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

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Message-ID: <20250326031218.487450-1-wangchuanguo@inspur.com>
Date: Wed, 26 Mar 2025 11:12:18 +0800
From: wangchuanguo <wangchuanguo@...pur.com>
To: <akpm@...ux-foundation.org>
CC: <mhiramat@...nel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, wangchuanguo <wangchuanguo@...pur.com>
Subject: [PATCH] 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 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b620d74b0f66..9467b2acef28 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1026,8 +1026,10 @@ 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);
-	if (dst)
+	if (dst) {
+		mtc->nmask = allowed_mask;
 		return dst;
+	}
 
 	mtc->gfp_mask &= ~__GFP_THISNODE;
 	mtc->nmask = allowed_mask;
-- 
2.39.3