[PATCH v8 14/15] x86: Secure Launch late initcall platform module

[kernel test robot]

Hi Ross,

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 herbert-cryptodev-2.6/master herbert-crypto-2.6/master linus/master v6.8-rc4 next-20240215]
[cannot apply to tip/x86/core]
[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/Ross-Philipson/x86-boot-Place-kernel_info-at-a-fixed-offset/20240215-064712
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20240214221847.2066632-15-ross.philipson%40oracle.com
patch subject: [PATCH v8 14/15] x86: Secure Launch late initcall platform module
config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20240216/202402160909.BRTtBK7T-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240216/202402160909.BRTtBK7T-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402160909.BRTtBK7T-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/kernel/slmodule.c:28:
   In file included from include/linux/slaunch.h:185:
   include/linux/tpm_eventlog.h:167:6: warning: variable 'mapping_size' set but not used [-Wunused-but-set-variable]
     167 |         int mapping_size;
         |             ^
>> arch/x86/kernel/slmodule.c:352:4: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     352 |                         default:
         |                         ^
   arch/x86/kernel/slmodule.c:352:4: note: insert 'break;' to avoid fall-through
     352 |                         default:
         |                         ^
         |                         break; 
   2 warnings generated.


vim +352 arch/x86/kernel/slmodule.c

   313	
   314	static void slaunch_tpm20_extend_event(struct tpm_chip *tpm, void __iomem *txt,
   315					       struct tcg_pcr_event2_head *event)
   316	{
   317		u16 *alg_id_field = (u16 *)((u8 *)event + sizeof(struct tcg_pcr_event2_head));
   318		struct tpm_digest *digests;
   319		u8 *dptr;
   320		u32 i, j;
   321		int ret;
   322	
   323		digests = kcalloc(tpm->nr_allocated_banks, sizeof(*digests),
   324				  GFP_KERNEL);
   325		if (!digests)
   326			slaunch_txt_reset(txt, "Failed to allocate array of digests\n",
   327					  SL_ERROR_GENERIC);
   328	
   329		for (i = 0; i < tpm->nr_allocated_banks; i++)
   330			digests[i].alg_id = tpm->allocated_banks[i].alg_id;
   331	
   332		/* Early SL code ensured there was a max count of 2 digests */
   333		for (i = 0; i < event->count; i++) {
   334			dptr = (u8 *)alg_id_field + sizeof(u16);
   335	
   336			for (j = 0; j < tpm->nr_allocated_banks; j++) {
   337				if (digests[j].alg_id != *alg_id_field)
   338					continue;
   339	
   340				switch (digests[j].alg_id) {
   341				case TPM_ALG_SHA256:
   342					memcpy(&digests[j].digest[0], dptr,
   343					       SHA256_DIGEST_SIZE);
   344					alg_id_field = (u16 *)((u8 *)alg_id_field +
   345						SHA256_DIGEST_SIZE + sizeof(u16));
   346					break;
   347				case TPM_ALG_SHA1:
   348					memcpy(&digests[j].digest[0], dptr,
   349					       SHA1_DIGEST_SIZE);
   350					alg_id_field = (u16 *)((u8 *)alg_id_field +
   351						SHA1_DIGEST_SIZE + sizeof(u16));
 > 352				default:
   353					break;
   354				}
   355			}
   356		}
   357	
   358		ret = tpm_pcr_extend(tpm, event->pcr_idx, digests);
   359		if (ret) {
   360			pr_err("Error extending TPM20 PCR, result: %d\n", ret);
   361			slaunch_txt_reset(txt, "Failed to extend TPM20 PCR\n",
   362					  SL_ERROR_TPM_EXTEND);
   363		}
   364	
   365		kfree(digests);
   366	}
   367	

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