Re: [PATCH] mm: Account pud page tables

From: kbuild test robot
Date: Sun Sep 24 2017 - 17:13:34 EST

Hi Kirill,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.14-rc1 next-20170922]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Kirill-A-Shutemov/mm-Account-pud-page-tables/20170925-035907
config: i386-randconfig-x070-201739 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

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:140:14: warning: passing argument 1 of 'mm_nr_puds' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
mm_nr_puds(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:1608:29: note: expected 'struct mm_struct *' but argument is of type 'const struct mm_struct *'
static inline unsigned long mm_nr_puds(struct mm_struct *mm)
^~~~~~~~~~

vim +140 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\n"
108 "nr_ptes %lu nr_pmds %lu nr_puds %lu map_count %d\n"
109 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
110 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
111 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
112 "start_brk %lx brk %lx start_stack %lx\n"
113 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
114 "binfmt %p flags %lx core_state %p\n"
115 #ifdef CONFIG_AIO
116 "ioctx_table %p\n"
117 #endif
118 #ifdef CONFIG_MEMCG
119 "owner %p "
120 #endif
121 "exe_file %p\n"
122 #ifdef CONFIG_MMU_NOTIFIER
123 "mmu_notifier_mm %p\n"
124 #endif
125 #ifdef CONFIG_NUMA_BALANCING
126 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
127 #endif
128 "tlb_flush_pending %d\n"
129 "def_flags: %#lx(%pGv)\n",
130
131 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
132 #ifdef CONFIG_MMU
133 mm->get_unmapped_area,
134 #endif
135 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
136 mm->pgd, atomic_read(&mm->mm_users),
137 atomic_read(&mm->mm_count),
138 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
139 mm_nr_pmds(mm),
> 140 mm_nr_puds(mm),
141 mm->map_count,
142 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
143 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
144 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
145 mm->start_brk, mm->brk, mm->start_stack,
146 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
147 mm->binfmt, mm->flags, mm->core_state,
148 #ifdef CONFIG_AIO
149 mm->ioctx_table,
150 #endif
151 #ifdef CONFIG_MEMCG
152 mm->owner,
153 #endif
154 mm->exe_file,
155 #ifdef CONFIG_MMU_NOTIFIER
156 mm->mmu_notifier_mm,
157 #endif
158 #ifdef CONFIG_NUMA_BALANCING
159 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
160 #endif
161 atomic_read(&mm->tlb_flush_pending),
162 mm->def_flags, &mm->def_flags
163 );
164 }
165

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