Hi GONG, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 04473ee9ed912a16fff0d8846ad565bbf3d63c77 commit: 40151ef24c1a0f35c5e0442834eb776877e66683 [3547/3547] ima: rot: Prepare TPM as an RoT config: x86_64-randconfig-006-20251216 (https://download.01.org/0day-ci/archive/20251220/202512202204.7yVczgx9-lkp@i...) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251220/202512202204.7yVczgx9-lkp@i...) 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/202512202204.7yVczgx9-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

security/integrity/ima/ima_tpm.c:19:6: warning: no previous prototype for 'ima_pcrread' [-Wmissing-prototypes] 19 | void ima_pcrread(u32 idx, struct tpm_digest *d) | ^~~~~~~~~~~ security/integrity/ima/ima_tpm.c:28:5: warning: no previous prototype for 'ima_pcr_extend' [-Wmissing-prototypes] 28 | int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr) | ^~~~~~~~~~~~~~ security/integrity/ima/ima_tpm.c:41:5: warning: no previous prototype for 'ima_tpm_init' [-Wmissing-prototypes] 41 | int ima_tpm_init(struct ima_rot *rot) | ^~~~~~~~~~~~ security/integrity/ima/ima_tpm.c:53:5: warning: no previous prototype for 'ima_tpm_extend' [-Wmissing-prototypes] 53 | int ima_tpm_extend(struct tpm_digest *digests_arg, const void *args) | ^~~~~~~~~~~~~~ security/integrity/ima/ima_tpm.c:60:5: warning: no previous prototype for 'ima_tpm_calc_boot_aggregate' [-Wmissing-prototypes] 60 | int ima_tpm_calc_boot_aggregate(struct ima_digest_data *hash) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/ima_pcrread +19 security/integrity/ima/ima_tpm.c 18

19 void ima_pcrread(u32 idx, struct tpm_digest *d) 20 { 21 if (!ima_tpm_chip) 22 return; 23 24 if (tpm_pcr_read(ima_tpm_chip, idx, d) != 0) 25 pr_err("Error Communicating to TPM chip\n"); 26 } 27 28 int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr) 29 { 30 int result = 0; 31 32 if (!ima_tpm_chip) 33 return result; 34 35 result = tpm_pcr_extend(ima_tpm_chip, pcr, digests_arg); 36 if (result != 0) 37 pr_err("Error Communicating to TPM chip, result: %d\n", result); 38 return result; 39 } 40 41 int ima_tpm_init(struct ima_rot *rot) 42 { 43 ima_tpm_chip = tpm_default_chip(); 44 if (!ima_tpm_chip) 45 return -ENODEV; 46 47 rot->nr_allocated_banks = ima_tpm_chip->nr_allocated_banks; 48 rot->allocated_banks = ima_tpm_chip->allocated_banks; 49 50 return 0; 51 } 52 53 int ima_tpm_extend(struct tpm_digest *digests_arg, const void *args) 54 { 55 const int pcr = *(const int *)args; 56 57 return ima_pcr_extend(digests_arg, pcr); 58 } 59 60 int ima_tpm_calc_boot_aggregate(struct ima_digest_data *hash)

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