linux-kernel - [tip:core/rcu] cpu hotplug: Introduce cpu_notifier() to handle !HOTPLUG

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Message-ID: <tip-799e64f05f4bfaad2bb3165cab95c8c992a1c296@git.kernel.org>
Date:	Sat, 15 Aug 2009 17:07:17 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, hugh.dickins@...cali.co.uk,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/rcu] cpu hotplug: Introduce cpu_notifier() to handle !HOTPLUG_CPU case

Commit-ID:  799e64f05f4bfaad2bb3165cab95c8c992a1c296
Gitweb:     http://git.kernel.org/tip/799e64f05f4bfaad2bb3165cab95c8c992a1c296
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Sat, 15 Aug 2009 09:53:47 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 15 Aug 2009 19:02:07 +0200

cpu hotplug: Introduce cpu_notifier() to handle !HOTPLUG_CPU case

This patch introduces a new cpu_notifier() API that is similar
to hotcpu_notifier(), but which also notifies of CPUs coming
online during boot in the !HOTPLUG_CPU case.

Reported-by: Ingo Molnar <mingo@...e.hu>
Reported-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
Tested-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: josht@...ux.vnet.ibm.com
Cc: akpm@...ux-foundation.org
Cc: mathieu.desnoyers@...ymtl.ca
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: benh@...nel.crashing.org
LKML-Reference: <12503552312611-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 include/linux/cpu.h |   17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 4d668e0..4753619 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -48,6 +48,15 @@ struct notifier_block;
 
 #ifdef CONFIG_SMP
 /* Need to know about CPUs going up/down? */
+#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
+#define cpu_notifier(fn, pri) {					\
+	static struct notifier_block fn##_nb __cpuinitdata =	\
+		{ .notifier_call = fn, .priority = pri };	\
+	register_cpu_notifier(&fn##_nb);			\
+}
+#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
+#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
+#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
 #ifdef CONFIG_HOTPLUG_CPU
 extern int register_cpu_notifier(struct notifier_block *nb);
 extern void unregister_cpu_notifier(struct notifier_block *nb);
@@ -74,6 +83,8 @@ extern void cpu_maps_update_done(void);
 
 #else	/* CONFIG_SMP */
 
+#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
+
 static inline int register_cpu_notifier(struct notifier_block *nb)
 {
 	return 0;
@@ -99,11 +110,7 @@ extern struct sysdev_class cpu_sysdev_class;
 
 extern void get_online_cpus(void);
 extern void put_online_cpus(void);
-#define hotcpu_notifier(fn, pri) {				\
-	static struct notifier_block fn##_nb __cpuinitdata =	\
-		{ .notifier_call = fn, .priority = pri };	\
-	register_cpu_notifier(&fn##_nb);			\
-}
+#define hotcpu_notifier(fn, pri)	cpu_notifier(fn, pri)
 #define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)
 #define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)
 int cpu_down(unsigned int cpu);
--
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