linux-kernel - [PATCH] kho: init alloc tags when restoring pages from reserved memory

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Message-ID: <20260109104251.157767-1-ranxiaokai627@163.com>
Date: Fri,  9 Jan 2026 10:42:51 +0000
From: ranxiaokai627@....com
To: graf@...zon.com,
	rppt@...nel.org,
	pasha.tatashin@...een.com,
	pratyush@...nel.org,
	akpm@...ux-foundation.org,
	surenb@...gle.com
Cc: kexec@...ts.infradead.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	ran.xiaokai@....com.cn,
	ranxiaokai627@....com
Subject: [PATCH] kho: init alloc tags when restoring pages from reserved memory

From: Ran Xiaokai <ran.xiaokai@....com.cn>

Memblock pages (including reserved memory) should have their allocation
tags initialized to CODETAG_EMPTY via clear_page_tag_ref() before being
released to the page allocator. When kho restores pages through
kho_restore_page(), missing this call causes mismatched
allocation/deallocation tracking and warning message:
alloc_tag was not set.

Add missing clear_page_tag_ref() annotation in kho_restore_page() to
fix this.

Signed-off-by: Ran Xiaokai <ran.xiaokai@....com.cn>
---
 kernel/liveupdate/kexec_handover.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index cd6b3fb9dcae..2d47f2c50bd8 100644
--- a/kernel/liveupdate/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c
@@ -268,6 +268,7 @@ static struct page *kho_restore_page(phys_addr_t phys, bool is_folio)
 	else
 		kho_init_pages(page, nr_pages);
 
+	clear_page_tag_ref(page);
 	adjust_managed_page_count(page, nr_pages);
 	return page;
 }
-- 
2.25.1