pandora: defconfig: enable xpad driver

[pandora-kernel.git] / kernel / cpuset.c

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 46a1d3c..4346f9a 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -983,8 +983,10 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
        need_loop = task_has_mempolicy(tsk) ||
                        !nodes_intersects(*newmems, tsk->mems_allowed);
 
-       if (need_loop)
+       if (need_loop) {
+               local_irq_disable();
                write_seqcount_begin(&tsk->mems_allowed_seq);
+       }
 
        nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
        mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP1);
@@ -992,8 +994,10 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
        mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP2);
        tsk->mems_allowed = *newmems;
 
-       if (need_loop)
+       if (need_loop) {
                write_seqcount_end(&tsk->mems_allowed_seq);
+               local_irq_enable();
+       }
 
        task_unlock(tsk);
 }
@@ -1148,7 +1152,13 @@ done:
 
 int current_cpuset_is_being_rebound(void)
 {
-       return task_cs(current) == cpuset_being_rebound;
+       int ret;
+
+       rcu_read_lock();
+       ret = task_cs(current) == cpuset_being_rebound;
+       rcu_read_unlock();
+
+       return ret;
 }
 
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
@@ -2080,6 +2090,9 @@ static void scan_for_empty_cpusets(struct cpuset *root)
  * (of no affect) on systems that are actively using CPU hotplug
  * but making no active use of cpusets.
  *
+ * The only exception to this is suspend/resume, where we don't
+ * modify cpusets at all.
+ *
  * This routine ensures that top_cpuset.cpus_allowed tracks
  * cpu_active_mask on each CPU hotplug (cpuhp) event.
  *
@@ -2359,9 +2372,9 @@ int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 
        task_lock(current);
        cs = nearest_hardwall_ancestor(task_cs(current));
+       allowed = node_isset(node, cs->mems_allowed);
        task_unlock(current);
 
-       allowed = node_isset(node, cs->mems_allowed);
        mutex_unlock(&callback_mutex);
        return allowed;
 }
@@ -2504,8 +2517,16 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
 
        dentry = task_cs(tsk)->css.cgroup->dentry;
        spin_lock(&cpuset_buffer_lock);
-       snprintf(cpuset_name, CPUSET_NAME_LEN,
-                dentry ? (const char *)dentry->d_name.name : "/");
+
+       if (!dentry) {
+               strcpy(cpuset_name, "/");
+       } else {
+               spin_lock(&dentry->d_lock);
+               strlcpy(cpuset_name, (const char *)dentry->d_name.name,
+                       CPUSET_NAME_LEN);
+               spin_unlock(&dentry->d_lock);
+       }
+
        nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
                           tsk->mems_allowed);
        printk(KERN_INFO "%s cpuset=%s mems_allowed=%s\n",