Messages in this thread | | | Date | Fri, 19 Nov 2021 12:35:36 +0800 | From | kernel test robot <> | Subject | [joro:x86-testing 39/45] arch/x86/kernel/sev.c:2027:26: warning: no previous prototype for 'snp_find_cc_blob' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git x86-testing head: 139c88cae82e33dfd6e49ecc4b015a5c7d39c80a commit: d35494e7aba4b3a2e7b1c9be9add9968be6d8ffd [39/45] x86/sev: add SEV-SNP feature detection/setup config: x86_64-buildonly-randconfig-r005-20211115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=d35494e7aba4b3a2e7b1c9be9add9968be6d8ffd git remote add joro https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git git fetch --no-tags joro x86-testing git checkout d35494e7aba4b3a2e7b1c9be9add9968be6d8ffd # save the attached .config to linux build tree make W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> arch/x86/kernel/sev.c:2027:26: warning: no previous prototype for 'snp_find_cc_blob' [-Wmissing-prototypes] 2027 | struct cc_blob_sev_info *snp_find_cc_blob(struct boot_params *bp) | ^~~~~~~~~~~~~~~~
vim +/snp_find_cc_blob +2027 arch/x86/kernel/sev.c
2013 2014 /* 2015 * Initial set up of SEV-SNP relies on information provided by the 2016 * Confidential Computing blob, which can be passed to the kernel 2017 * in the following ways, depending on how it is booted: 2018 * 2019 * - when booted via the boot/decompress kernel: 2020 * - via boot_params 2021 * 2022 * - when booted directly by firmware/bootloader (e.g. CONFIG_PVH): 2023 * - via a setup_data entry, as defined by the Linux Boot Protocol 2024 * 2025 * Scan for the blob in that order. 2026 */ > 2027 struct cc_blob_sev_info *snp_find_cc_blob(struct boot_params *bp) 2028 { 2029 struct cc_blob_sev_info *cc_info; 2030 2031 /* Boot kernel would have passed the CC blob via boot_params. */ 2032 if (bp->cc_blob_address) { 2033 cc_info = (struct cc_blob_sev_info *) 2034 (unsigned long)bp->cc_blob_address; 2035 goto found_cc_info; 2036 } 2037 2038 /* 2039 * If kernel was booted directly, without the use of the 2040 * boot/decompression kernel, the CC blob may have been passed via 2041 * setup_data instead. 2042 */ 2043 cc_info = snp_find_cc_blob_setup_data(bp); 2044 if (!cc_info) 2045 return NULL; 2046 2047 found_cc_info: 2048 if (cc_info->magic != CC_BLOB_SEV_HDR_MAGIC) 2049 sev_es_terminate(1, GHCB_SNP_UNSUPPORTED); 2050 2051 return cc_info; 2052 } 2053
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