[PATCH v2] lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()

[kernel test robot]

Hi Vlastimil,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on linux/master linus/master v5.15-rc5]
[cannot apply to hnaz-mm/master next-20211012]
[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/Vlastimil-Babka/lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc/20211012-170816
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-randconfig-s021-20211012 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/0day-ci/linux/commit/1cd8ce52c520c26c513899fb5aee42b8e5f60d0d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vlastimil-Babka/lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc/20211012-170816
        git checkout 1cd8ce52c520c26c513899fb5aee42b8e5f60d0d
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>


sparse warnings: (new ones prefixed by >>)
>> lib/stackdepot.c:150:1: sparse: sparse: symbol 'stack_depot_init_mutex' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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