[PATCH v2 02/07] cpuset use combined atomic_inc_return calls

[Paul Jackson]

From: Paul Jackson <pj@xxxxxxx>

Replace pairs of calls to <atomic_inc, atomic_read>, with a single
call atomic_inc_return, saving a few bytes of source and kernel text.

Signed-off-by: Paul Jackson <pj@xxxxxxx>

---

 kernel/cpuset.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

--- 2.6.16-rc1-mm5.orig/kernel/cpuset.c	2006-02-07 16:26:03.511639777 -0800
+++ 2.6.16-rc1-mm5/kernel/cpuset.c	2006-02-07 16:26:43.563843169 -0800
@@ -858,8 +858,7 @@ static int update_nodemask(struct cpuset
 
 	mutex_lock(&callback_mutex);
 	cs->mems_allowed = trialcs.mems_allowed;
-	atomic_inc(&cpuset_mems_generation);
-	cs->mems_generation = atomic_read(&cpuset_mems_generation);
+	cs->mems_generation = atomic_inc_return(&cpuset_mems_generation);
 	mutex_unlock(&callback_mutex);
 
 	set_cpuset_being_rebound(cs);		/* causes mpol_copy() rebind */
@@ -1770,8 +1769,7 @@ static long cpuset_create(struct cpuset 
 	atomic_set(&cs->count, 0);
 	INIT_LIST_HEAD(&cs->sibling);
 	INIT_LIST_HEAD(&cs->children);
-	atomic_inc(&cpuset_mems_generation);
-	cs->mems_generation = atomic_read(&cpuset_mems_generation);
+	cs->mems_generation = atomic_inc_return(&cpuset_mems_generation);
 	fmeter_init(&cs->fmeter);
 
 	cs->parent = parent;
@@ -1861,7 +1859,7 @@ int __init cpuset_init_early(void)
 	struct task_struct *tsk = current;
 
 	tsk->cpuset = &top_cpuset;
-	tsk->cpuset->mems_generation = atomic_read(&cpuset_mems_generation);
+	tsk->cpuset->mems_generation = atomic_inc_return(&cpuset_mems_generation);
 	return 0;
 }
 
@@ -1880,8 +1878,7 @@ int __init cpuset_init(void)
 	top_cpuset.mems_allowed = NODE_MASK_ALL;
 
 	fmeter_init(&top_cpuset.fmeter);
-	atomic_inc(&cpuset_mems_generation);
-	top_cpuset.mems_generation = atomic_read(&cpuset_mems_generation);
+	top_cpuset.mems_generation = atomic_inc_return(&cpuset_mems_generation);
 
 	init_task.cpuset = &top_cpuset;
 

-- 
                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@xxxxxxx> 1.650.933.1373
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