linux-kernel - [PATCH] core: clean up user return notifers use of per

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Date:	Mon, 30 Nov 2009 12:54:51 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH] 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@...hat.com>
---
 kernel/user-return-notifier.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/user-return-notifier.c b/kernel/user-return-notifier.c
index 03e2d6f..eb27fd3 100644
--- 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);
-- 
1.6.5.2

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