Re: [PATCH 4/4] tpm: Move TPM common base definitions to the command header

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

Hi Alec,

kernel test robot noticed the following build warnings:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v7.0-rc4 next-20260320]
[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/Alec-Brown/tpm-Initial-step-to-reorganize-TPM-public-headers/20260322-021741
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20260317160613.2899129-5-alec.r.brown%40oracle.com
patch subject: [PATCH 4/4] tpm: Move TPM common base definitions to the command header
config: arm-randconfig-r132-20260322 (https://download.01.org/0day-ci/archive/20260322/202603220920.LNzslwgU-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 4abb927bacf37f18f6359a41639a6d1b3bffffb5)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260322/202603220920.LNzslwgU-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/202603220920.LNzslwgU-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/char/tpm/tpm-dev-common.c:19:
   In file included from drivers/char/tpm/tpm.h:29:
   include/linux/tpm_eventlog.h:167:6: warning: variable 'mapping_size' set but not used [-Wunused-but-set-variable]
     167 |         int mapping_size;
         |             ^
   In file included from drivers/char/tpm/tpm-dev-common.c:19:
   In file included from drivers/char/tpm/tpm.h:28:
   In file included from include/linux/tpm.h:28:
>> include/linux/tpm_command.h:517:2: warning: field  within 'struct tpm_header' is less aligned than 'union tpm_header::(anonymous at include/linux/tpm_command.h:517:2)' and is usually due to 'struct tpm_header' being packed, which can lead to unaligned accesses [-Wunaligned-access]
     517 |         union {
         |         ^
   2 warnings generated.
--
   In file included from drivers/char/tpm/tpm-buf.c:7:
   In file included from include/linux/tpm.h:28:
>> include/linux/tpm_command.h:517:2: warning: field  within 'struct tpm_header' is less aligned than 'union tpm_header::(anonymous at include/linux/tpm_command.h:517:2)' and is usually due to 'struct tpm_header' being packed, which can lead to unaligned accesses [-Wunaligned-access]
     517 |         union {
         |         ^
   1 warning generated.


vim +517 include/linux/tpm_command.h

   513	
   514	struct tpm_header {
   515		__be16 tag;
   516		__be32 length;
 > 517		union {
   518			__be32 ordinal;
   519			__be32 return_code;
   520		};
   521	} __packed;
   522	

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