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:
  sched: Fix incorrect usage of for_each_cpu_mask() in select_fallback_rq()
  sched: Fix __schedule_bug() output when called from an interrupt
  sched/arch: Introduce the finish_arch_post_lock_switch() scheduler callback

Author: torvalds

kernel/sched/core.c

@@ -1270,7 +1270,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
 	int dest_cpu;
 
 	/* Look for allowed, online CPU in same node. */
-	for_each_cpu_mask(dest_cpu, *nodemask) {
+	for_each_cpu(dest_cpu, nodemask) {
 		if (!cpu_online(dest_cpu))
 			continue;
 		if (!cpu_active(dest_cpu))
@@ -1281,7 +1281,7 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
 
 	for (;;) {
 		/* Any allowed, online CPU? */
-		for_each_cpu_mask(dest_cpu, *tsk_cpus_allowed(p)) {
+		for_each_cpu(dest_cpu, tsk_cpus_allowed(p)) {
 			if (!cpu_online(dest_cpu))
 				continue;
 			if (!cpu_active(dest_cpu))
@@ -1964,6 +1964,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
 	local_irq_enable();
 #endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
 	finish_lock_switch(rq, prev);
+	finish_arch_post_lock_switch();
 
 	fire_sched_in_preempt_notifiers(current);
 	if (mm)
@@ -3101,8 +3102,6 @@ EXPORT_SYMBOL(sub_preempt_count);
  */
 static noinline void __schedule_bug(struct task_struct *prev)
 {
-	struct pt_regs *regs = get_irq_regs();
-
 	if (oops_in_progress)
 		return;
 
@@ -3113,11 +3112,7 @@ static noinline void __schedule_bug(struct task_struct *prev)
 	print_modules();
 	if (irqs_disabled())
 		print_irqtrace_events(prev);
-
-	if (regs)
-		show_regs(regs);
-	else
-		dump_stack();
+	dump_stack();
 }
 
 /*

kernel/sched/sched.h

@@ -681,6 +681,9 @@ static inline int task_running(struct rq *rq, struct task_struct *p)
 #ifndef finish_arch_switch
 # define finish_arch_switch(prev)	do { } while (0)
 #endif
+#ifndef finish_arch_post_lock_switch
+# define finish_arch_post_lock_switch()	do { } while (0)
+#endif
 
 #ifndef __ARCH_WANT_UNLOCKED_CTXSW
 static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)