perf: Take a hot regs snapshot for trace events

[safe/jmp/linux-2.6] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 359d7f6..45b4b6e 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4318,9 +4318,8 @@ static const struct pmu perf_ops_task_clock = {
 #ifdef CONFIG_EVENT_TRACING
 
 void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
-                         int entry_size)
+                  int entry_size, struct pt_regs *regs)
 {
-       struct pt_regs *regs = get_irq_regs();
        struct perf_sample_data data;
        struct perf_raw_record raw = {
                .size = entry_size,
@@ -4330,12 +4329,9 @@ void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
        perf_sample_data_init(&data, addr);
        data.raw = &raw;
 
-       if (!regs)
-               regs = task_pt_regs(current);
-
        /* Trace events already protected against recursion */
        do_perf_sw_event(PERF_TYPE_TRACEPOINT, event_id, count, 1,
-                               &data, regs);
+                        &data, regs);
 }
 EXPORT_SYMBOL_GPL(perf_tp_event);