Hi David, FYI, kernel build failed on tree: git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-modsign.git modsign-rusty head: 9ed5e36054569a4bc81eac3da446982df351d615 commit: 580088fd552331ef562cf82a29f53559ee5c508c [21/25] MODSIGN: Module signature verification config: cris-allyesconfig (attached as .config) All related error/warning messages: kernel/modsign-pubkey.c: In function 'module_verify_init': kernel/modsign-pubkey.c:46:2: error: implicit declaration of function 'IS_ERR' [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors -- kernel/module-verify.c: In function 'module_verify_signature': kernel/module-verify.c:68:2: error: implicit declaration of function 'IS_ERR' [-Werror=implicit-function-declaration] kernel/module-verify.c:69:3: error: implicit declaration of function 'PTR_ERR' [-Werror=implicit-function-declaration] kernel/module-verify.c:69:3: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'int' [-Wformat] cc1: some warnings being treated as errors vim +68 kernel/module-verify.c 65 * we will deadlock!!! 66 */ 67 mod_sig = verify_sig_begin(modsign_keyring, sig, sig_size); > 68 if (IS_ERR(mod_sig)) { 69 pr_err("Couldn't initiate module signature verification: %ld\n", 70 PTR_ERR(mod_sig)); 71 return PTR_ERR(mod_sig); --- 0-DAY kernel build testing backend Open Source Technology Centre Fengguang Wu Intel Corporation