[ammarfaizi2-block:tj/cgroup/for-next 7/8] kernel/cgroup/cgroup.c:1310:32: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/ammarfaizi2/linux-block tj/cgroup/for-next
head:   c87b1452249c69cdec70d5de64ea81f56e1ba3f8
commit: 79276d9e0dda30071b9a98045a3efa7e0a76938b [7/8] cgroup: Make !percpu threadgroup_rwsem operations optional
config: hexagon-randconfig-r041-20220722 (https://download.01.org/0day-ci/archive/20220723/202207231608.bk36zznz-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 12fbd2d377e396ad61bce56d71c98a1eb1bebfa9)
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
        # https://github.com/ammarfaizi2/linux-block/commit/79276d9e0dda30071b9a98045a3efa7e0a76938b
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tj/cgroup/for-next
        git checkout 79276d9e0dda30071b9a98045a3efa7e0a76938b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash kernel/cgroup/

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

All error/warnings (new ones prefixed by >>):

>> kernel/cgroup/cgroup.c:1310:32: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
           bool favoring = root->flags & CGRP_ROOT_FAVOR_DYNMODS;
                                         ^
   kernel/cgroup/cgroup.c:1315:18: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   root->flags |= CGRP_ROOT_FAVOR_DYNMODS;
                                  ^
   kernel/cgroup/cgroup.c:1318:19: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   root->flags &= ~CGRP_ROOT_FAVOR_DYNMODS;
                                   ^
>> kernel/cgroup/cgroup.c:1308:6: warning: no previous prototype for function 'cgroup_favor_dynmods' [-Wmissing-prototypes]
   void cgroup_favor_dynmods(struct cgroup_root *root, bool favor)
        ^
   kernel/cgroup/cgroup.c:1308:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cgroup_favor_dynmods(struct cgroup_root *root, bool favor)
   ^
   static 
   kernel/cgroup/cgroup.c:1912:17: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   ctx->flags |= CGRP_ROOT_FAVOR_DYNMODS;
                                 ^
   kernel/cgroup/cgroup.c:1915:18: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   ctx->flags &= ~CGRP_ROOT_FAVOR_DYNMODS;
                                  ^
   kernel/cgroup/cgroup.c:1942:23: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                                        root_flags & CGRP_ROOT_FAVOR_DYNMODS);
                                                     ^
   kernel/cgroup/cgroup.c:1960:28: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
           if (cgrp_dfl_root.flags & CGRP_ROOT_FAVOR_DYNMODS)
                                     ^
   kernel/cgroup/cgroup.c:2013:30: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
           root->flags = ctx->flags & ~CGRP_ROOT_FAVOR_DYNMODS;
                                       ^
   1 warning and 8 errors generated.
--
>> kernel/cgroup/cgroup-v1.c:878:20: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
           if (root->flags & CGRP_ROOT_FAVOR_DYNMODS)
                             ^
   kernel/cgroup/cgroup-v1.c:970:17: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   ctx->flags |= CGRP_ROOT_FAVOR_DYNMODS;
                                 ^
   kernel/cgroup/cgroup-v1.c:973:18: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   ctx->flags &= ~CGRP_ROOT_FAVOR_DYNMODS;
                                  ^
>> kernel/cgroup/cgroup-v1.c:1227:3: error: call to undeclared function 'cgroup_favor_dynmods'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   cgroup_favor_dynmods(root, ctx->flags & CGRP_ROOT_FAVOR_DYNMODS);
                   ^
   kernel/cgroup/cgroup-v1.c:1227:43: error: use of undeclared identifier 'CGRP_ROOT_FAVOR_DYNMODS'
                   cgroup_favor_dynmods(root, ctx->flags & CGRP_ROOT_FAVOR_DYNMODS);
                                                           ^
   5 errors generated.


vim +/CGRP_ROOT_FAVOR_DYNMODS +1310 kernel/cgroup/cgroup.c

  1307	
> 1308	void cgroup_favor_dynmods(struct cgroup_root *root, bool favor)
  1309	{
> 1310		bool favoring = root->flags & CGRP_ROOT_FAVOR_DYNMODS;
  1311	
  1312		/* see the comment above CGRP_ROOT_FAVOR_DYNMODS definition */
  1313		if (favor && !favoring) {
  1314			rcu_sync_enter(&cgroup_threadgroup_rwsem.rss);
  1315			root->flags |= CGRP_ROOT_FAVOR_DYNMODS;
  1316		} else if (!favor && favoring) {
  1317			rcu_sync_exit(&cgroup_threadgroup_rwsem.rss);
  1318			root->flags &= ~CGRP_ROOT_FAVOR_DYNMODS;
  1319		}
  1320	}
  1321	

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