Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   "zhaoyang.huang" <zhaoyang.huang@unisoc.com>
To:     Mel Gorman <mgorman@techsingularity.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Zhaoyang Huang <huangzhaoyang@gmail.com>, <linux-mm@kvack.org>,
        <linux-kernel@vger.kernel.org>, <ke.wang@unisoc.com>
Subject: [PATCH] mm: check high-order page when free it to pcp
Date:   Mon, 19 Sep 2022 11:47:18 +0800
Message-ID: <1663559238-22918-1-git-send-email-zhaoyang.huang@unisoc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

High-order pcp page escaped from checking when both of DEBUG_VM and debug_pagealloc
are all disabled if it allocated again from pcp_list without going to global
free list, which should be introduced by 44042b4498.

fix:44042b4498

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e008a3d..e77f3a7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1437,7 +1437,7 @@ static bool bulkfree_pcp_prepare(struct page *page)
  */
 static bool free_pcp_prepare(struct page *page, unsigned int order)
 {
-	if (debug_pagealloc_enabled_static())
+	if (debug_pagealloc_enabled_static() || order)
 		return free_pages_prepare(page, order, true, FPI_NONE);
 	else
 		return free_pages_prepare(page, order, false, FPI_NONE);
-- 
1.9.1