linux-kernel - [PATCH] z3fold: Simplify the zhdr initialization code in init_z3fold

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Date:   Wed, 20 Jan 2021 03:58:51 -0500
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] z3fold: Simplify the zhdr initialization code in init_z3fold_page()

We can simplify the zhdr initialization by memset() the zhdr first instead
of set struct member to zero one by one. This would also make code more
compact and clear.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/z3fold.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index 8e53cdf4d190..c1ccf6bb0ffb 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -413,16 +413,10 @@ static struct z3fold_header *init_z3fold_page(struct page *page, bool headless,
 	if (!slots)
 		return NULL;
 
+	memset(zhdr, 0, sizeof(*zhdr));
 	spin_lock_init(&zhdr->page_lock);
 	kref_init(&zhdr->refcount);
-	zhdr->first_chunks = 0;
-	zhdr->middle_chunks = 0;
-	zhdr->last_chunks = 0;
-	zhdr->first_num = 0;
-	zhdr->start_middle = 0;
 	zhdr->cpu = -1;
-	zhdr->foreign_handles = 0;
-	zhdr->mapped_count = 0;
 	zhdr->slots = slots;
 	zhdr->pool = pool;
 	INIT_LIST_HEAD(&zhdr->buddy);
-- 
2.19.1