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| author | Gautham R Shenoy <ego@in.ibm.com> | 2006-12-06 20:38:58 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:41 -0800 |
| commit | f7dff2b12654149c9cac8d8c79b6588759edd5a9 (patch) | |
| tree | 2fc9e50d6c796d48de577ee4b0704326337771ed /include | |
| parent | d3fa72e4556ec1f04e46a0d561d9e785ecaa173d (diff) | |
| download | kernel-common-f7dff2b12654149c9cac8d8c79b6588759edd5a9.tar.gz kernel-common-f7dff2b12654149c9cac8d8c79b6588759edd5a9.tar.bz2 kernel-common-f7dff2b12654149c9cac8d8c79b6588759edd5a9.zip | |
[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')
| -rw-r--r-- | include/linux/cpu.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 71dc6ba4f73f..bf00ce6ecadf 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); |