Re: [PATCH v4 08/15] Drivers: hv: Introduce per-cpu event ring tail

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

Hi Nuno,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arnd-asm-generic/master]
[also build test WARNING on arm64/for-next/core linus/master v6.6-rc3 next-20230929]
[cannot apply to tip/x86/core]
[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/Nuno-Das-Neves/hyperv-tlfs-Change-shared-HV_REGISTER_-defines-to-HV_MSR_/20230930-041305
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link:    https://lore.kernel.org/r/1696010501-24584-9-git-send-email-nunodasneves%40linux.microsoft.com
patch subject: [PATCH v4 08/15] Drivers: hv: Introduce per-cpu event ring tail
config: x86_64-randconfig-123-20230930 (https://download.01.org/0day-ci/archive/20230930/202309301948.CyCE3Y0P-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230930/202309301948.CyCE3Y0P-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309301948.CyCE3Y0P-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/hv/hv_common.c:98:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void [noderef] __percpu *__pdata @@     got unsigned char [noderef] [usertype] __percpu **extern [addressable] [toplevel] hv_synic_eventring_tail @@
   drivers/hv/hv_common.c:98:21: sparse:     expected void [noderef] __percpu *__pdata
   drivers/hv/hv_common.c:98:21: sparse:     got unsigned char [noderef] [usertype] __percpu **extern [addressable] [toplevel] hv_synic_eventring_tail
>> drivers/hv/hv_common.c:349:41: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned char [noderef] [usertype] __percpu **extern [addressable] [assigned] [toplevel] hv_synic_eventring_tail @@     got unsigned char [usertype] *[noderef] __percpu * @@
   drivers/hv/hv_common.c:349:41: sparse:     expected unsigned char [noderef] [usertype] __percpu **extern [addressable] [assigned] [toplevel] hv_synic_eventring_tail
   drivers/hv/hv_common.c:349:41: sparse:     got unsigned char [usertype] *[noderef] __percpu *
>> drivers/hv/hv_common.c:399:55: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected void const [noderef] __percpu *__vpp_verify @@     got unsigned char [noderef] [usertype] __percpu ** @@
   drivers/hv/hv_common.c:399:55: sparse:     expected void const [noderef] __percpu *__vpp_verify
   drivers/hv/hv_common.c:399:55: sparse:     got unsigned char [noderef] [usertype] __percpu **

vim +98 drivers/hv/hv_common.c

    74	
    75	/*
    76	 * Hyper-V specific initialization and shutdown code that is
    77	 * common across all architectures.  Called from architecture
    78	 * specific initialization functions.
    79	 */
    80	
    81	void __init hv_common_free(void)
    82	{
    83		unregister_sysctl_table(hv_ctl_table_hdr);
    84		hv_ctl_table_hdr = NULL;
    85	
    86		if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE)
    87			hv_kmsg_dump_unregister();
    88	
    89		kfree(hv_vp_index);
    90		hv_vp_index = NULL;
    91	
    92		free_percpu(hyperv_pcpu_output_arg);
    93		hyperv_pcpu_output_arg = NULL;
    94	
    95		free_percpu(hyperv_pcpu_input_arg);
    96		hyperv_pcpu_input_arg = NULL;
    97	
  > 98		free_percpu(hv_synic_eventring_tail);
    99		hv_synic_eventring_tail = NULL;
   100	}
   101	

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