mm: give the 'ret' variable a better name __do_page_cache_readahead

It counts the number of pages acted on, so name it nr_pages to make that
obvious.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/mm/readahead.c b/mm/readahead.c
index 539bbb6..16d0cb1 100644 (file)
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -156,7 +156,7 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
        unsigned long end_index;        /* The last page we want to read */
        LIST_HEAD(page_pool);
        int page_idx;
-       int ret = 0;
+       int nr_pages = 0;
        loff_t isize = i_size_read(inode);
        gfp_t gfp_mask = readahead_gfp_mask(mapping);
 
@@ -187,7 +187,7 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
                list_add(&page->lru, &page_pool);
                if (page_idx == nr_to_read - lookahead_size)
                        SetPageReadahead(page);
-               ret++;
+               nr_pages++;
        }
 
        /*
@@ -195,11 +195,11 @@ int __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
         * uptodate then the caller will launch readpage again, and
         * will then handle the error.
         */
-       if (ret)
-               read_pages(mapping, filp, &page_pool, ret, gfp_mask);
+       if (nr_pages)
+               read_pages(mapping, filp, &page_pool, nr_pages, gfp_mask);
        BUG_ON(!list_empty(&page_pool));
 out:
-       return ret;
+       return nr_pages;
 }
 
 /*