linux-kernel - [PATCH] mm/huge_memory: ensure huge_zero_folio won't have large

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Message-ID: <20240914015306.3656791-1-linmiaohe@huawei.com>
Date: Sat, 14 Sep 2024 09:53:06 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: <akpm@...ux-foundation.org>
CC: <willy@...radead.org>, <david@...hat.com>, <linmiaohe@...wei.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/huge_memory: ensure huge_zero_folio won't have large_rmappable flag set

Ensure huge_zero_folio won't have large_rmappable flag set. So it can be
reported as thp,zero correctly through stable_page_flags().

Fixes: 5691753d73a2 ("mm: convert huge_zero_page to huge_zero_folio")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/huge_memory.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2a73efea02d7..4e34b7f89daf 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -218,6 +218,8 @@ static bool get_huge_zero_page(void)
 		count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED);
 		return false;
 	}
+	/* Ensure zero folio won't have large_rmappable flag set. */
+	folio_clear_large_rmappable(zero_folio);
 	preempt_disable();
 	if (cmpxchg(&huge_zero_folio, NULL, zero_folio)) {
 		preempt_enable();
-- 
2.33.0