Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc3 next-20180501]
[cannot apply to tip/x86/core]
[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/Dan-Williams/use-memcpy_mcsafe-for-copy_to_iter/20180502-045742
config: i386-tinyconfig (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 >>):

   lib/iov_iter.c: In function 'copyout_mcsafe':
>> lib/iov_iter.c:146:7: error: implicit declaration of function 'copy_to_user_mcsafe'; did you mean 'copy_to_iter_mcsafe'? [-Werror=implicit-function-declaration]
      n = copy_to_user_mcsafe((__force void *) to, from, n);
          ^~~~~~~~~~~~~~~~~~~
          copy_to_iter_mcsafe
   cc1: some warnings being treated as errors

vim +146 lib/iov_iter.c

   141	
   142	static int copyout_mcsafe(void __user *to, const void *from, size_t n)
   143	{
   144		if (access_ok(VERIFY_WRITE, to, n)) {
   145			kasan_check_read(from, n);
 > 146			n = copy_to_user_mcsafe((__force void *) to, from, n);
   147		}
   148		return n;
   149	}
   150	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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