Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar.

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpusets: Remove an unused variable
  sched/rt: Improve pick_next_highest_task_rt()
  sched: Fix select_fallback_rq() vs cpu_active/cpu_online
  sched/x86/smp: Do not enable IRQs over calibrate_delay()
  sched: Fix compiler warning about declared inline after use
  MAINTAINERS: Update email address for SCHEDULER and PERF EVENTS

1 files changed, 46 insertions, 16 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 157fb9b2b18..e3ed0ecee7c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1265,29 +1265,59 @@ EXPORT_SYMBOL_GPL(kick_process);
  */
 static int select_fallback_rq(int cpu, struct task_struct *p)
 {
-        int dest_cpu;
         const struct cpumask *nodemask = cpumask_of_node(cpu_to_node(cpu));
+        enum { cpuset, possible, fail } state = cpuset;
+        int dest_cpu;
 
         /* Look for allowed, online CPU in same node. */
-        for_each_cpu_and(dest_cpu, nodemask, cpu_active_mask)
+        for_each_cpu_mask(dest_cpu, *nodemask) {
+                if (!cpu_online(dest_cpu))
+                        continue;
+                if (!cpu_active(dest_cpu))
+                        continue;
                 if (cpumask_test_cpu(dest_cpu, tsk_cpus_allowed(p)))
                         return dest_cpu;
+        }
 
-        /* Any allowed, online CPU? */
-        dest_cpu = cpumask_any_and(tsk_cpus_allowed(p), cpu_active_mask);
-        if (dest_cpu < nr_cpu_ids)
-                return dest_cpu;
+        for (;;) {
+                /* Any allowed, online CPU? */
+                for_each_cpu_mask(dest_cpu, *tsk_cpus_allowed(p)) {
+                        if (!cpu_online(dest_cpu))
+                                continue;
+                        if (!cpu_active(dest_cpu))
+                                continue;
+                        goto out;
+                }
 
-        /* No more Mr. Nice Guy. */
-        dest_cpu = cpuset_cpus_allowed_fallback(p);
-        /*
-         * Don't tell them about moving exiting tasks or
-         * kernel threads (both mm NULL), since they never
-         * leave kernel.
-         */
-        if (p->mm && printk_ratelimit()) {
-                printk_sched("process %d (%s) no longer affine to cpu%d\n",
-                                task_pid_nr(p), p->comm, cpu);
+                switch (state) {
+                case cpuset:
+                        /* No more Mr. Nice Guy. */
+                        cpuset_cpus_allowed_fallback(p);
+                        state = possible;
+                        break;
+
+                case possible:
+                        do_set_cpus_allowed(p, cpu_possible_mask);
+                        state = fail;
+                        break;
+
+                case fail:
+                        BUG();
+                        break;
+                }
+        }
+
+out:
+        if (state != cpuset) {
+                /*
+                 * Don't tell them about moving exiting tasks or
+                 * kernel threads (both mm NULL), since they never
+                 * leave kernel.
+                 */
+                if (p->mm && printk_ratelimit()) {
+                        printk_sched("process %d (%s) no longer affine to cpu%d\n",
+                                        task_pid_nr(p), p->comm, cpu);
+                }
         }
 
         return dest_cpu;