3 files changed, 33 insertions, 11 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 5586a02067d..978d297170a 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -798,7 +798,6 @@ void hw_perf_enable(void)
                  * step2: reprogram moved events into new counters
                  */
                 for (i = 0; i < n_running; i++) {
-
                         event = cpuc->event_list[i];
                         hwc = &event->hw;
 
@@ -813,21 +812,16 @@ void hw_perf_enable(void)
                                 continue;
 
                         x86_pmu_stop(event);
-
-                        hwc->idx = -1;
                 }
 
                 for (i = 0; i < cpuc->n_events; i++) {
-
                         event = cpuc->event_list[i];
                         hwc = &event->hw;
 
-                        if (i < n_running &&
-                            match_prev_assignment(hwc, cpuc, i))
-                                continue;
-
-                        if (hwc->idx == -1)
+                        if (!match_prev_assignment(hwc, cpuc, i))
                                 x86_assign_hw_event(event, cpuc, i);
+                        else if (i < n_running)
+                                continue;
 
                         x86_pmu_start(event);
                 }
@@ -1700,3 +1694,16 @@ struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
 
         return entry;
 }
+
+void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
+{
+        regs->ip = ip;
+        /*
+         * perf_arch_fetch_caller_regs adds another call, we need to increment
+         * the skip level
+         */
+        regs->bp = rewind_frame_pointer(skip + 1);
+        regs->cs = __KERNEL_CS;
+        local_save_flags(regs->flags);
+}
+EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
diff --git a/arch/x86/kernel/dumpstack.h b/arch/x86/kernel/dumpstack.h
index 4fd1420faff..29e5f7c845b 100644
--- a/arch/x86/kernel/dumpstack.h
+++ b/arch/x86/kernel/dumpstack.h
@@ -29,4 +29,19 @@ struct stack_frame {
         struct stack_frame *next_frame;
         unsigned long return_address;
 };
+
+static inline unsigned long rewind_frame_pointer(int n)
+{
+        struct stack_frame *frame;
+
+        get_bp(frame);
+
+#ifdef CONFIG_FRAME_POINTER
+        while (n--)
+                frame = frame->next_frame;
 #endif
+
+        return (unsigned long)frame;
+}
+
+#endif /* DUMPSTACK_H */
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index d5e2a2ebb62..272c9f1f05f 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -208,7 +208,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                         if (in_irq_stack(stack, irq_stack, irq_stack_end)) {
                                 if (ops->stack(data, "IRQ") < 0)
                                         break;
-                                bp = print_context_stack(tinfo, stack, bp,
+                                bp = ops->walk_stack(tinfo, stack, bp,
                                         ops, data, irq_stack_end, &graph);
                                 /*
                                  * We link to the next stack (which would be
@@ -229,7 +229,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
         /*
          * This handles the process stack:
          */
-        bp = print_context_stack(tinfo, stack, bp, ops, data, NULL, &graph);
+        bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph);
         put_cpu();
 }
 EXPORT_SYMBOL(dump_trace);