Hi Borislav, I love your patch! Perhaps something to improve:
[auto build test WARNING on linus/master] [also build test WARNING on v5.10 next-20201223] [cannot apply to tip/perf/core tip/x86/core luto/next] [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] url: https://github.com/0day-ci/linux/commits/Borislav-Petkov/x86-insn-Add-an-insn_decode-API/20201224-014846 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 614cb5894306cfa2c7d9b6168182876ff5948735 config: x86_64-randconfig-a016-20201223 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/9cc93591504c88c42ab10903fc69062fc1461ed0 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Borislav-Petkov/x86-insn-Add-an-insn_decode-API/20201224-014846 git checkout 9cc93591504c88c42ab10903fc69062fc1461ed0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): >> arch/x86/kernel/sev-es.c:258:7: warning: variable 'ret' is used >> uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (!insn_decode_regs(&ctxt->insn, ctxt->regs, buffer, res)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/sev-es.c:272:6: note: uninitialized use occurs here if (ret < 0) ^~~ arch/x86/kernel/sev-es.c:258:3: note: remove the 'if' if its condition is always true if (!insn_decode_regs(&ctxt->insn, ctxt->regs, buffer, res)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/sev-es.c:247:14: note: initialize the variable 'ret' to silence this warning int res, ret; ^ = 0 1 warning generated. vim +258 arch/x86/kernel/sev-es.c f980f9c31a923e9 Joerg Roedel 2020-09-07 243 f980f9c31a923e9 Joerg Roedel 2020-09-07 244 static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt) f980f9c31a923e9 Joerg Roedel 2020-09-07 245 { f980f9c31a923e9 Joerg Roedel 2020-09-07 246 char buffer[MAX_INSN_SIZE]; 9cc93591504c88c Borislav Petkov 2020-12-23 247 int res, ret; f980f9c31a923e9 Joerg Roedel 2020-09-07 248 5e3427a7bc432ed Joerg Roedel 2020-09-07 249 if (user_mode(ctxt->regs)) { 5e3427a7bc432ed Joerg Roedel 2020-09-07 250 res = insn_fetch_from_user(ctxt->regs, buffer); 5e3427a7bc432ed Joerg Roedel 2020-09-07 251 if (!res) { 5e3427a7bc432ed Joerg Roedel 2020-09-07 252 ctxt->fi.vector = X86_TRAP_PF; 5e3427a7bc432ed Joerg Roedel 2020-09-07 253 ctxt->fi.error_code = X86_PF_INSTR | X86_PF_USER; 5e3427a7bc432ed Joerg Roedel 2020-09-07 254 ctxt->fi.cr2 = ctxt->regs->ip; 5e3427a7bc432ed Joerg Roedel 2020-09-07 255 return ES_EXCEPTION; 5e3427a7bc432ed Joerg Roedel 2020-09-07 256 } 5e3427a7bc432ed Joerg Roedel 2020-09-07 257 63d702bf108e3ad Borislav Petkov 2020-12-23 @258 if (!insn_decode_regs(&ctxt->insn, ctxt->regs, buffer, res)) 5e3427a7bc432ed Joerg Roedel 2020-09-07 259 return ES_DECODE_FAILED; 5e3427a7bc432ed Joerg Roedel 2020-09-07 260 } else { f980f9c31a923e9 Joerg Roedel 2020-09-07 261 res = vc_fetch_insn_kernel(ctxt, buffer); 5e3427a7bc432ed Joerg Roedel 2020-09-07 262 if (res) { f980f9c31a923e9 Joerg Roedel 2020-09-07 263 ctxt->fi.vector = X86_TRAP_PF; 5e3427a7bc432ed Joerg Roedel 2020-09-07 264 ctxt->fi.error_code = X86_PF_INSTR; f980f9c31a923e9 Joerg Roedel 2020-09-07 265 ctxt->fi.cr2 = ctxt->regs->ip; f980f9c31a923e9 Joerg Roedel 2020-09-07 266 return ES_EXCEPTION; f980f9c31a923e9 Joerg Roedel 2020-09-07 267 } f980f9c31a923e9 Joerg Roedel 2020-09-07 268 9cc93591504c88c Borislav Petkov 2020-12-23 269 ret = insn_decode(&ctxt->insn, buffer, MAX_INSN_SIZE - res, INSN_MODE_64); 5e3427a7bc432ed Joerg Roedel 2020-09-07 270 } f980f9c31a923e9 Joerg Roedel 2020-09-07 271 9cc93591504c88c Borislav Petkov 2020-12-23 272 if (ret < 0) 9cc93591504c88c Borislav Petkov 2020-12-23 273 return ES_DECODE_FAILED; 9cc93591504c88c Borislav Petkov 2020-12-23 274 else 9cc93591504c88c Borislav Petkov 2020-12-23 275 return ES_OK; f980f9c31a923e9 Joerg Roedel 2020-09-07 276 } f980f9c31a923e9 Joerg Roedel 2020-09-07 277 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
Description: application/gzip
