X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fcpu-hotplug.txt;h=bc107cb157a8bba060ce65bb9ded734bfbdd15a8;hb=61d0b53363256e87aeb79286be2dc8f62a9d429a;hp=57a09f99ecb08977d51d883ee5d6caecbc0967ba;hpb=a00428f5b149e36b8225b2a0812742a6dfb07b8c;p=pandora-kernel.git

diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index 57a09f99ecb0..bc107cb157a8 100644
--- a/Documentation/cpu-hotplug.txt
+++ b/Documentation/cpu-hotplug.txt
@@ -97,13 +97,13 @@ at which time hotplug is disabled.
 
 You really dont need to manipulate any of the system cpu maps. They should
 be read-only for most use. When setting up per-cpu resources almost always use
-cpu_possible_map/for_each_cpu() to iterate.
+cpu_possible_map/for_each_possible_cpu() to iterate.
 
 Never use anything other than cpumask_t to represent bitmap of CPUs.
 
 #include <linux/cpumask.h>
 
-for_each_cpu              - Iterate over cpu_possible_map
+for_each_possible_cpu     - Iterate over cpu_possible_map
 for_each_online_cpu       - Iterate over cpu_online_map
 for_each_present_cpu      - Iterate over cpu_present_map
 for_each_cpu_mask(x,mask) - Iterate over some random collection of cpu mask.
@@ -251,16 +251,24 @@ A: This is what you would need in your kernel code to receive notifications.
 		return NOTIFY_OK;
 	}
 
-	static struct notifier_block foobar_cpu_notifer =
+	static struct notifier_block __cpuinitdata foobar_cpu_notifer =
 	{
 	   .notifier_call = foobar_cpu_callback,
 	};
 
+You need to call register_cpu_notifier() from your init function.
+Init functions could be of two types:
+1. early init (init function called when only the boot processor is online).
+2. late init (init function called _after_ all the CPUs are online).
 
-In your init function,
+For the first case, you should add the following to your init function
 
 	register_cpu_notifier(&foobar_cpu_notifier);
 
+For the second case, you should add the following to your init function
+
+	register_hotcpu_notifier(&foobar_cpu_notifier);
+
 You can fail PREPARE notifiers if something doesn't work to prepare resources.
 This will stop the activity and send a following CANCELED event back.