linux-kernel - [PATCH 1/2] mm: migrate: restore the nmask after successfully allocating on the target node

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Message-ID: <20250528111038.18378-2-wangchuanguo@inspur.com>
Date: Wed, 28 May 2025 19:10:37 +0800
From: wangchuanguo <wangchuanguo@...pur.com>
To: <akpm@...ux-foundation.org>, <hannes@...xchg.org>, <sj@...nel.org>
CC: <david@...hat.com>, <mhocko@...nel.org>, <zhengqi.arch@...edance.com>,
	<shakeel.butt@...ux.dev>, <lorenzo.stoakes@...cle.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <damon@...ts.linux.dev>, wangchuanguo
	<wangchuanguo@...pur.com>
Subject: [PATCH 1/2] mm: migrate: restore the nmask after successfully allocating on the  target node

If memory is successfully allocated on the target node and the
function directly returns without value restore for nmask,
non-first migration operations in migrate_pages() by again label
may ignore the nmask settings, thereby allowing new memory
allocations for migration on any node.

Signed-off-by: wangchuanguo <wangchuanguo@...pur.com>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f8dfd2864bbf..e13f17244279 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1035,11 +1035,11 @@ struct folio *alloc_migrate_folio(struct folio *src, unsigned long private)
 	mtc->nmask = NULL;
 	mtc->gfp_mask |= __GFP_THISNODE;
 	dst = alloc_migration_target(src, (unsigned long)mtc);
+	mtc->nmask = allowed_mask;
 	if (dst)
 		return dst;
 
 	mtc->gfp_mask &= ~__GFP_THISNODE;
-	mtc->nmask = allowed_mask;
 
 	return alloc_migration_target(src, (unsigned long)mtc);
 }
-- 
2.39.3