1 files changed, 10 insertions, 32 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index c366a0a9ddba..b641cab2745e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1581,19 +1581,6 @@ static int rb_check_bpage(struct ring_buffer_per_cpu *cpu_buffer,
 }
 
 /**
- * rb_check_list - make sure a pointer to a list has the last bits zero
- */
-static int rb_check_list(struct ring_buffer_per_cpu *cpu_buffer,
-			 struct list_head *list)
-{
-	if (RB_WARN_ON(cpu_buffer, rb_list_head(list->prev) != list->prev))
-		return 1;
-	if (RB_WARN_ON(cpu_buffer, rb_list_head(list->next) != list->next))
-		return 1;
-	return 0;
-}
-
-/**
  * rb_check_pages - integrity check of buffer pages
  * @cpu_buffer: CPU buffer with pages to test
  *
@@ -1602,36 +1589,27 @@ static int rb_check_list(struct ring_buffer_per_cpu *cpu_buffer,
  */
 static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
 {
-	struct list_head *head = cpu_buffer->pages;
-	struct buffer_page *bpage, *tmp;
+	struct list_head *head = rb_list_head(cpu_buffer->pages);
+	struct list_head *tmp;
 
-	/* Reset the head page if it exists */
-	if (cpu_buffer->head_page)
-		rb_set_head_page(cpu_buffer);
-
-	rb_head_page_deactivate(cpu_buffer);
-
-	if (RB_WARN_ON(cpu_buffer, head->next->prev != head))
-		return -1;
-	if (RB_WARN_ON(cpu_buffer, head->prev->next != head))
+	if (RB_WARN_ON(cpu_buffer,
+			rb_list_head(rb_list_head(head->next)->prev) != head))
 		return -1;
 
-	if (rb_check_list(cpu_buffer, head))
+	if (RB_WARN_ON(cpu_buffer,
+			rb_list_head(rb_list_head(head->prev)->next) != head))
 		return -1;
 
-	list_for_each_entry_safe(bpage, tmp, head, list) {
+	for (tmp = rb_list_head(head->next); tmp != head; tmp = rb_list_head(tmp->next)) {
 		if (RB_WARN_ON(cpu_buffer,
-			       bpage->list.next->prev != &bpage->list))
+				rb_list_head(rb_list_head(tmp->next)->prev) != tmp))
 			return -1;
+
 		if (RB_WARN_ON(cpu_buffer,
-			       bpage->list.prev->next != &bpage->list))
-			return -1;
-		if (rb_check_list(cpu_buffer, &bpage->list))
+				rb_list_head(rb_list_head(tmp->prev)->next) != tmp))
 			return -1;
 	}
 
-	rb_head_page_activate(cpu_buffer);
-
 	return 0;
 }