cpuset: rcu_read_lock() to protect task_cs()

[linux-2.6-omap-h63xx.git] / kernel / cpuset.c

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 345ace5117de9ebfdd886e1a959e4b01eefb2374..a841b5c01ef9488c12215252085cd1c94c0948d5 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -375,14 +375,9 @@ void cpuset_update_task_memory_state(void)
        struct task_struct *tsk = current;
        struct cpuset *cs;
 
-       if (task_cs(tsk) == &top_cpuset) {
-               /* Don't need rcu for top_cpuset.  It's never freed. */
-               my_cpusets_mem_gen = top_cpuset.mems_generation;
-       } else {
-               rcu_read_lock();
-               my_cpusets_mem_gen = task_cs(tsk)->mems_generation;
-               rcu_read_unlock();
-       }
+       rcu_read_lock();
+       my_cpusets_mem_gen = task_cs(tsk)->mems_generation;
+       rcu_read_unlock();
 
        if (my_cpusets_mem_gen != tsk->cpuset_mems_generation) {
                mutex_lock(&callback_mutex);