CC      kernel/cgroup.o
  CC      kernel/cgroup_freezer.o
kernel/cgroup_freezer.c: In function 'freezer_can_attach':
kernel/cgroup_freezer.c:171:5: warning: 'task' is used uninitialized in this function [-Wuninitialized]
  if ((current != task) && (!capable(CAP_SYS_ADMIN))) {
     ^
  CC      kernel/cpuset.o
kernel/cpuset.c: In function 'cpuset_can_attach':
kernel/cpuset.c:1371:18: error: 'task' undeclared (first use in this function)
  if ((current != task) && (!capable(CAP_SYS_ADMIN))) {
                  ^
kernel/cpuset.c:1371:18: note: each undeclared identifier is reported only once for each function it appears in
kernel/cpuset.c: At top level:
kernel/cpuset.c:1410:12: error: conflicting types for 'cpuset_can_attach'
 static int cpuset_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
            ^
kernel/cpuset.c:1366:12: note: previous definition of 'cpuset_can_attach' was here
 static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
            ^
kernel/cpuset.c:1366:12: warning: 'cpuset_can_attach' defined but not used [-Wunused-function]
kernel/cpuset.c:1395:12: warning: 'cpuset_can_attach_task' defined but not used [-Wunused-function]
 static int cpuset_can_attach_task(struct cgroup *cgrp, struct task_struct *task)
            ^
scripts/Makefile.build:307: recipe for target 'kernel/cpuset.o' failed
make[1]: *** [kernel/cpuset.o] Error 1
Makefile:950: recipe for target 'kernel' failed
make: *** [kernel] Error 2