linux-kernel - [PATCH 2/2] lockdep: Simplify debug atomic ops

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Date:	Thu, 15 Apr 2010 23:10:43 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 2/2] lockdep: Simplify debug atomic ops

Simplify debug_atomic_inc/dec by using this_cpu_inc/dec() instead
of doing it through an indirect get_cpu_var() and a manual
incrementation.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 kernel/lockdep_internals.h |   10 ++--------
 1 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
index 8d7d4b6..2b17476 100644
--- a/kernel/lockdep_internals.h
+++ b/kernel/lockdep_internals.h
@@ -140,19 +140,13 @@ struct lockdep_stats {
 DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
 
 #define debug_atomic_inc(ptr)			{		\
-	struct lockdep_stats *__cpu_lockdep_stats;		\
-								\
 	WARN_ON_ONCE(!irqs_disabled());				\
-	__cpu_lockdep_stats = &__get_cpu_var(lockdep_stats);	\
-	__cpu_lockdep_stats->ptr++;				\
+	this_cpu_inc(lockdep_stats.ptr);			\
 }
 
 #define debug_atomic_dec(ptr)			{		\
-	struct lockdep_stats *__cpu_lockdep_stats;		\
-								\
 	WARN_ON_ONCE(!irqs_disabled());				\
-	__cpu_lockdep_stats = &__get_cpu_var(lockdep_stats);	\
-	__cpu_lockdep_stats->ptr--;				\
+	this_cpu_inc(lockdep_stats.ptr);			\
 }
 
 #define debug_atomic_read(ptr)		({				\
-- 
1.6.2.3

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