linux-kernel - [PATCH 1/3] iomap: Use kzalloc to allocate iomap

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Message-Id: <20200821124606.10165-1-willy@infradead.org>
Date:   Fri, 21 Aug 2020 13:46:04 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Yu Kuai <yukuai3@...wei.com>, hch@...radead.org,
        darrick.wong@...cle.com, david@...morbit.com,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Subject: [PATCH 1/3] iomap: Use kzalloc to allocate iomap_page

We can skip most of the initialisation, although spinlocks still
need explicit initialisation as architectures may use a non-zero
value to indicate unlocked.  The comment is no longer useful as
attach_page_private() handles the refcount now.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/iomap/buffered-io.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 13d5cdab8dcd..639d54a4177e 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -49,16 +49,8 @@ iomap_page_create(struct inode *inode, struct page *page)
 	if (iop || i_blocks_per_page(inode, page) <= 1)
 		return iop;
 
-	iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
-	atomic_set(&iop->read_count, 0);
-	atomic_set(&iop->write_count, 0);
+	iop = kzalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
 	spin_lock_init(&iop->uptodate_lock);
-	bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
-
-	/*
-	 * migrate_page_move_mapping() assumes that pages with private data have
-	 * their count elevated by 1.
-	 */
 	attach_page_private(page, iop);
 	return iop;
 }
-- 
2.28.0