Hi, On Fri, 9 Feb 2018 00:30:20 +0000 "Hao, Shun" <shun....@intel.com> wrote:
> Thanks Masami, so that explains why a lot of these warnings come out just > after > we upgrading to gcc-7.3 (now the objdump version is 2.30). > Currently we've already ignore these warnings and won't send this report. Anyway, it must be fixed with the below patch. https://lkml.org/lkml/2018/2/8/350 (Sorry, I replyed to another warning mail) Thank you, > > >-----Original Message----- > >From: kbuild-all [mailto:kbuild-all-boun...@lists.01.org] On Behalf Of Masami > >Hiramatsu > >Sent: Thursday, February 8, 2018 10:34 PM > >To: Wu, Fengguang <fengguang...@intel.com> > >Cc: Ingo Molnar <mi...@kernel.org>; kbuild-...@01.org; linux- > >ker...@vger.kernel.org > >Subject: Re: [kbuild-all] arch/x86/tools/insn_decoder_test: warning: > >ffffffff810005ac: > >0f ff e9 ud0 %ecx, %ebp > > > >On Thu, 8 Feb 2018 06:04:45 +0800 > >kbuild test robot <fengguang...@intel.com> wrote: > > > >> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > >> master > >> head: 7590e37bdaeec25ae325f4ba450be13e2aac6c8d > >> commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize > >output format of insn_decode_test > >> date: 8 weeks ago > >> config: x86_64-randconfig-s2-02072130 (attached as .config) > >> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026 > >> reproduce: > >> git checkout 10c91577d5e631773a6394e14cf60125389b71ae > >> # save the attached .config to linux build tree > >> make ARCH=x86_64 > >> > >> All warnings (new ones prefixed by >>): > >> > >> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction > >> decoder bug, > >please report this. > >> >> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 > > ud0 %ecx,%ebp > > > >Does UD0 really take an operand? Hmm, indeed, the latest Intel SDM > >(December2017) > >says > > > >NOTES: > >1. Some older processors decode the UD0 instruction without a ModR/M byte. > >As a > >result, those processors would deliver an invalid- > >opcode exception instead of a fault on instruction fetch when the > >instruction with a > >ModR/M byte (and any implied bytes) would > >cross a page or segment boundary. > > > >and older SDM (e.g. March 2017) says UD0 has no modrm byte. > >It is easy to change x86-opecode-map.txt, but this means this test may fail > >with older > >objdump... > > > >> > >> --- > >> 0-DAY kernel test infrastructure Open Source Technology > >> Center > >> https://lists.01.org/pipermail/kbuild-all Intel > >> Corporation > > > > > >-- > >Masami Hiramatsu <mhira...@kernel.org> > >_______________________________________________ > >kbuild-all mailing list > >kbuild-...@lists.01.org > >https://lists.01.org/mailman/listinfo/kbuild-all -- Masami Hiramatsu <mhira...@kernel.org>
