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| author | Gautham R Shenoy <ego@in.ibm.com> | 2008-01-25 21:08:01 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:01 +0100 |
| commit | d221938c049f4845da13c8593132595a6b9222a8 (patch) | |
| tree | 8eae6c7095a3d7d31d7435befc30019540a4d13e /include/linux/cpu.h | |
| parent | 6b2d7700266b9402e12824e11e0099ae6a4a6a79 (diff) | |
| download | kernel-common-d221938c049f4845da13c8593132595a6b9222a8.tar.gz kernel-common-d221938c049f4845da13c8593132595a6b9222a8.tar.bz2 kernel-common-d221938c049f4845da13c8593132595a6b9222a8.zip | |
cpu-hotplug: refcount based cpu hotplug
This patch implements a Refcount + Waitqueue based model for
cpu-hotplug.
Now, a thread which wants to prevent cpu-hotplug, will bump up a global
refcount and the thread which wants to perform a cpu-hotplug operation
will block till the global refcount goes to zero.
The readers, if any, during an ongoing cpu-hotplug operation are blocked
until the cpu-hotplug operation is over.
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Paul Jackson <pj@sgi.com> [For !CONFIG_HOTPLUG_CPU ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/cpu.h')
| -rw-r--r-- | include/linux/cpu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 92f2029a34f3..a40247e4d462 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -83,6 +83,9 @@ static inline void unregister_cpu_notifier(struct notifier_block *nb) #endif /* CONFIG_SMP */ extern struct sysdev_class cpu_sysdev_class; +extern void cpu_hotplug_init(void); +extern void cpu_maps_update_begin(void); +extern void cpu_maps_update_done(void); #ifdef CONFIG_HOTPLUG_CPU /* Stop CPUs going up and down. */ |