readahead: mmap read-around simplification

Fold file_ra_state.mmap_hit into file_ra_state.mmap_miss and make it an int.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 15c8413ee92..5dc18d76e70 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1349,7 +1349,7 @@ retry_find:
                  * Do we miss much more than hit in this file? If so,
                  * stop bothering with read-ahead. It will only hurt.
                  */
-                if (ra->mmap_miss > ra->mmap_hit + MMAP_LOTSAMISS)
+                if (ra->mmap_miss > MMAP_LOTSAMISS)
                         goto no_cached_page;
 
                 /*
@@ -1375,7 +1375,7 @@ retry_find:
         }
 
         if (!did_readaround)
-                ra->mmap_hit++;
+                ra->mmap_miss--;
 
         /*
          * We have a locked page in the page cache, now we need to check