linux-kernel - [PATCH] z3fold: remove the unnecessary limit in z3fold_compact

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Date:   Fri, 14 Oct 2016 21:35:25 +0800
From:   zhongjiang <zhongjiang@...wei.com>
To:     <vitalywool@...il.com>, <david@...morbit.com>,
        <sjenning@...hat.com>, <ddstreet@...e.org>,
        <akpm@...ux-foundation.org>, <mhocko@...nel.org>, <vbabka@...e.cz>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] z3fold: remove the unnecessary limit in z3fold_compact_page

From: zhong jiang <zhongjiang@...wei.com>

z3fold compact page has nothing with the last_chunks. even if
last_chunks is not free, compact page will proceed.

The patch just remove the limit without functional change.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 mm/z3fold.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index e8fc216..4668e1c 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -258,8 +258,7 @@ static int z3fold_compact_page(struct z3fold_header *zhdr)
 
 
 	if (!test_bit(MIDDLE_CHUNK_MAPPED, &page->private) &&
-	    zhdr->middle_chunks != 0 &&
-	    zhdr->first_chunks == 0 && zhdr->last_chunks == 0) {
+	    zhdr->middle_chunks != 0 && zhdr->first_chunks == 0) {
 		memmove(beg + ZHDR_SIZE_ALIGNED,
 			beg + (zhdr->start_middle << CHUNK_SHIFT),
 			zhdr->middle_chunks << CHUNK_SHIFT);
-- 
1.8.3.1