Re: [PATCH 1/3] arm64: hyperv: move hyperv detection earlier in boot

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

Hi Anirudh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251125]
[also build test WARNING on v6.18-rc7]
[cannot apply to arm64/for-next/core tip/irq/core arnd-asm-generic/master linus/master v6.18-rc7 v6.18-rc6 v6.18-rc5]
[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/Anirudh-Raybharam/arm64-hyperv-move-hyperv-detection-earlier-in-boot/20251126-011057
base:   next-20251125
patch link:    https://lore.kernel.org/r/20251125170124.2443340-2-anirudh%40anirudhrb.com
patch subject: [PATCH 1/3] arm64: hyperv: move hyperv detection earlier in boot
config: arm64-randconfig-003-20251127 (https://download.01.org/0day-ci/archive/20251127/202511271709.lBS024jA-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 9.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251127/202511271709.lBS024jA-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/202511271709.lBS024jA-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/arm64/include/asm/mshyperv.h:66,
                    from arch/arm64/kernel/setup.c:57:
   include/asm-generic/mshyperv.h:326:38: error: return type is an incomplete type
     326 | static inline enum hv_isolation_type hv_get_isolation_type(void)
         |                                      ^~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/mshyperv.h: In function 'hv_get_isolation_type':
   include/asm-generic/mshyperv.h:328:9: error: 'HV_ISOLATION_TYPE_NONE' undeclared (first use in this function)
     328 |  return HV_ISOLATION_TYPE_NONE;
         |         ^~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/mshyperv.h:328:9: note: each undeclared identifier is reported only once for each function it appears in
>> include/asm-generic/mshyperv.h:328:9: warning: 'return' with a value, in function returning void [-Wreturn-type]
   include/asm-generic/mshyperv.h:326:38: note: declared here
     326 | static inline enum hv_isolation_type hv_get_isolation_type(void)
         |                                      ^~~~~~~~~~~~~~~~~~~~~


vim +/return +328 include/asm-generic/mshyperv.h

7ad9bb9d0f357d Wei Liu                  2021-09-10  289  
3817854ba89201 Nuno Das Neves           2025-03-14  290  #define _hv_status_fmt(fmt) "%s: Hyper-V status: %#x = %s: " fmt
3817854ba89201 Nuno Das Neves           2025-03-14  291  #define hv_status_printk(level, status, fmt, ...) \
3817854ba89201 Nuno Das Neves           2025-03-14  292  do { \
3817854ba89201 Nuno Das Neves           2025-03-14  293  	u64 __status = (status); \
3817854ba89201 Nuno Das Neves           2025-03-14  294  	pr_##level(_hv_status_fmt(fmt), __func__, hv_result(__status), \
3817854ba89201 Nuno Das Neves           2025-03-14  295  		   hv_result_to_string(__status), ##__VA_ARGS__); \
3817854ba89201 Nuno Das Neves           2025-03-14  296  } while (0)
3817854ba89201 Nuno Das Neves           2025-03-14  297  #define hv_status_err(status, fmt, ...) \
3817854ba89201 Nuno Das Neves           2025-03-14  298  	hv_status_printk(err, status, fmt, ##__VA_ARGS__)
3817854ba89201 Nuno Das Neves           2025-03-14  299  #define hv_status_debug(status, fmt, ...) \
3817854ba89201 Nuno Das Neves           2025-03-14  300  	hv_status_printk(debug, status, fmt, ##__VA_ARGS__)
3817854ba89201 Nuno Das Neves           2025-03-14  301  
3817854ba89201 Nuno Das Neves           2025-03-14  302  const char *hv_result_to_string(u64 hv_status);
9d8731a1757bef Nuno Das Neves           2025-02-21  303  int hv_result_to_errno(u64 status);
f3a99e761efa61 Tianyu Lan               2020-04-06  304  void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
765e33f5211ab6 Michael Kelley           2019-05-30  305  bool hv_is_hyperv_initialized(void);
b96f86534fa310 Dexuan Cui               2019-11-19  306  bool hv_is_hibernation_supported(void);
a6c76bb08dc7f7 Andrea Parri (Microsoft  2021-02-01  307) enum hv_isolation_type hv_get_isolation_type(void);
a6c76bb08dc7f7 Andrea Parri (Microsoft  2021-02-01  308) bool hv_is_isolation_supported(void);
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25  309  bool hv_isolation_type_snp(void);
20c89a559e00df Tianyu Lan               2021-10-25  310  u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size);
d6e0228d265f29 Dexuan Cui               2023-08-24  311  u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
3e1b611515d286 Tianyu Lan               2025-09-18  312  void hv_enable_coco_interrupt(unsigned int cpu, unsigned int vector, bool set);
a156ad8c508209 Roman Kisel              2025-10-08  313  void hv_para_set_sint_proxy(bool enable);
e6eeb3c782739c Roman Kisel              2025-10-08  314  u64 hv_para_get_synic_register(unsigned int reg);
e6eeb3c782739c Roman Kisel              2025-10-08  315  void hv_para_set_synic_register(unsigned int reg, u64 val);
765e33f5211ab6 Michael Kelley           2019-05-30  316  void hyperv_cleanup(void);
6dc2a774cb4fdb Sunil Muthuswamy         2021-03-23  317  bool hv_query_ext_cap(u64 cap_query);
37200078ed6aa2 Michael Kelley           2022-03-24  318  void hv_setup_dma_ops(struct device *dev, bool coherent);
765e33f5211ab6 Michael Kelley           2019-05-30  319  #else /* CONFIG_HYPERV */
db912b8954c23a Nuno Das Neves           2025-02-21  320  static inline void hv_identify_partition_type(void) {}
765e33f5211ab6 Michael Kelley           2019-05-30  321  static inline bool hv_is_hyperv_initialized(void) { return false; }
b96f86534fa310 Dexuan Cui               2019-11-19  322  static inline bool hv_is_hibernation_supported(void) { return false; }
765e33f5211ab6 Michael Kelley           2019-05-30  323  static inline void hyperv_cleanup(void) {}
f2580a907e5c0e Michael Kelley           2024-03-18  324  static inline void ms_hyperv_late_init(void) {}
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25  325  static inline bool hv_is_isolation_supported(void) { return false; }
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25  326  static inline enum hv_isolation_type hv_get_isolation_type(void)
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25  327  {
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25 @328  	return HV_ISOLATION_TYPE_NONE;
0cc4f6d9f0b9f2 Tianyu Lan               2021-10-25  329  }
765e33f5211ab6 Michael Kelley           2019-05-30  330  #endif /* CONFIG_HYPERV */
765e33f5211ab6 Michael Kelley           2019-05-30  331  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki