From de212f18e92c952533d57c5510d2790199c75734 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 19 Dec 2013 11:54:45 +0100 Subject: [PATCH] sched/deadline: Fix hotplug admission control The current hotplug admission control is broken because: CPU_DYING -> migration_call() -> migrate_tasks() -> __migrate_task() cannot fail and hard assumes it _will_ move all tasks off of the dying cpu, failing this will break hotplug. The much simpler solution is a DOWN_PREPARE handler that fails when removing one CPU gets us below the total allocated bandwidth. Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20131220171343.GL2480@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar --- Reading git-format-patch failed