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SubjectRe: [v2 7/7] x86: Enable User-Mode Instruction Prevention
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@linux.intel.com>
:::::: CC: 0day robot <fengguang.wu@intel.com>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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