From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx180.postini.com [74.125.245.180]) by kanga.kvack.org (Postfix) with SMTP id 824A16B0037 for ; Wed, 3 Jul 2013 04:35:20 -0400 (EDT) From: Joonsoo Kim Subject: [RFC PATCH 4/5] readahead: remove end range check Date: Wed, 3 Jul 2013 17:34:19 +0900 Message-Id: <1372840460-5571-5-git-send-email-iamjoonsoo.kim@lge.com> In-Reply-To: <1372840460-5571-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1372840460-5571-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Mel Gorman , David Rientjes , Glauber Costa , Johannes Weiner , KOSAKI Motohiro , Rik van Riel , Hugh Dickins , Minchan Kim , Jiang Liu , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Joonsoo Kim Signed-off-by: Joonsoo Kim 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org