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-rw-r--r--kernel/user-return-notifier.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/user-return-notifier.c b/kernel/user-return-notifier.c
index 03e2d6fd9b18..eb27fd3430a2 100644
--- a/kernel/user-return-notifier.c
+++ b/kernel/user-return-notifier.c
@@ -6,8 +6,6 @@
6 6
7static DEFINE_PER_CPU(struct hlist_head, return_notifier_list); 7static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);
8 8
9#define URN_LIST_HEAD per_cpu(return_notifier_list, raw_smp_processor_id())
10
11/* 9/*
12 * Request a notification when the current cpu returns to userspace. Must be 10 * Request a notification when the current cpu returns to userspace. Must be
13 * called in atomic context. The notifier will also be called in atomic 11 * 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);
16void user_return_notifier_register(struct user_return_notifier *urn) 14void user_return_notifier_register(struct user_return_notifier *urn)
17{ 15{
18 set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY); 16 set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
19 hlist_add_head(&urn->link, &URN_LIST_HEAD); 17 hlist_add_head(&urn->link, &__get_cpu_var(return_notifier_list));
20} 18}
21EXPORT_SYMBOL_GPL(user_return_notifier_register); 19EXPORT_SYMBOL_GPL(user_return_notifier_register);
22 20
@@ -27,7 +25,7 @@ EXPORT_SYMBOL_GPL(user_return_notifier_register);
27void user_return_notifier_unregister(struct user_return_notifier *urn) 25void user_return_notifier_unregister(struct user_return_notifier *urn)
28{ 26{
29 hlist_del(&urn->link); 27 hlist_del(&urn->link);
30 if (hlist_empty(&URN_LIST_HEAD)) 28 if (hlist_empty(&__get_cpu_var(return_notifier_list)))
31 clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY); 29 clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
32} 30}
33EXPORT_SYMBOL_GPL(user_return_notifier_unregister); 31EXPORT_SYMBOL_GPL(user_return_notifier_unregister);