[kbuild-all] Re: [PATCH 1/3] arm64: armv8_deprecated: Fix swp_handler() signal generation

Hi Liam, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on arm64/for-next/core] [also build test WARNING on arm-perf/for-next/perf xlnx/master arm/for-next soc/for-next kvmarm/next linus/master v5.12-rc8 next-20210420] [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/Liam-Howlett/arm64-armv8_depreca... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/96a011695861072d32851ba3a104b1910... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Liam-Howlett/arm64-armv8_deprecated-Fix-swp_handler-signal-generation/20210421-005252 git checkout 96a011695861072d32851ba3a104b19106955869 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/arm64/kernel/armv8_deprecated.c: In function 'swp_handler': 418 | else if (res = -ENXIO) /* Unaligned pointer */ | ^~~ vim +418 arch/arm64/kernel/armv8_deprecated.c 365 366 /* 367 * swp_handler logs the id of calling process, dissects the instruction, sanity 368 * checks the memory location, calls emulate_swpX for the actual operation and 369 * deals with fixup/error handling before returning 370 */ 371 static int swp_handler(struct pt_regs *regs, u32 instr) 372 { 373 u32 destreg, data, type, address = 0; 374 const void __user *user_ptr; 375 int rn, rt2, res = 0; 376 377 perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc); 378 379 type = instr & TYPE_SWPB; 380 381 switch (aarch32_check_condition(instr, regs->pstate)) { 382 case ARM_OPCODE_CONDTEST_PASS: 383 break; 384 case ARM_OPCODE_CONDTEST_FAIL: 385 /* Condition failed - return to next instruction */ 386 goto ret; 387 case ARM_OPCODE_CONDTEST_UNCOND: 388 /* If unconditional encoding - not a SWP, undef */ 389 return -EFAULT; 390 default: 391 return -EINVAL; 392 } 393 394 rn = aarch32_insn_extract_reg_num(instr, A32_RN_OFFSET); 395 rt2 = aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET); 396 397 address = (u32)regs->user_regs.regs[rn]; 398 data = (u32)regs->user_regs.regs[rt2]; 399 destreg = aarch32_insn_extract_reg_num(instr, A32_RT_OFFSET); 400 401 pr_debug("addr in r%d->0x%08x, dest is r%d, source in r%d->0x%08x)\n", 402 rn, address, destreg, 403 aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET), data); 404 405 /* Check access in reasonable access range for both SWP and SWPB */ 406 user_ptr = (const void __user *)(unsigned long)(address & ~3); 407 if (!access_ok(user_ptr, 4)) { 408 pr_debug("SWP{B} emulation: access to 0x%08x not allowed!\n", 409 address); 410 goto e_access; 411 } 412 413 res = emulate_swpX(address, &data, type); 414 if (!res) 415 regs->user_regs.regs[destreg] = data; 416 else if (res == -EFAULT) 417 goto e_fault; 419 goto e_align; 420 421 ret: 422 if (type == TYPE_SWPB) 423 trace_instruction_emulation("swpb", regs->pc); 424 else 425 trace_instruction_emulation("swp", regs->pc); 426 427 pr_warn_ratelimited("\"%s\" (%ld) uses obsolete SWP{B} instruction at 0x%llx\n", 428 current->comm, (unsigned long)current->pid, regs->pc); 429 430 arm64_skip_faulting_instruction(regs, 4); 431 return 0; 432 433 e_fault: 434 pr_debug("SWP{B} emulation: access caused memory abort!\n"); 435 arm64_notify_segfault(address); 436 return 0; 437 438 e_align: 439 e_access: 440 force_signal_inject(SIGSEGV, SEGV_ACCERR, address, 0); 441 return 0; 442 } 443 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org