Re: [PATCH v6 2/3] x86/tdx: Fix arch_safe_halt() execution for TDX VMs

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

Hi Vishal,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on tip/master linus/master v6.14-rc4 next-20250227]
[cannot apply to tip/x86/tdx tip/auto-latest]
[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/Vishal-Annapurve/x86-paravirt-Move-halt-paravirt-calls-under-CONFIG_PARAVIRT/20250225-085043
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20250225004704.603652-3-vannapurve%40google.com
patch subject: [PATCH v6 2/3] x86/tdx: Fix arch_safe_halt() execution for TDX VMs
config: i386-buildonly-randconfig-003-20250227 (https://download.01.org/0day-ci/archive/20250227/202502272346.iiQ6Dptt-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250227/202502272346.iiQ6Dptt-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/202502272346.iiQ6Dptt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/process.c:6:
   In file included from include/linux/mm.h:2224:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/kernel/process.c:937:32: error: use of undeclared identifier 'tdx_halt'; did you mean 'tdx_init'?
     937 |                 static_call_update(x86_idle, tdx_halt);
         |                                              ^~~~~~~~
         |                                              tdx_init
   include/linux/static_call.h:154:42: note: expanded from macro 'static_call_update'
     154 |         typeof(&STATIC_CALL_TRAMP(name)) __F = (func);                  \
         |                                                 ^
   arch/x86/include/asm/tdx.h:123:20: note: 'tdx_init' declared here
     123 | static inline void tdx_init(void) { }
         |                    ^
   2 warnings and 1 error generated.


vim +937 arch/x86/kernel/process.c

   919	
   920	void __init select_idle_routine(void)
   921	{
   922		if (boot_option_idle_override == IDLE_POLL) {
   923			if (IS_ENABLED(CONFIG_SMP) && __max_threads_per_core > 1)
   924				pr_warn_once("WARNING: polling idle and HT enabled, performance may degrade\n");
   925			return;
   926		}
   927	
   928		/* Required to guard against xen_set_default_idle() */
   929		if (x86_idle_set())
   930			return;
   931	
   932		if (prefer_mwait_c1_over_halt()) {
   933			pr_info("using mwait in idle threads\n");
   934			static_call_update(x86_idle, mwait_idle);
   935		} else if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) {
   936			pr_info("using TDX aware idle routine\n");
 > 937			static_call_update(x86_idle, tdx_halt);
   938		} else {
   939			static_call_update(x86_idle, default_idle);
   940		}
   941	}
   942	

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