[PATCH] cpuset use combined atomic_inc_return calls

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@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 9f28e1f..44d13c2 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -858,8 +858,7 @@ static int update_nodemask(struct cpuset *cs, char *buf)
 
        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 *parent, const char *name, int mode)
        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;