core: Clean up user return notifers use of per_cpu

Instead of using per_cpu(..., raw_smp_processor_id()), use
__get_cpu_var(...).

Signed-off-by: Avi Kivity <avi@redhat.com>
LKML-Reference: <1259578491-4589-1-git-send-email-avi@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/user-return-notifier.c b/kernel/user-return-notifier.c
index 03e2d6fd9b18c99e6141f94f6f0a493ce0c8b133..eb27fd3430a291df4c714b1b462b69d5f9490366 100644 (file)
--- a/kernel/user-return-notifier.c
+++ b/kernel/user-return-notifier.c
@@ -6,8 +6,6 @@
 
 static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);
 
-#define URN_LIST_HEAD per_cpu(return_notifier_list, raw_smp_processor_id())
-
 /*
  * Request a notification when the current cpu returns to userspace.  Must be
  * called in atomic context.  The notifier will also be called in atomic
@@ -16,7 +14,7 @@ static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);
 void user_return_notifier_register(struct user_return_notifier *urn)
 {
        set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
-       hlist_add_head(&urn->link, &URN_LIST_HEAD);
+       hlist_add_head(&urn->link, &__get_cpu_var(return_notifier_list));
 }
 EXPORT_SYMBOL_GPL(user_return_notifier_register);
 
@@ -27,7 +25,7 @@ EXPORT_SYMBOL_GPL(user_return_notifier_register);
 void user_return_notifier_unregister(struct user_return_notifier *urn)
 {
        hlist_del(&urn->link);
-       if (hlist_empty(&URN_LIST_HEAD))
+       if (hlist_empty(&__get_cpu_var(return_notifier_list)))
                clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
 }
 EXPORT_SYMBOL_GPL(user_return_notifier_unregister);