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...
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: Fri, 9 Jan 2026 10:42:51 +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/20260113033403.161869-1-ranxiaokai627@163.com Link: https://lkml.kernel.org/r/20260109104251.157767-1-ranxiaokai627@163.com Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation") Signed-off-by: Ran Xiaokai ran.xiaokai@zte.com.cn Reviewed-by: Mike Rapoport (Microsoft) rppt@kernel.org Reviewed-by: Suren Baghdasaryan surenb@google.com Reviewed-by: Pasha Tatashin pasha.tatashin@soleen.com Cc: Alexander Graf graf@amazon.com Cc: Pratyush Yadav pratyush@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
kernel/liveupdate/kexec_handover.c | 1 + 1 file changed, 1 insertion(+)
--- a/kernel/liveupdate/kexec_handover.c~kho-init-alloc-tags-when-restoring-pages-from-reserved-memory +++ a/kernel/liveupdate/kexec_handover.c @@ -255,6 +255,7 @@ static struct page *kho_restore_page(phy if (is_folio && info.order) prep_compound_page(page, info.order);
+ clear_page_tag_ref(page); 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