1 files changed, 7 insertions, 7 deletions

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index e4d70f33792f..c52a32fa5592 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -105,7 +105,7 @@ int perf_output_begin(struct perf_output_handle *handle,
 {
         struct ring_buffer *rb;
         unsigned long tail, offset, head;
-        int have_lost;
+        int have_lost, page_shift;
         struct {
                 struct perf_event_header header;
                 u64                      id;
@@ -159,12 +159,12 @@ int perf_output_begin(struct perf_output_handle *handle,
         if (unlikely(head - local_read(&rb->wakeup) > rb->watermark))
                 local_add(rb->watermark, &rb->wakeup);
 
-        handle->page = offset >> (PAGE_SHIFT + page_order(rb));
-        handle->page &= rb->nr_pages - 1;
-        handle->size = offset & ((PAGE_SIZE << page_order(rb)) - 1);
-        handle->addr = rb->data_pages[handle->page];
-        handle->addr += handle->size;
-        handle->size = (PAGE_SIZE << page_order(rb)) - handle->size;
+        page_shift = PAGE_SHIFT + page_order(rb);
+
+        handle->page = (offset >> page_shift) & (rb->nr_pages - 1);
+        offset &= (1UL << page_shift) - 1;
+        handle->addr = rb->data_pages[handle->page] + offset;
+        handle->size = (1UL << page_shift) - offset;
 
         if (unlikely(have_lost)) {
                 struct perf_sample_data sample_data;