Hi Ricardo, [auto build test WARNING on tip/auto-latest] [also build test WARNING on next-20161223] [cannot apply to tip/x86/core v4.9] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Ricardo-Neri/x86-enable-User-Mode-Instruction-Prevention/20161224-094338 config: x86_64-acpi-redef (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): arch/x86/kernel/umip.c: In function '__identify_insn': >> arch/x86/kernel/umip.c:65:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ vim +65 arch/x86/kernel/umip.c 78301541 Ricardo Neri 2016-12-23 49 return UMIP_SGDT; 78301541 Ricardo Neri 2016-12-23 50 case 1: 78301541 Ricardo Neri 2016-12-23 51 return UMIP_SIDT; 78301541 Ricardo Neri 2016-12-23 52 case 4: 78301541 Ricardo Neri 2016-12-23 53 return UMIP_SMSW; 78301541 Ricardo Neri 2016-12-23 54 default: 78301541 Ricardo Neri 2016-12-23 55 return -EINVAL; 78301541 Ricardo Neri 2016-12-23 56 } 78301541 Ricardo Neri 2016-12-23 57 } else if (insn->opcode.bytes[1] == 0x0) { 78301541 Ricardo Neri 2016-12-23 58 if (X86_MODRM_REG(insn->modrm.value) == 0) 78301541 Ricardo Neri 2016-12-23 59 return UMIP_SLDT; 78301541 Ricardo Neri 2016-12-23 60 else if (X86_MODRM_REG(insn->modrm.value) == 1) 78301541 Ricardo Neri 2016-12-23 61 return UMIP_STR; 78301541 Ricardo Neri 2016-12-23 62 else 78301541 Ricardo Neri 2016-12-23 63 return -EINVAL; 78301541 Ricardo Neri 2016-12-23 64 } 78301541 Ricardo Neri 2016-12-23 @65 } 78301541 Ricardo Neri 2016-12-23 66 78301541 Ricardo Neri 2016-12-23 67 static int __emulate_umip_insn(struct insn *insn, enum umip_insn umip_inst, 78301541 Ricardo Neri 2016-12-23 68 unsigned char *data, int *data_size) 78301541 Ricardo Neri 2016-12-23 69 { 78301541 Ricardo Neri 2016-12-23 70 unsigned long const *dummy_base_addr; 78301541 Ricardo Neri 2016-12-23 71 unsigned short dummy_limit = 0; 78301541 Ricardo Neri 2016-12-23 72 unsigned short dummy_value = 0; 78301541 Ricardo Neri 2016-12-23 73 :::::: The code at line 65 was first introduced by commit :::::: 7830154191c35fde49ef59c2b9328f6b32203be4 x86: Add emulation code for UMIP instructions :::::: TO: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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