+ kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: kho: init alloc tags when restoring pages from reserved memory
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Subject: kho: init alloc tags when restoring pages from reserved memory
Date: Thu, 22 Jan 2026 13:27:40 +0000

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 below warning message:

alloc_tag was not set
WARNING: include/linux/alloc_tag.h:164 at ___free_pages+0xb8/0x260, CPU#1: swapper/0/1
RIP: 0010:___free_pages+0xb8/0x260
 kho_restore_vmalloc+0x187/0x2e0
 kho_test_init+0x3c4/0xa30
 do_one_initcall+0x62/0x2b0
 kernel_init_freeable+0x25b/0x480
 kernel_init+0x1a/0x1c0
 ret_from_fork+0x2d1/0x360

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

Link: https://lkml.kernel.org/r/20260122132740.176468-1-ranxiaokai627@163.com
Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation")
Signed-off-by: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/liveupdate/kexec_handover.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/kernel/liveupdate/kexec_handover.c~kho-init-alloc-tags-when-restoring-pages-from-reserved-memory
+++ a/kernel/liveupdate/kexec_handover.c
@@ -255,6 +255,14 @@ static struct page *kho_restore_page(phy
 	if (is_folio && info.order)
 		prep_compound_page(page, info.order);
 
+	/* Always mark headpage's codetag as empty to avoid accounting mismatch */
+	clear_page_tag_ref(page);
+	if (!is_folio) {
+		/* Also do that for the non-compound tail pages */
+		for (unsigned int i = 1; i < nr_pages; i++)
+			clear_page_tag_ref(page + i);
+	}
+
 	adjust_managed_page_count(page, nr_pages);
 	return page;
 }
_

Patches currently in -mm which might be from ran.xiaokai@zte.com.cn are

kho-init-alloc-tags-when-restoring-pages-from-reserved-memory.patch
alloc_tag-fix-rw-permission-issue-when-handling-boot-parameter.patch