Re: [RFC][PATCH 21/24] x86/entry: Disable stack-protector for IST entry C handlers

[kernel test robot <lkp@intel.com>]

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Hi Alexandre,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on tip/x86/mm]
[also build test WARNING on v5.10-rc3]
[cannot apply to tip/x86/core tip/x86/asm next-20201112]
[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/Alexandre-Chartre/x86-pti-Defer-CR3-switch-to-C-code/20201109-225007
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 1fcd009102ee02e217f2e7635ab65517d785da8e
config: x86_64-randconfig-a011-20201109 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 09ec07827b1128504457a93dee80b2ceee1af600)
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/1095b6a7acb8dc568c474cd3b3d1c8393fb49728
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alexandre-Chartre/x86-pti-Defer-CR3-switch-to-C-code/20201109-225007
        git checkout 1095b6a7acb8dc568c474cd3b3d1c8393fb49728
        # 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 <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/cpu/mce/core.c:2023:1: warning: unknown attribute 'optimize' ignored [-Wunknown-attributes]
   DEFINE_IDTENTRY_MCE(exc_machine_check)
   ^
   arch/x86/include/asm/idtentry.h:539:30: note: expanded from macro 'DEFINE_IDTENTRY_MCE'
   #define DEFINE_IDTENTRY_MCE             DEFINE_IDTENTRY_IST
                                           ^
   arch/x86/include/asm/idtentry.h:428:2: note: expanded from macro 'DEFINE_IDTENTRY_IST'
           no_stack_protector DEFINE_IDTENTRY_RAW(func)
           ^
   arch/x86/include/asm/idtentry.h:110:18: note: expanded from macro 'no_stack_protector'
           __attribute__ ((optimize("-O2,-fno-stack-protector,-fno-omit-frame-pointer")))
                           ^
   1 warning generated.

vim +/optimize +2023 arch/x86/kernel/cpu/mce/core.c

4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2020  
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2021  #ifdef CONFIG_X86_64
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2022  /* MCE hit kernel mode */
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25 @2023  DEFINE_IDTENTRY_MCE(exc_machine_check)
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2024  {
cd840e424f27fc arch/x86/kernel/cpu/mce/core.c   Peter Zijlstra  2020-05-29  2025  	unsigned long dr7;
cd840e424f27fc arch/x86/kernel/cpu/mce/core.c   Peter Zijlstra  2020-05-29  2026  
cd840e424f27fc arch/x86/kernel/cpu/mce/core.c   Peter Zijlstra  2020-05-29  2027  	dr7 = local_db_save();
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2028  	exc_machine_check_kernel(regs);
cd840e424f27fc arch/x86/kernel/cpu/mce/core.c   Peter Zijlstra  2020-05-29  2029  	local_db_restore(dr7);
4c0dcd8350a03c arch/x86/kernel/cpu/mce/core.c   Thomas Gleixner 2020-02-25  2030  }
9eda8cb3ac2352 arch/x86/kernel/cpu/mcheck/mce.c Andi Kleen      2009-07-09  2031  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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