Re: [PATCH v6 2/4] ACPI: processor_idle: Add FFH state handling

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

Hi Patryk,

kernel test robot noticed the following build errors:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on rafael-pm/bleeding-edge acpi/next tip/x86/core linus/master v6.12 next-20241128]
[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/Patryk-Wlazlyn/x86-smp-Allow-calling-mwait_play_dead-with-an-arbitrary-hint/20241128-113851
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20241127161518.432616-3-patryk.wlazlyn%40linux.intel.com
patch subject: [PATCH v6 2/4] ACPI: processor_idle: Add FFH state handling
config: i386-buildonly-randconfig-002-20241128 (https://download.01.org/0day-ci/archive/20241128/202411282127.KFanck22-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241128/202411282127.KFanck22-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/202411282127.KFanck22-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kernel/acpi/cstate.c:213:2: error: call to undeclared function 'mwait_play_dead_with_hint'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     213 |         mwait_play_dead_with_hint(percpu_entry->states[cx->index].eax);
         |         ^
   1 error generated.


vim +/mwait_play_dead_with_hint +213 arch/x86/kernel/acpi/cstate.c

   206	
   207	void acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx)
   208	{
   209		unsigned int cpu = smp_processor_id();
   210		struct cstate_entry *percpu_entry;
   211	
   212		percpu_entry = per_cpu_ptr(cpu_cstate_entry, cpu);
 > 213		mwait_play_dead_with_hint(percpu_entry->states[cx->index].eax);
   214	}
   215	

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