// 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 */