From 93d81d1aca26e64a75d06a85f7e128b5f49053e7 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 14 Jan 2009 15:32:51 +0100
Subject: [PATCH] mutex: small cleanup
Remove a local variable by combining an assingment and test in one.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/mutex.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 4f45d4b658ef..357c6d221efe 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -129,7 +129,6 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
{
struct task_struct *task = current;
struct mutex_waiter waiter;
- unsigned int old_val;
unsigned long flags;
spin_lock_mutex(&lock->wait_lock, flags);
@@ -142,8 +141,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
list_add_tail(&waiter.list, &lock->wait_list);
waiter.task = task;
- old_val = atomic_xchg(&lock->count, -1);
- if (old_val == 1)
+ if (atomic_xchg(&lock->count, -1) == 1)
goto done;
lock_contended(&lock->dep_map, ip);
@@ -158,8 +156,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
* that when we release the lock, we properly wake up the
* other waiters:
*/
- old_val = atomic_xchg(&lock->count, -1);
- if (old_val == 1)
+ if (atomic_xchg(&lock->count, -1) == 1)
break;
/*
--
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