linux-kernel - [tip:x86/asm] context_tracking: Switch to new static

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Date:	Tue, 24 Nov 2015 01:35:37 -0800
From:	tip-bot for Andy Lutomirski <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	dvlasenk@...hat.com, hpa@...or.com, mingo@...nel.org,
	luto@...nel.org, tglx@...utronix.de, bp@...en8.de,
	peterz@...radead.org, luto@...capital.net, fweisbec@...il.com,
	brgerst@...il.com
Subject: [tip:x86/asm] context_tracking: Switch to new static_branch API

Commit-ID:  ed11a7f1b3bd482bd7d6ef7bc2859c41fb43b9ee
Gitweb:     http://git.kernel.org/tip/ed11a7f1b3bd482bd7d6ef7bc2859c41fb43b9ee
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Thu, 12 Nov 2015 12:59:01 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 24 Nov 2015 09:56:43 +0100

context_tracking: Switch to new static_branch API

This is much less error-prone than the old code.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/812df7e64f120c5c7c08481f36a8caa9f53b2199.1447361906.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/context_tracking_state.h | 4 ++--
 kernel/context_tracking.c              | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index ee956c5..1d34fe6 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -22,12 +22,12 @@ struct context_tracking {
 };
 
 #ifdef CONFIG_CONTEXT_TRACKING
-extern struct static_key context_tracking_enabled;
+extern struct static_key_false context_tracking_enabled;
 DECLARE_PER_CPU(struct context_tracking, context_tracking);
 
 static inline bool context_tracking_is_enabled(void)
 {
-	return static_key_false(&context_tracking_enabled);
+	return static_branch_unlikely(&context_tracking_enabled);
 }
 
 static inline bool context_tracking_cpu_is_enabled(void)
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index d8560ee..9ad37b9 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -24,7 +24,7 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/context_tracking.h>
 
-struct static_key context_tracking_enabled = STATIC_KEY_INIT_FALSE;
+DEFINE_STATIC_KEY_FALSE(context_tracking_enabled);
 EXPORT_SYMBOL_GPL(context_tracking_enabled);
 
 DEFINE_PER_CPU(struct context_tracking, context_tracking);
@@ -191,7 +191,7 @@ void __init context_tracking_cpu_set(int cpu)
 
 	if (!per_cpu(context_tracking.active, cpu)) {
 		per_cpu(context_tracking.active, cpu) = true;
-		static_key_slow_inc(&context_tracking_enabled);
+		static_branch_inc(&context_tracking_enabled);
 	}
 
 	if (initialized)
--
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