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Date:   Mon, 23 Mar 2020 13:22:43 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>,
        William Kucharski <william.kucharski@...cle.com>
Subject: [PATCH v10 09/25] mm: Remove 'page_offset' from readahead loop

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

Replace the page_offset variable with 'index + i'.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: John Hubbard <jhubbard@...dia.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
---
 mm/readahead.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/readahead.c b/mm/readahead.c
index 7ce320854bad..ddc63d3b07b8 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -180,12 +180,10 @@ void __do_page_cache_readahead(struct address_space *mapping,
 	 * Preallocate as many pages as we will need.
 	 */
 	for (i = 0; i < nr_to_read; i++) {
-		pgoff_t page_offset = index + i;
-
-		if (page_offset > end_index)
+		if (index + i > end_index)
 			break;
 
-		page = xa_load(&mapping->i_pages, page_offset);
+		page = xa_load(&mapping->i_pages, index + i);
 		if (page && !xa_is_value(page)) {
 			/*
 			 * Page already present?  Kick off the current batch of
@@ -199,7 +197,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
 		page = __page_cache_alloc(gfp_mask);
 		if (!page)
 			break;
-		page->index = page_offset;
+		page->index = index + i;
 		list_add(&page->lru, &page_pool);
 		if (i == nr_to_read - lookahead_size)
 			SetPageReadahead(page);
-- 
2.25.1

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