Re: [PATCH] ptp: kvm: Use decrypted memory in confidential guest on x86

[kernel test robot <lkp@intel.com>]

Hi Jeremi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on horms-ipvs/master]
[also build test WARNING on mst-vhost/linux-next net/master net-next/master linus/master v6.2]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jeremi-Piotrowski/ptp-kvm-Use-decrypted-memory-in-confidential-guest-on-x86/20230220-210441
base:   https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs.git master
patch link:    https://lore.kernel.org/r/20230220130235.2603366-1-jpiotrowski%40linux.microsoft.com
patch subject: [PATCH] ptp: kvm: Use decrypted memory in confidential guest on x86
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230221/202302210943.Xq84rrhU-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/0dd1701fd254692af3d0ca051e092e8dcef190c4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jeremi-Piotrowski/ptp-kvm-Use-decrypted-memory-in-confidential-guest-on-x86/20230220-210441
        git checkout 0dd1701fd254692af3d0ca051e092e8dcef190c4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302210943.Xq84rrhU-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/ptp/ptp_kvm_x86.c: In function 'kvm_arch_ptp_init':
   drivers/ptp/ptp_kvm_x86.c:63:9: error: implicit declaration of function 'kvm_arch_ptp_exit'; did you mean 'kvm_arch_ptp_init'? [-Werror=implicit-function-declaration]
      63 |         kvm_arch_ptp_exit();
         |         ^~~~~~~~~~~~~~~~~
         |         kvm_arch_ptp_init
   drivers/ptp/ptp_kvm_x86.c: At top level:
>> drivers/ptp/ptp_kvm_x86.c:68:6: warning: no previous prototype for 'kvm_arch_ptp_exit' [-Wmissing-prototypes]
      68 | void kvm_arch_ptp_exit(void)
         |      ^~~~~~~~~~~~~~~~~
>> drivers/ptp/ptp_kvm_x86.c:68:6: warning: conflicting types for 'kvm_arch_ptp_exit'; have 'void(void)'
   drivers/ptp/ptp_kvm_x86.c:63:9: note: previous implicit declaration of 'kvm_arch_ptp_exit' with type 'void(void)'
      63 |         kvm_arch_ptp_exit();
         |         ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/kvm_arch_ptp_exit +68 drivers/ptp/ptp_kvm_x86.c

    67	
  > 68	void kvm_arch_ptp_exit(void)
    69	{
    70		if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
    71			WARN_ON(set_memory_encrypted((unsigned long)clock_pair, 1));
    72			free_page((unsigned long)clock_pair);
    73			clock_pair = NULL;
    74		}
    75	}
    76	

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