[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>

1 files changed, 4 insertions, 7 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 9f28e1f00185..44d13c246e5c 100644
--- 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;