From: Fengguang Wu <wfg@mail.ustc.edu.cn>

Account I/O block times for the stock readahead, too.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/readahead.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff -puN mm/readahead.c~readahead-account-i-o-block-times-for-stock-readahead mm/readahead.c
--- a/mm/readahead.c~readahead-account-i-o-block-times-for-stock-readahead
+++ a/mm/readahead.c
@@ -1756,15 +1756,15 @@ EXPORT_SYMBOL_GPL(page_cache_readahead_a
  */
 void readahead_cache_hit(struct file_ra_state *ra, struct page *page)
 {
-	if (!prefer_adaptive_readahead())
-		return;
-
 	if (PageActive(page) || PageReferenced(page))
 		return;
 
 	if (!PageUptodate(page))
 		ra_account(ra, RA_EVENT_IO_BLOCK, 1);
 
+	if (!prefer_adaptive_readahead())
+		return;
+
 	if (!ra_has_index(ra, page->index))
 		return;
 
_