|
|
|
--
|
|
2.28.0
|
|
|