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The core freezer logic has been modified by commit f5d39b020809 ("freezer,sched: Rewrite core freezer logic"), so adjust the documentation to reflect the new code. The main changes include: - Drop references to PF_FROZEN and PF_FREEZER_SKIP - Describe TASK_FROZEN, TASK_FREEZABLE and __TASK_FREEZABLE_UNSAFE - Replace system_freezing_cnt with freezer_active - Use a different example for the loop of a freezable kernel thread, since the old code is gone gone Signed-off-by: Kevin Hao <haokexin@gmail.com> [ rjw: Subject and changelog edits, doc text adjustments ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>