Re: [RFC][PATCH 07/24] x86/entry: Fill ESPFIX stack using C code

[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 next-20201110]
[cannot apply to tip/x86/core tip/x86/asm]
[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-r025-20201110 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 4d81c8adb6ed9840257f6cb6b93f60856d422a15)
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/b4ba46ed57b20498647b180c755359e4156a5f57
        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 b4ba46ed57b20498647b180c755359e4156a5f57
        # 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 >>):

   In file included from arch/x86/kernel/espfix_64.c:36:
   arch/x86/include/asm/entry-common.h:42:24: error: implicit declaration of function 'task_stack_page' [-Werror,-Wimplicit-function-declaration]
                   WARN_ON_ONCE(regs != task_pt_regs(current));
                                        ^
   arch/x86/include/asm/processor.h:774:39: note: expanded from macro 'task_pt_regs'
           unsigned long __ptr = (unsigned long)task_stack_page(task);     \
                                                ^
>> arch/x86/kernel/espfix_64.c:222:23: warning: no previous prototype for function 'fill_espfix_stack' [-Wmissing-prototypes]
   noinstr unsigned long fill_espfix_stack(struct iret_rax_frame *frame)
                         ^
   arch/x86/kernel/espfix_64.c:222:9: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinstr unsigned long fill_espfix_stack(struct iret_rax_frame *frame)
           ^
           static 
   1 warning and 1 error generated.

vim +/fill_espfix_stack +222 arch/x86/kernel/espfix_64.c

   221	
 > 222	noinstr unsigned long fill_espfix_stack(struct iret_rax_frame *frame)

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

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