[lantianyu:test 18/21] arch/x86/include/asm/mshyperv.h:62:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations

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

tree:   https://github.com/lantianyu/linux test
head:   f5c4c5f104612a69401a5343609c6f939716896a
commit: 21ff4de070a797f04aafc8cf608d3b4dbc67aa81 [18/21] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest
config: x86_64-buildonly-randconfig-r001-20230817 (https://download.01.org/0day-ci/archive/20230817/202308170331.IdBMI6ij-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230817/202308170331.IdBMI6ij-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/202308170331.IdBMI6ij-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/hv/channel_mgmt.c:23:
>> arch/x86/include/asm/mshyperv.h:62:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
   arch/x86/include/asm/mshyperv.h:114:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
   arch/x86/include/asm/mshyperv.h:165:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
>> arch/x86/include/asm/mshyperv.h:265:13: error: conflicting types for 'hv_isolation_type_en_snp'
   extern bool hv_isolation_type_en_snp(void);
               ^
   arch/x86/include/asm/mshyperv.h:62:6: note: previous implicit declaration is here
           if (hv_isolation_type_en_snp()) {
               ^
   4 errors generated.
--
   In file included from drivers/hv/vmbus_drv.c:40:
>> arch/x86/include/asm/mshyperv.h:62:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
   arch/x86/include/asm/mshyperv.h:114:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
   arch/x86/include/asm/mshyperv.h:165:6: error: call to undeclared function 'hv_isolation_type_en_snp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (hv_isolation_type_en_snp()) {
               ^
>> arch/x86/include/asm/mshyperv.h:265:13: error: conflicting types for 'hv_isolation_type_en_snp'
   extern bool hv_isolation_type_en_snp(void);
               ^
   arch/x86/include/asm/mshyperv.h:62:6: note: previous implicit declaration is here
           if (hv_isolation_type_en_snp()) {
               ^
   drivers/hv/vmbus_drv.c:1910:42: warning: shift count >= width of type [-Wshift-count-overflow]
           dma_set_mask(&child_device_obj->device, DMA_BIT_MASK(64));
                                                   ^~~~~~~~~~~~~~~~
   include/linux/dma-mapping.h:77:54: note: expanded from macro 'DMA_BIT_MASK'
   #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
                                                        ^ ~~~
   1 warning and 4 errors generated.


vim +/hv_isolation_type_en_snp +62 arch/x86/include/asm/mshyperv.h

    54	
    55	static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
    56	{
    57		u64 input_address = input ? virt_to_phys(input) : 0;
    58		u64 output_address = output ? virt_to_phys(output) : 0;
    59		u64 hv_status;
    60	
    61	#ifdef CONFIG_X86_64
  > 62		if (hv_isolation_type_en_snp()) {
    63			__asm__ __volatile__("mov %4, %%r8\n"
    64					     "vmmcall"
    65					     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
    66					       "+c" (control), "+d" (input_address)
    67					     :  "r" (output_address)
    68					     : "cc", "memory", "r8", "r9", "r10", "r11");
    69		} else {
    70			if (!hv_hypercall_pg)
    71				return U64_MAX;
    72	
    73			__asm__ __volatile__("mov %4, %%r8\n"
    74					     CALL_NOSPEC
    75					     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
    76					       "+c" (control), "+d" (input_address)
    77					     :  "r" (output_address),
    78						THUNK_TARGET(hv_hypercall_pg)
    79					     : "cc", "memory", "r8", "r9", "r10", "r11");
    80		}
    81	#else
    82		u32 input_address_hi = upper_32_bits(input_address);
    83		u32 input_address_lo = lower_32_bits(input_address);
    84		u32 output_address_hi = upper_32_bits(output_address);
    85		u32 output_address_lo = lower_32_bits(output_address);
    86	
    87		if (!hv_hypercall_pg)
    88			return U64_MAX;
    89	
    90		__asm__ __volatile__(CALL_NOSPEC
    91				     : "=A" (hv_status),
    92				       "+c" (input_address_lo), ASM_CALL_CONSTRAINT
    93				     : "A" (control),
    94				       "b" (input_address_hi),
    95				       "D"(output_address_hi), "S"(output_address_lo),
    96				       THUNK_TARGET(hv_hypercall_pg)
    97				     : "cc", "memory");
    98	#endif /* !x86_64 */
    99		return hv_status;
   100	}
   101	

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