scx_set_enable_state
switch (scx_set_enable_state(SCX_DISABLING)) {
WARN_ON_ONCE(scx_set_enable_state(SCX_DISABLED) != SCX_DISABLING);
WARN_ON_ONCE(scx_set_enable_state(SCX_DISABLED) != SCX_DISABLING);
WARN_ON_ONCE(scx_set_enable_state(SCX_ENABLING) != SCX_DISABLED);