[rcu:ms 2/2] mm/mlock.c:825:35: error: passing argument 1 of 'down_write_killable_mmap_sem' from incompatible pointer type

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git ms
head:   49683159093b2bd63321b7e997e225a40fe5f3cd
commit: 49683159093b2bd63321b7e997e225a40fe5f3cd [2/2] mm: Apply mmap_sem locking wrappers
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 49683159093b2bd63321b7e997e225a40fe5f3cd
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/mlock.c: In function 'sys_munlockall':
>> mm/mlock.c:825:35: error: passing argument 1 of 'down_write_killable_mmap_sem' from incompatible pointer type [-Werror=incompatible-pointer-types]
     if (down_write_killable_mmap_sem(&current->mm))
                                      ^
   In file included from include/linux/mm.h:16:0,
                    from include/linux/mman.h:4,
                    from mm/mlock.c:9:
   include/linux/mm_types.h:550:19: note: expected 'struct mm_struct *' but argument is of type 'struct mm_struct **'
    static inline int down_write_killable_mmap_sem(struct mm_struct *mm)
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/down_write_killable_mmap_sem +825 mm/mlock.c

   819	}
   820	
   821	SYSCALL_DEFINE0(munlockall)
   822	{
   823		int ret;
   824	
 > 825		if (down_write_killable_mmap_sem(&current->mm))
   826			return -EINTR;
   827		ret = apply_mlockall_flags(0);
   828		up_write_mmap_sem(current->mm);

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