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authorGautham R Shenoy <ego@in.ibm.com>2008-01-25 21:08:02 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:02 +0100
commit86ef5c9a8edd78e6bf92879f32329d89b2d55b5a (patch)
tree7bf46885326a6fdbb0c3596855408e9a5634dd3a /kernel/cpu.c
parentd221938c049f4845da13c8593132595a6b9222a8 (diff)
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
Replace all lock_cpu_hotplug/unlock_cpu_hotplug from the kernel and use get_online_cpus and put_online_cpus instead as it highlights the refcount semantics in these operations. The new API guarantees protection against the cpu-hotplug operation, but it doesn't guarantee serialized access to any of the local data structures. Hence the changes needs to be reviewed. In case of pseries_add_processor/pseries_remove_processor, use cpu_maps_update_begin()/cpu_maps_update_done() as we're modifying the cpu_present_map there. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 656dc3fcbbae..b0c4152995f8 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -48,7 +48,7 @@ void __init cpu_hotplug_init(void)
#ifdef CONFIG_HOTPLUG_CPU
-void lock_cpu_hotplug(void)
+void get_online_cpus(void)
{
might_sleep();
if (cpu_hotplug.active_writer == current)
@@ -58,9 +58,9 @@ void lock_cpu_hotplug(void)
mutex_unlock(&cpu_hotplug.lock);
}
-EXPORT_SYMBOL_GPL(lock_cpu_hotplug);
+EXPORT_SYMBOL_GPL(get_online_cpus);
-void unlock_cpu_hotplug(void)
+void put_online_cpus(void)
{
if (cpu_hotplug.active_writer == current)
return;
@@ -73,7 +73,7 @@ void unlock_cpu_hotplug(void)
mutex_unlock(&cpu_hotplug.lock);
}
-EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);
+EXPORT_SYMBOL_GPL(put_online_cpus);
#endif /* CONFIG_HOTPLUG_CPU */
@@ -110,7 +110,7 @@ void cpu_maps_update_done(void)
* non zero and goes to sleep again.
*
* However, this is very difficult to achieve in practice since
- * lock_cpu_hotplug() not an api which is called all that often.
+ * get_online_cpus() not an api which is called all that often.
*
*/
static void cpu_hotplug_begin(void)

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