[linux-next:master 16504/16703] include/linux/tpm_command.h:515:2: warning: field within 'struct tpm_header' is less aligned than 'union tpm_header::(anonymous at include/linux/tpm_command.h:515:2)' and is usually due to 'struct tpm_header' being packed, which can lead to unaligned acc...

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   903c1cf6dff9964e71eda98a39e2e5d442050472
commit: 80d179c799e06db3a0ded6fdd71f292d9bef3fa5 [16504/16703] tpm: Move TPM common base definitions to the command header
config: arm-randconfig-002-20260823 (https://download.01.org/0day-ci/archive/20260823/[email protected]/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 935bfc708590c60147a79c7df145bb6e68b1d388)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260823/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

   In file included from drivers/char/tpm/tpm_i2c_atmel.c:23:
   In file included from drivers/char/tpm/tpm.h:28:
   In file included from include/linux/tpm.h:28:
>> include/linux/tpm_command.h:515:2: warning: field  within 'struct tpm_header' is less aligned than 'union tpm_header::(anonymous at include/linux/tpm_command.h:515:2)' and is usually due to 'struct tpm_header' being packed, which can lead to unaligned accesses [-Wunaligned-access]
     515 |         union {
         |         ^
   1 warning generated.


vim +515 include/linux/tpm_command.h

   511	
   512	struct tpm_header {
   513		__be16 tag;
   514		__be32 length;
 > 515		union {
   516			__be32 ordinal;
   517			__be32 return_code;
   518		};
   519	} __packed;
   520	

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