Hi Waiman,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on hnaz-linux-mm/master]
[also build test WARNING on linus/master v5.9-rc1 next-20200817]
[cannot apply to tip/sched/core]
[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/Waiman-Long/memcg-Enable-fine-grained-per-process-memory-control/20200817-221201
base:   https://github.com/hnaz/linux-mm master
config: x86_64-randconfig-s022-20200817 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-180-g49f7e13a-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


sparse warnings: (new ones prefixed by >>)

   fs/proc/base.c:2231:25: sparse: sparse: cast to restricted fmode_t
   fs/proc/base.c:2288:42: sparse: sparse: cast from restricted fmode_t
   fs/proc/base.c:2385:48: sparse: sparse: cast from restricted fmode_t
>> fs/proc/base.c:3244:30: sparse: sparse: symbol 'proc_memctl_operations' was not declared. Should it be static?
   fs/proc/base.c: note: in included file (through include/linux/rcuwait.h, include/linux/percpu-rwsem.h, include/linux/fs.h, ...):
   include/linux/sched/signal.h:695:37: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct spinlock [usertype] *lock @@     got struct spinlock [noderef] __rcu * @@
   include/linux/sched/signal.h:695:37: sparse:     expected struct spinlock [usertype] *lock
   include/linux/sched/signal.h:695:37: sparse:     got struct spinlock [noderef] __rcu *
   fs/proc/base.c:1104:36: sparse: sparse: context imbalance in '__set_oom_adj' - unexpected unlock

Please review and possibly fold the followup patch.

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