kernel/trace/ring_buffer.c: use DIV_ROUND_UP

Instead of open-coding it.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 9542990..4832ffa 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -123,8 +123,7 @@ void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
 EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
 
 #define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
-#define RB_ALIGNMENT_SHIFT     2
-#define RB_ALIGNMENT           (1 << RB_ALIGNMENT_SHIFT)
+#define RB_ALIGNMENT           4U
 #define RB_MAX_SMALL_DATA      28
 
 enum {
@@ -151,7 +150,7 @@ rb_event_length(struct ring_buffer_event *event)
 
        case RINGBUF_TYPE_DATA:
                if (event->len)
-                       length = event->len << RB_ALIGNMENT_SHIFT;
+                       length = event->len * RB_ALIGNMENT;
                else
                        length = event->array[0];
                return length + RB_EVNT_HDR_SIZE;
@@ -937,15 +936,11 @@ rb_update_event(struct ring_buffer_event *event,
                break;
 
        case RINGBUF_TYPE_TIME_EXTEND:
-               event->len =
-                       (RB_LEN_TIME_EXTEND + (RB_ALIGNMENT-1))
-                       >> RB_ALIGNMENT_SHIFT;
+               event->len = DIV_ROUND_UP(RB_LEN_TIME_EXTEND, RB_ALIGNMENT);
                break;
 
        case RINGBUF_TYPE_TIME_STAMP:
-               event->len =
-                       (RB_LEN_TIME_STAMP + (RB_ALIGNMENT-1))
-                       >> RB_ALIGNMENT_SHIFT;
+               event->len = DIV_ROUND_UP(RB_LEN_TIME_STAMP, RB_ALIGNMENT);
                break;
 
        case RINGBUF_TYPE_DATA:
@@ -954,9 +949,7 @@ rb_update_event(struct ring_buffer_event *event,
                        event->len = 0;
                        event->array[0] = length;
                } else
-                       event->len =
-                               (length + (RB_ALIGNMENT-1))
-                               >> RB_ALIGNMENT_SHIFT;
+                       event->len = DIV_ROUND_UP(length, RB_ALIGNMENT);
                break;
        default:
                BUG();