If the entity isn't a task, return the task struct is meaningless.
Return NULL when entity isn't a task that makes the code more concise.
v1 -> v2:
fix 'struct rt_rq' no member named 'highest_prio'.
Yajun Deng (2):
sched/fair: Return NULL when entity isn't a task in task_of()
sched/rt: Return NULL when rt entity isn't a task in rt_task_of()
kernel/sched/fair.c | 50 ++++++++++++++++++------------------
kernel/sched/rt.c | 60 +++++++++++++-------------------------------
kernel/sched/sched.h | 4 ++-
3 files changed, 44 insertions(+), 70 deletions(-)