diff --git a/mm/debug.c b/mm/debug.c
new file mode 100644
index 0000000..bd10aad
--- /dev/null
+++ b/mm/debug.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mm/debug.c
+ *
+ * mm/ specific debug routines.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/trace_events.h>
+#include <linux/memcontrol.h>
+#include <trace/events/mmflags.h>
+#include <linux/migrate.h>
+#include <linux/page_owner.h>
+
+#include "internal.h"
+
+char *migrate_reason_names[MR_TYPES] = {
+	"compaction",
+	"memory_failure",
+	"memory_hotplug",
+	"syscall_or_cpuset",
+	"mempolicy_mbind",
+	"numa_misplaced",
+	"cma",
+};
+
+const struct trace_print_flags pageflag_names[] = {
+	__def_pageflag_names,
+	{0, NULL}
+};
+
+const struct trace_print_flags gfpflag_names[] = {
+	__def_gfpflag_names,
+	{0, NULL}
+};
+
+const struct trace_print_flags vmaflag_names[] = {
+	__def_vmaflag_names,
+	{0, NULL}
+};
+
+void __dump_page(struct page *page, const char *reason)
+{
+	bool page_poisoned = PagePoisoned(page);
+	int mapcount;
+
+	/*
+	 * If struct page is poisoned don't access Page*() functions as that
+	 * leads to recursive loop. Page*() check for poisoned pages, and calls
+	 * dump_page() when detected.
+	 */
+	if (page_poisoned) {
+		pr_emerg("page:%px is uninitialized and poisoned", page);
+		goto hex_only;
+	}
+
+	/*
+	 * Avoid VM_BUG_ON() in page_mapcount().
+	 * page->_mapcount space in struct page is used by sl[aou]b pages to
+	 * encode own info.
+	 */
+	mapcount = PageSlab(page) ? 0 : page_mapcount(page);
+
+	pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
+		  page, page_ref_count(page), mapcount,
+		  page->mapping, page_to_pgoff(page));
+	if (PageCompound(page))
+		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
+	pr_cont("\n");
+	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
+
+	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
+
+hex_only:
+	print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
+			sizeof(unsigned long), page,
+			sizeof(struct page), false);
+
+	if (reason)
+		pr_alert("page dumped because: %s\n", reason);
+
+#ifdef CONFIG_MEMCG
+	if (!page_poisoned && page->mem_cgroup)
+		pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
+#endif
+}
+
+void dump_page(struct page *page, const char *reason)
+{
+	__dump_page(page, reason);
+	dump_page_owner(page);
+}
+EXPORT_SYMBOL(dump_page);
+
+#ifdef CONFIG_DEBUG_VM
+
+void dump_vma(const struct vm_area_struct *vma)
+{
+	pr_emerg("vma %px start %px end %px\n"
+		"next %px prev %px mm %px\n"
+		"prot %lx anon_vma %px vm_ops %px\n"
+		"pgoff %lx file %px private_data %px\n"
+		"flags: %#lx(%pGv)\n",
+		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
+		vma->vm_prev, vma->vm_mm,
+		(unsigned long)pgprot_val(vma->vm_page_prot),
+		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
+		vma->vm_file, vma->vm_private_data,
+		vma->vm_flags, &vma->vm_flags);
+}
+EXPORT_SYMBOL(dump_vma);
+
+void dump_mm(const struct mm_struct *mm)
+{
+	pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
+#ifdef CONFIG_MMU
+		"get_unmapped_area %px\n"
+#endif
+		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
+		"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
+		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
+		"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
+		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
+		"start_brk %lx brk %lx start_stack %lx\n"
+		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
+		"binfmt %px flags %lx core_state %px\n"
+#ifdef CONFIG_AIO
+		"ioctx_table %px\n"
+#endif
+#ifdef CONFIG_MEMCG
+		"owner %px "
+#endif
+		"exe_file %px\n"
+#ifdef CONFIG_MMU_NOTIFIER
+		"mmu_notifier_mm %px\n"
+#endif
+#ifdef CONFIG_NUMA_BALANCING
+		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
+#endif
+		"tlb_flush_pending %d\n"
+		"def_flags: %#lx(%pGv)\n",
+
+		mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
+#ifdef CONFIG_MMU
+		mm->get_unmapped_area,
+#endif
+		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
+		mm->pgd, atomic_read(&mm->mm_users),
+		atomic_read(&mm->mm_count),
+		mm_pgtables_bytes(mm),
+		mm->map_count,
+		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
+		mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
+		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
+		mm->start_brk, mm->brk, mm->start_stack,
+		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
+		mm->binfmt, mm->flags, mm->core_state,
+#ifdef CONFIG_AIO
+		mm->ioctx_table,
+#endif
+#ifdef CONFIG_MEMCG
+		mm->owner,
+#endif
+		mm->exe_file,
+#ifdef CONFIG_MMU_NOTIFIER
+		mm->mmu_notifier_mm,
+#endif
+#ifdef CONFIG_NUMA_BALANCING
+		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
+#endif
+		atomic_read(&mm->tlb_flush_pending),
+		mm->def_flags, &mm->def_flags
+	);
+}
+
+#endif		/* CONFIG_DEBUG_VM */