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

2 files changed, 7 insertions, 9 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e3ed0ecee7c7..4603b9d8f30a 100644
--- a/kernel/sched/core.c
+++ b/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();
 }
 
 /*
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 42b1f304b044..fb3acba4d52e 100644
--- a/kernel/sched/sched.h
+++ b/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)