[RFC PATCH 4/5] readahead: remove end range check

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

diff --git a/mm/readahead.c b/mm/readahead.c
index daed28d..3932f28 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -166,6 +166,8 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
 		goto out;
 
 	end_index = ((isize - 1) >> PAGE_CACHE_SHIFT);
+	if (offset + nr_to_read > end_index + 1)
+		nr_to_read = end_index - offset + 1;
 
 	/*
 	 * Preallocate as many pages as we will need.
@@ -173,9 +175,6 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
 	for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
 		pgoff_t page_offset = offset + page_idx;
 
-		if (page_offset > end_index)
-			break;
-
 		rcu_read_lock();
 		page = radix_tree_lookup(&mapping->page_tree, page_offset);
 		rcu_read_unlock();
-- 
1.7.9.5

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