Hi Andrey,

I love your patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[cannot apply to v4.17-rc7 next-20180529]
[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/Andrey-Ryabinin/mm-kasan-dont-vfree-nonexistent-vm_area-fix/20180526-093255
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/autofs/inode.o: In function `autofs_new_ino':
>> inode.c:(.text+0x170): multiple definition of `autofs_new_ino'
   fs/autofs/inode.o:inode.c:(.text+0x170): first defined here
   fs/autofs/inode.o: In function `autofs_clean_ino':
>> inode.c:(.text+0x1c0): multiple definition of `autofs_clean_ino'
   fs/autofs/inode.o:inode.c:(.text+0x1c0): first defined here
   fs/autofs/inode.o: In function `autofs_free_ino':
>> inode.c:(.text+0x1f0): multiple definition of `autofs_free_ino'
   fs/autofs/inode.o:inode.c:(.text+0x1f0): first defined here
   fs/autofs/inode.o: In function `autofs_kill_sb':
>> inode.c:(.text+0x200): multiple definition of `autofs_kill_sb'
   fs/autofs/inode.o:inode.c:(.text+0x200): first defined here
   fs/autofs/inode.o: In function `autofs_get_inode':
>> inode.c:(.text+0x250): multiple definition of `autofs_get_inode'
   fs/autofs/inode.o:inode.c:(.text+0x250): first defined here
   fs/autofs/inode.o: In function `autofs_fill_super':
>> inode.c:(.text+0x300): multiple definition of `autofs_fill_super'
   fs/autofs/inode.o:inode.c:(.text+0x300): first defined here
   fs/autofs/root.o: In function `is_autofs_dentry':
>> root.c:(.text+0x1170): multiple definition of `is_autofs_dentry'
   fs/autofs/root.o:root.c:(.text+0x1170): first defined here
>> fs/autofs/root.o:(.rodata+0x0): multiple definition of `autofs_dentry_operations'
   fs/autofs/root.o:(.rodata+0x0): first defined here
>> fs/autofs/root.o:(.rodata+0x40): multiple definition of `autofs_dir_inode_operations'
   fs/autofs/root.o:(.rodata+0x40): first defined here
>> fs/autofs/root.o:(.rodata+0xc0): multiple definition of `autofs_dir_operations'
   fs/autofs/root.o:(.rodata+0xc0): first defined here
>> fs/autofs/root.o:(.rodata+0x140): multiple definition of `autofs_root_operations'
   fs/autofs/root.o:(.rodata+0x140): first defined here
>> fs/autofs/symlink.o:(.rodata+0x0): multiple definition of `autofs_symlink_inode_operations'
   fs/autofs/symlink.o:(.rodata+0x0): first defined here
   fs/autofs/waitq.o: In function `autofs_catatonic_mode':
>> waitq.c:(.text+0x60): multiple definition of `autofs_catatonic_mode'
   fs/autofs/waitq.o:waitq.c:(.text+0x60): first defined here
   fs/autofs/waitq.o: In function `autofs_wait_release':
>> waitq.c:(.text+0x110): multiple definition of `autofs_wait_release'
   fs/autofs/waitq.o:waitq.c:(.text+0x110): first defined here
   fs/autofs/waitq.o: In function `autofs_wait':
>> waitq.c:(.text+0x520): multiple definition of `autofs_wait'
   fs/autofs/waitq.o:waitq.c:(.text+0x520): first defined here
   fs/autofs/expire.o: In function `autofs_expire_direct':
   expire.c:(.text+0x4d0): multiple definition of `autofs_expire_direct'
   fs/autofs/expire.o:expire.c:(.text+0x4d0): first defined here
   fs/autofs/expire.o: In function `autofs_expire_indirect':
   expire.c:(.text+0x5c0): multiple definition of `autofs_expire_indirect'
   fs/autofs/expire.o:expire.c:(.text+0x5c0): first defined here
   fs/autofs/expire.o: In function `autofs_expire_wait':
   expire.c:(.text+0x840): multiple definition of `autofs_expire_wait'
   fs/autofs/expire.o:expire.c:(.text+0x840): first defined here
   fs/autofs/expire.o: In function `autofs_expire_run':
   expire.c:(.text+0x910): multiple definition of `autofs_expire_run'
   fs/autofs/expire.o:expire.c:(.text+0x910): first defined here
   fs/autofs/expire.o: In function `autofs_do_expire_multi':
   expire.c:(.text+0xa30): multiple definition of `autofs_do_expire_multi'
   fs/autofs/expire.o:expire.c:(.text+0xa30): first defined here
   fs/autofs/expire.o: In function `autofs_expire_multi':
   expire.c:(.text+0xb00): multiple definition of `autofs_expire_multi'
   fs/autofs/expire.o:expire.c:(.text+0xb00): first defined here
   fs/autofs/dev-ioctl.o: In function `autofs_dev_ioctl_init':
   dev-ioctl.c:(.init.text+0x0): multiple definition of `autofs_dev_ioctl_init'
   fs/autofs/dev-ioctl.o:dev-ioctl.c:(.init.text+0x0): first defined here
   fs/autofs/dev-ioctl.o: In function `autofs_dev_ioctl_exit':
   dev-ioctl.c:(.text+0xac0): multiple definition of `autofs_dev_ioctl_exit'
   fs/autofs/dev-ioctl.o:dev-ioctl.c:(.text+0xac0): first defined here

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