[rcu:mmap_sem.2017.08.09a 6/16] mm/mmap.c:162:1: error: type defaults to 'int' in declaration of 'DEFINE_SRCU'

From: kbuild test robot
Date: Wed Aug 09 2017 - 18:10:04 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git mmap_sem.2017.08.09a
head: 39782fbd9252a3ace9b49a55f4dd2a41a6ced31f
commit: 1b801585f6b03276db9722dc725a50ca11439467 [6/16] mm: RCU free VMAs
config: parisc-allnoconfig (attached as .config)
compiler: hppa-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 1b801585f6b03276db9722dc725a50ca11439467
# save the attached .config to linux build tree
make.cross ARCH=parisc

All error/warnings (new ones prefixed by >>):

In file included from mm/mmap.c:53:0:
mm/internal.h: In function 'vma_has_changed':
mm/internal.h:59:26: error: 'struct vm_fault' has no member named 'sequence'
return ret || seq != vmf->sequence;
^~
mm/mmap.c: At top level:
>> mm/mmap.c:162:1: warning: data definition has no type or storage class
DEFINE_SRCU(vma_srcu);
^~~~~~~~~~~
>> mm/mmap.c:162:1: error: type defaults to 'int' in declaration of 'DEFINE_SRCU' [-Werror=implicit-int]
>> mm/mmap.c:162:1: warning: parameter names (without types) in function declaration
cc1: some warnings being treated as errors

vim +162 mm/mmap.c

52
> 53 #include "internal.h"
54
55 #ifndef arch_mmap_check
56 #define arch_mmap_check(addr, len, flags) (0)
57 #endif
58
59 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
60 const int mmap_rnd_bits_min = CONFIG_ARCH_MMAP_RND_BITS_MIN;
61 const int mmap_rnd_bits_max = CONFIG_ARCH_MMAP_RND_BITS_MAX;
62 int mmap_rnd_bits __read_mostly = CONFIG_ARCH_MMAP_RND_BITS;
63 #endif
64 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
65 const int mmap_rnd_compat_bits_min = CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN;
66 const int mmap_rnd_compat_bits_max = CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX;
67 int mmap_rnd_compat_bits __read_mostly = CONFIG_ARCH_MMAP_RND_COMPAT_BITS;
68 #endif
69
70 static bool ignore_rlimit_data;
71 core_param(ignore_rlimit_data, ignore_rlimit_data, bool, 0644);
72
73 static void unmap_region(struct mm_struct *mm,
74 struct vm_area_struct *vma, struct vm_area_struct *prev,
75 unsigned long start, unsigned long end);
76
77 /* description of effects of mapping type and prot in current implementation.
78 * this is due to the limited x86 page protection hardware. The expected
79 * behavior is in parens:
80 *
81 * map_type prot
82 * PROT_NONE PROT_READ PROT_WRITE PROT_EXEC
83 * MAP_SHARED r: (no) no r: (yes) yes r: (no) yes r: (no) yes
84 * w: (no) no w: (no) no w: (yes) yes w: (no) no
85 * x: (no) no x: (no) yes x: (no) yes x: (yes) yes
86 *
87 * MAP_PRIVATE r: (no) no r: (yes) yes r: (no) yes r: (no) yes
88 * w: (no) no w: (no) no w: (copy) copy w: (no) no
89 * x: (no) no x: (no) yes x: (no) yes x: (yes) yes
90 *
91 * On arm64, PROT_EXEC has the following behaviour for both MAP_SHARED and
92 * MAP_PRIVATE:
93 * r: (no) no
94 * w: (no) no
95 * x: (yes) yes
96 */
97 pgprot_t protection_map[16] __ro_after_init = {
98 __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
99 __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
100 };
101
102 pgprot_t vm_get_page_prot(unsigned long vm_flags)
103 {
104 return __pgprot(pgprot_val(protection_map[vm_flags &
105 (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
106 pgprot_val(arch_vm_get_page_prot(vm_flags)));
107 }
108 EXPORT_SYMBOL(vm_get_page_prot);
109
110 static pgprot_t vm_pgprot_modify(pgprot_t oldprot, unsigned long vm_flags)
111 {
112 return pgprot_modify(oldprot, vm_get_page_prot(vm_flags));
113 }
114
115 /* Update vma->vm_page_prot to reflect vma->vm_flags. */
116 void vma_set_page_prot(struct vm_area_struct *vma)
117 {
118 unsigned long vm_flags = vma->vm_flags;
119 pgprot_t vm_page_prot;
120
121 vm_page_prot = vm_pgprot_modify(vma->vm_page_prot, vm_flags);
122 if (vma_wants_writenotify(vma, vm_page_prot)) {
123 vm_flags &= ~VM_SHARED;
124 vm_page_prot = vm_pgprot_modify(vm_page_prot, vm_flags);
125 }
126 /* remove_protection_ptes reads vma->vm_page_prot without mmap_sem */
127 WRITE_ONCE(vma->vm_page_prot, vm_page_prot);
128 }
129
130 /*
131 * Requires inode->i_mapping->i_mmap_rwsem
132 */
133 static void __remove_shared_vm_struct(struct vm_area_struct *vma,
134 struct file *file, struct address_space *mapping)
135 {
136 if (vma->vm_flags & VM_DENYWRITE)
137 atomic_inc(&file_inode(file)->i_writecount);
138 if (vma->vm_flags & VM_SHARED)
139 mapping_unmap_writable(mapping);
140
141 flush_dcache_mmap_lock(mapping);
142 vma_interval_tree_remove(vma, &mapping->i_mmap);
143 flush_dcache_mmap_unlock(mapping);
144 }
145
146 /*
147 * Unlink a file-based vm structure from its interval tree, to hide
148 * vma from rmap and vmtruncate before freeing its page tables.
149 */
150 void unlink_file_vma(struct vm_area_struct *vma)
151 {
152 struct file *file = vma->vm_file;
153
154 if (file) {
155 struct address_space *mapping = file->f_mapping;
156 i_mmap_lock_write(mapping);
157 __remove_shared_vm_struct(vma, file, mapping);
158 i_mmap_unlock_write(mapping);
159 }
160 }
161
> 162 DEFINE_SRCU(vma_srcu);
163

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