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From:   Usama Arif <usama.arif@bytedance.com>
To:     linux-mm@kvack.org, muchun.song@linux.dev, mike.kravetz@oracle.com,
        rppt@kernel.org
Cc:     linux-kernel@vger.kernel.org, fam.zheng@bytedance.com,
        liangma@liangbit.com, simon.evans@bytedance.com,
        punit.agrawal@bytedance.com, Usama Arif <usama.arif@bytedance.com>
Subject: [RFC 3/4] mm/hugetlb_vmemmap: Use nid of the head page to reallocate it
Date:   Mon, 24 Jul 2023 14:46:43 +0100
Message-Id: <20230724134644.1299963-4-usama.arif@bytedance.com>
In-Reply-To: <20230724134644.1299963-1-usama.arif@bytedance.com>
References: <20230724134644.1299963-1-usama.arif@bytedance.com>
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If tail page prep and initialization is skipped, then the "start"
page will not contain the correct nid. Use the nid from first
vmemap page.

Signed-off-by: Usama Arif <usama.arif@bytedance.com>
---
 mm/hugetlb_vmemmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index b721e87de2b3..bdf750a4786b 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -324,7 +324,7 @@ static int vmemmap_remap_free(unsigned long start, unsigned long end,
 		.reuse_addr	= reuse,
 		.vmemmap_pages	= &vmemmap_pages,
 	};
-	int nid = page_to_nid((struct page *)start);
+	int nid = page_to_nid((struct page *)reuse);
 	gfp_t gfp_mask = GFP_KERNEL | __GFP_THISNODE | __GFP_NORETRY |
 			__GFP_NOWARN;
 
-- 
2.25.1