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authorGautham R Shenoy <ego@in.ibm.com>2006-12-06 20:38:58 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:41 -0800
commitf7dff2b12654149c9cac8d8c79b6588759edd5a9 (patch)
tree2fc9e50d6c796d48de577ee4b0704326337771ed /include/linux/cpu.h
parentd3fa72e4556ec1f04e46a0d561d9e785ecaa173d (diff)
downloadop-kernel-dev-f7dff2b12654149c9cac8d8c79b6588759edd5a9.zip
op-kernel-dev-f7dff2b12654149c9cac8d8c79b6588759edd5a9.tar.gz
[PATCH] Handle per-subsystem mutexes for CONFIG_HOTPLUG_CPU not set
Provide a common interface for all the subsystems to lock and unlock their per-subsystem hotcpu mutexes. When CONFIG_HOTPLUG_CPU is not set, these operations would be no-ops. [akpm@osdl.org: macros -> inlines] Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/cpu.h')
-rw-r--r--include/linux/cpu.h23
1 files changed, 21 insertions, 2 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 71dc6ba..bf00ce6 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -24,6 +24,7 @@
#include <linux/compiler.h>
#include <linux/cpumask.h>
#include <asm/semaphore.h>
+#include <linux/mutex.h>
struct cpu {
int node_id; /* The node which contains the CPU */
@@ -74,6 +75,17 @@ extern struct sysdev_class cpu_sysdev_class;
#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */
+
+static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
+{
+ mutex_lock(cpu_hp_mutex);
+}
+
+static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
+{
+ mutex_unlock(cpu_hp_mutex);
+}
+
extern void lock_cpu_hotplug(void);
extern void unlock_cpu_hotplug(void);
#define hotcpu_notifier(fn, pri) { \
@@ -85,7 +97,14 @@ extern void unlock_cpu_hotplug(void);
#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
int cpu_down(unsigned int cpu);
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
-#else
+
+#else /* CONFIG_HOTPLUG_CPU */
+
+static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
+{ }
+static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
+{ }
+
#define lock_cpu_hotplug() do { } while (0)
#define unlock_cpu_hotplug() do { } while (0)
#define lock_cpu_hotplug_interruptible() 0
@@ -95,7 +114,7 @@ int cpu_down(unsigned int cpu);
/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
static inline int cpu_is_offline(int cpu) { return 0; }
-#endif
+#endif /* CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_SUSPEND_SMP
extern int disable_nonboot_cpus(void);
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