[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
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -858,8 +858,7 @@
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 @@
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 @@
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 @@
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;