Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[firefly-linux-kernel-4.4.55.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 42a0e9191af5418b55b7c96ace44b8e0c75705f5..ff86c558af4c28dd4c9a7ea92cc592b70bee6d7d 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1507,6 +1507,9 @@ do {                                      \
                divisor = nsec * frequency;
        }
 
+       if (!divisor)
+               return dividend;
+
        return div64_u64(dividend, divisor);
 }
 
@@ -1529,7 +1532,7 @@ static int perf_event_start(struct perf_event *event)
 static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
 {
        struct hw_perf_event *hwc = &event->hw;
-       u64 period, sample_period;
+       s64 period, sample_period;
        s64 delta;
 
        period = perf_calculate_period(event, nsec, count);
@@ -3064,6 +3067,7 @@ __always_inline void perf_output_copy(struct perf_output_handle *handle,
 
                len -= size;
                handle->addr += size;
+               buf += size;
                handle->size -= size;
                if (!handle->size) {
                        struct perf_mmap_data *data = handle->data;
@@ -4054,13 +4058,6 @@ static void perf_swevent_overflow(struct perf_event *event, u64 overflow,
        }
 }
 
-static void perf_swevent_unthrottle(struct perf_event *event)
-{
-       /*
-        * Nothing to do, we already reset hwc->interrupts.
-        */
-}
-
 static void perf_swevent_add(struct perf_event *event, u64 nr,
                               int nmi, struct perf_sample_data *data,
                               struct pt_regs *regs)
@@ -4275,11 +4272,22 @@ static void perf_swevent_disable(struct perf_event *event)
        hlist_del_rcu(&event->hlist_entry);
 }
 
+static void perf_swevent_void(struct perf_event *event)
+{
+}
+
+static int perf_swevent_int(struct perf_event *event)
+{
+       return 0;
+}
+
 static const struct pmu perf_ops_generic = {
        .enable         = perf_swevent_enable,
        .disable        = perf_swevent_disable,
+       .start          = perf_swevent_int,
+       .stop           = perf_swevent_void,
        .read           = perf_swevent_read,
-       .unthrottle     = perf_swevent_unthrottle,
+       .unthrottle     = perf_swevent_void, /* hwc->interrupts already reset */
 };
 
 /*
@@ -4560,8 +4568,10 @@ static int swevent_hlist_get(struct perf_event *event)
 static const struct pmu perf_ops_tracepoint = {
        .enable         = perf_trace_enable,
        .disable        = perf_trace_disable,
+       .start          = perf_swevent_int,
+       .stop           = perf_swevent_void,
        .read           = perf_swevent_read,
-       .unthrottle     = perf_swevent_unthrottle,
+       .unthrottle     = perf_swevent_void,
 };
 
 static int perf_tp_filter_match(struct perf_event *event,