Hi Sean,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on next-20201208]
[also build test WARNING on v5.10-rc7]
[cannot apply to drm-intel/for-linux-next char-misc/char-misc-testing v5.10-rc7 v5.10-rc6 v5.10-rc5]
[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/Huang-Sean-Z/Introduce-Intel-PXP-component-Mesa-single-session/20201209-150546
base:    a9e26cb5f2615cd638f911ea96d4fff5b4d93690
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/b7688bb5d268b7777bfef3a17d5cbde5e843e215
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Huang-Sean-Z/Introduce-Intel-PXP-component-Mesa-single-session/20201209-150546
        git checkout b7688bb5d268b7777bfef3a17d5cbde5e843e215
        # save the attached .config to linux build tree
        make W=1 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 >>):

>> drivers/gpu/drm/i915/pxp/intel_pxp_arb.c:80:5: warning: no previous prototype for 'intel_pxp_arb_reserve_session' [-Wmissing-prototypes]
      80 | int intel_pxp_arb_reserve_session(struct intel_pxp *pxp)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/intel_pxp_arb_reserve_session +80 drivers/gpu/drm/i915/pxp/intel_pxp_arb.c

    79	
  > 80	int intel_pxp_arb_reserve_session(struct intel_pxp *pxp)
    81	{
    82		int ret;
    83		struct pxp_protected_session *session = NULL;
    84	
    85		lockdep_assert_held(&pxp->ctx.mutex);
    86	
    87		ret = wait_arb_hw_sw_state(pxp);
    88		if (ret)
    89			return ret;
    90	
    91		session = create_session_entry(pxp);
    92		if (!session)
    93			return -ENOMEM;
    94	
    95		return ret;
    96	}
    97	

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