[mmotm:master 112/209] mm/debug.c:137:21: warning: passing argument 1 of 'mm_pgtables_bytes' discards 'const' qualifier from pointer target type

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   cc4a10c92b384ba2b80393c37639808df0ebbf56
commit: ae7f37f07ee1eb08dd1eaaf79182ce9aa6ef7c09 [112/209] mm: consolidate page table accounting
config: blackfin-allmodconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout ae7f37f07ee1eb08dd1eaaf79182ce9aa6ef7c09
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:13:0,
                    from mm/debug.c:8:
   mm/debug.c: In function 'dump_mm':
>> mm/debug.c:137:21: warning: passing argument 1 of 'mm_pgtables_bytes' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      mm_pgtables_bytes(mm),
                        ^
   include/linux/printk.h:295:35: note: in definition of macro 'pr_emerg'
     printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
                                      ^~~~~~~~~~~
   In file included from mm/debug.c:9:0:
   include/linux/mm.h:1671:29: note: expected 'struct mm_struct *' but argument is of type 'const struct mm_struct *'
    static inline unsigned long mm_pgtables_bytes(struct mm_struct *mm)
                                ^~~~~~~~~~~~~~~~~

vim +137 mm/debug.c

   > 8	#include <linux/kernel.h>
     9	#include <linux/mm.h>
    10	#include <linux/trace_events.h>
    11	#include <linux/memcontrol.h>
    12	#include <trace/events/mmflags.h>
    13	#include <linux/migrate.h>
    14	#include <linux/page_owner.h>
    15	
    16	#include "internal.h"
    17	
    18	char *migrate_reason_names[MR_TYPES] = {
    19		"compaction",
    20		"memory_failure",
    21		"memory_hotplug",
    22		"syscall_or_cpuset",
    23		"mempolicy_mbind",
    24		"numa_misplaced",
    25		"cma",
    26	};
    27	
    28	const struct trace_print_flags pageflag_names[] = {
    29		__def_pageflag_names,
    30		{0, NULL}
    31	};
    32	
    33	const struct trace_print_flags gfpflag_names[] = {
    34		__def_gfpflag_names,
    35		{0, NULL}
    36	};
    37	
    38	const struct trace_print_flags vmaflag_names[] = {
    39		__def_vmaflag_names,
    40		{0, NULL}
    41	};
    42	
    43	void __dump_page(struct page *page, const char *reason)
    44	{
    45		/*
    46		 * Avoid VM_BUG_ON() in page_mapcount().
    47		 * page->_mapcount space in struct page is used by sl[aou]b pages to
    48		 * encode own info.
    49		 */
    50		int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
    51	
    52		pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
    53			  page, page_ref_count(page), mapcount,
    54			  page->mapping, page_to_pgoff(page));
    55		if (PageCompound(page))
    56			pr_cont(" compound_mapcount: %d", compound_mapcount(page));
    57		pr_cont("\n");
    58		BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
    59	
    60		pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
    61	
    62		print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
    63				sizeof(unsigned long), page,
    64				sizeof(struct page), false);
    65	
    66		if (reason)
    67			pr_alert("page dumped because: %s\n", reason);
    68	
    69	#ifdef CONFIG_MEMCG
    70		if (page->mem_cgroup)
    71			pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
    72	#endif
    73	}
    74	
    75	void dump_page(struct page *page, const char *reason)
    76	{
    77		__dump_page(page, reason);
    78		dump_page_owner(page);
    79	}
    80	EXPORT_SYMBOL(dump_page);
    81	
    82	#ifdef CONFIG_DEBUG_VM
    83	
    84	void dump_vma(const struct vm_area_struct *vma)
    85	{
    86		pr_emerg("vma %p start %p end %p\n"
    87			"next %p prev %p mm %p\n"
    88			"prot %lx anon_vma %p vm_ops %p\n"
    89			"pgoff %lx file %p private_data %p\n"
    90			"flags: %#lx(%pGv)\n",
    91			vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
    92			vma->vm_prev, vma->vm_mm,
    93			(unsigned long)pgprot_val(vma->vm_page_prot),
    94			vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
    95			vma->vm_file, vma->vm_private_data,
    96			vma->vm_flags, &vma->vm_flags);
    97	}
    98	EXPORT_SYMBOL(dump_vma);
    99	
   100	void dump_mm(const struct mm_struct *mm)
   101	{
   102		pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
   103	#ifdef CONFIG_MMU
   104			"get_unmapped_area %p\n"
   105	#endif
   106			"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
   107			"pgd %p mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
   108			"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
   109			"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
   110			"start_code %lx end_code %lx start_data %lx end_data %lx\n"
   111			"start_brk %lx brk %lx start_stack %lx\n"
   112			"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
   113			"binfmt %p flags %lx core_state %p\n"
   114	#ifdef CONFIG_AIO
   115			"ioctx_table %p\n"
   116	#endif
   117	#ifdef CONFIG_MEMCG
   118			"owner %p "
   119	#endif
   120			"exe_file %p\n"
   121	#ifdef CONFIG_MMU_NOTIFIER
   122			"mmu_notifier_mm %p\n"
   123	#endif
   124	#ifdef CONFIG_NUMA_BALANCING
   125			"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
   126	#endif
   127			"tlb_flush_pending %d\n"
   128			"def_flags: %#lx(%pGv)\n",
   129	
   130			mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
   131	#ifdef CONFIG_MMU
   132			mm->get_unmapped_area,
   133	#endif
   134			mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
   135			mm->pgd, atomic_read(&mm->mm_users),
   136			atomic_read(&mm->mm_count),
 > 137			mm_pgtables_bytes(mm),
   138			mm->map_count,
   139			mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
   140			mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
   141			mm->start_code, mm->end_code, mm->start_data, mm->end_data,
   142			mm->start_brk, mm->brk, mm->start_stack,
   143			mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
   144			mm->binfmt, mm->flags, mm->core_state,
   145	#ifdef CONFIG_AIO
   146			mm->ioctx_table,
   147	#endif
   148	#ifdef CONFIG_MEMCG
   149			mm->owner,
   150	#endif
   151			mm->exe_file,
   152	#ifdef CONFIG_MMU_NOTIFIER
   153			mm->mmu_notifier_mm,
   154	#endif
   155	#ifdef CONFIG_NUMA_BALANCING
   156			mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
   157	#endif
   158			atomic_read(&mm->tlb_flush_pending),
   159			mm->def_flags, &mm->def_flags
   160		);
   161	}
   162	

---
0-DAY kernel test infrastructure                Open Source Technology Center
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