Merge branch 'for-7.0-fixes' into for-7.1

To prepare for hierarchical scheduling patchset which will cause multiple
conflicts otherwise.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --cc Documentation/scheduler/sched-ext.rst
Simple merge

diff --cc kernel/sched/ext.c
Simple merge

diff --cc kernel/sched/ext_internal.h
Simple merge

diff --cc tools/testing/selftests/sched_ext/Makefile
Simple merge