Re: [PATCH v3 3/3] kselftest: Provide __cpuid_count() stub on non-x86 archs

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

Hi Ilpo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on shuah-kselftest/next]
[also build test WARNING on shuah-kselftest/fixes linus/master v6.11-rc5 next-20240830]
[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/Ilpo-J-rvinen/selftests-resctrl-Generalize-non-contiguous-CAT-check/20240829-212248
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
patch link:    https://lore.kernel.org/r/20240829131657.1917-4-ilpo.jarvinen%40linux.intel.com
patch subject: [PATCH v3 3/3] kselftest: Provide __cpuid_count() stub on non-x86 archs
:::::: branch date: 3 days ago
:::::: commit date: 3 days ago
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/20240901/202409010931.Xl6TB9hc-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/r/202409010931.Xl6TB9hc-lkp@intel.com/

All warnings (new ones prefixed by >>):

   corrupt_xstate_header.c: In function 'xsave_enabled':
>> corrupt_xstate_header.c:29:20: warning: 'ecx' is used uninitialized [-Wuninitialized]
      29 |         return ecx & (1U << 27);
         |                ~~~~^~~~~~~~~~~~
   corrupt_xstate_header.c:24:32: note: 'ecx' was declared here
      24 |         unsigned int eax, ebx, ecx, edx;
         |                                ^~~
--
   amx.c: In function 'check_cpuid_xtiledata':
>> amx.c:123:19: warning: 'ebx' is used uninitialized [-Wuninitialized]
     123 |         xbuf_size = ebx;
         |         ~~~~~~~~~~^~~~~
   amx.c:111:23: note: 'ebx' was declared here
     111 |         uint32_t eax, ebx, ecx, edx;
         |                       ^~~
>> amx.c:131:13: warning: 'eax' is used uninitialized [-Wuninitialized]
     131 |         if (!eax || !ebx)
         |             ^~~~
   amx.c:111:18: note: 'eax' was declared here
     111 |         uint32_t eax, ebx, ecx, edx;
         |                  ^~~
--
   lam.c: In function 'cpu_has_lam':
>> lam.c:124:24: warning: 'cpuinfo' is used uninitialized [-Wuninitialized]
     124 |         return (cpuinfo[0] & (1 << 26));
         |                 ~~~~~~~^~~
   lam.c:120:22: note: 'cpuinfo' declared here
     120 |         unsigned int cpuinfo[4];
         |                      ^~~~~~~
   lam.c: In function 'cpu_has_la57':
   lam.c:134:24: warning: 'cpuinfo' is used uninitialized [-Wuninitialized]
     134 |         return (cpuinfo[2] & (1 << 16));
         |                 ~~~~~~~^~~
   lam.c:130:22: note: 'cpuinfo' declared here
     130 |         unsigned int cpuinfo[4];
         |                      ^~~~~~~


vim +/ecx +29 tools/testing/selftests/x86/corrupt_xstate_header.c

b7c11876d24bdd7 Andy Lutomirski 2021-06-08  21  
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  22  static inline int xsave_enabled(void)
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  23  {
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  24  	unsigned int eax, ebx, ecx, edx;
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  25  
170d1c23f2a3569 Reinette Chatre 2022-04-25  26  	__cpuid_count(0x1, 0x0, eax, ebx, ecx, edx);
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  27  
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  28  	/* Is CR4.OSXSAVE enabled ? */
b7c11876d24bdd7 Andy Lutomirski 2021-06-08 @29  	return ecx & (1U << 27);
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  30  }
b7c11876d24bdd7 Andy Lutomirski 2021-06-08  31  

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