The patch titled
cpu hotplug: fix hotplug cpu documentation for proper usage
has been added to the -mm tree. Its filename is
fix-hotplug-cpu-documentation-for-proper-usage.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cpu hotplug: fix hotplug cpu documentation for proper usage
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Update hotplug cpu documentation to clearly state when to use
register_cpu_notifier() and register_hotcpu_notifier.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/cpu-hotplug.txt | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN Documentation/cpu-hotplug.txt~fix-hotplug-cpu-documentation-for-proper-usage Documentation/cpu-hotplug.txt
--- a/Documentation/cpu-hotplug.txt~fix-hotplug-cpu-documentation-for-proper-usage
+++ a/Documentation/cpu-hotplug.txt
@@ -251,16 +251,24 @@ A: This is what you would need in your k
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.
_
Patches currently in -mm which might be from sekharan@xxxxxxxxxx are
process-events-fix-biarch-compatibility-issue-use-__u64-timestamp.patch
taskstats-free-skb-avoid-returns-in.patch
replace-__devinit-with-__cpuinit-for-cpu-notifications.patch
fix-hotplug-cpu-documentation-for-proper-usage.patch
use-hotplug-version-of-registration-in-late-inits.patch
task-watchers-task-watchers.patch
task-watchers-register-per-task-delay-accounting.patch
task-watchers-add-support-for-per-task-watchers.patch
add-srcu-based-notifier-chains.patch
-
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