Hi Nuno,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on asm-generic/master]
[cannot apply to tip/master linux/master linus/master tip/x86/core v5.14-rc4 next-20210805]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Nuno-Das-Neves/Microsoft-Hypervisor-root-partition-ioctl-interface/20210806-052633
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
config: i386-randconfig-r011-20210805 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/1de37c917aa5f621982f483857467f3aa1f24983
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Nuno-Das-Neves/Microsoft-Hypervisor-root-partition-ioctl-interface/20210806-052633
        git checkout 1de37c917aa5f621982f483857467f3aa1f24983
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from ./usr/include/linux/mshv.h:12,
                    from <command-line>:32:
>> ./usr/include/asm/hyperv-tlfs.h:751:14: error: C++ style comments are not allowed in ISO C90
     751 |  __u8 cr8:4; // only set for exo partitions
         |              ^
   ./usr/include/asm/hyperv-tlfs.h:751:14: note: (this will be reported only once per input file)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org