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

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Date:	Wed,  3 Jul 2013 17:34:19 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, David Rientjes <rientjes@...gle.com>,
	Glauber Costa <glommer@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [RFC PATCH 4/5] readahead: remove end range check

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