Re: [V2][PATCH] selftests/x86: Fix error: variably modified 'altstack_data' at file scope

[kernel test robot]

Hi Jun,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kselftest/next]
[also build test ERROR on v5.14-rc7 next-20210823]
[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/Jun-Miao/selftests-x86-Fix-error-variably-modified-altstack_data-at-file-scope/20210823-215819
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
config: x86_64-rhel-8.3-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/3752736483bd2f09d350c5d3a42460d74ea9c53a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jun-Miao/selftests-x86-Fix-error-variably-modified-altstack_data-at-file-scope/20210823-215819
        git checkout 3752736483bd2f09d350c5d3a42460d74ea9c53a
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash -C tools/testing/selftests install

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   single_step_syscall.c: In function 'main':
>> single_step_syscall.c:230:7: error: 'stack' undeclared (first use in this function); did you mean 'stack_t'?
     230 |  free(stack.ss_sp);
         |       ^~~~~
         |       stack_t
   single_step_syscall.c:230:7: note: each undeclared identifier is reported only once for each function it appears in
--
   mov_ss_trap.c: In function 'main':
>> mov_ss_trap.c:284:7: error: 'stack' undeclared (first use in this function); did you mean 'obstack'?
     284 |  free(stack.ss_sp);
         |       ^~~~~
         |       obstack
   mov_ss_trap.c:284:7: note: each undeclared identifier is reported only once for each function it appears in

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

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