Peter Zijlstra a09adfeb9e sched: Fix balance vs hotplug race ... commit 6ad4c18884 upstream. Since (e761b77: cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment) we have cpu_active_mask which is suppose to rule scheduler migration and load-balancing, except it never (fully) did. The particular problem being solved here is a crash in try_to_wake_up() where select_task_rq() ends up selecting an offline cpu because select_task_rq_fair() trusts the sched_domain tree to reflect the current state of affairs, similarly select_task_rq_rt() trusts the root_domain. However, the sched_domains are updated from CPU_DEAD, which is after the cpu is taken offline and after stop_machine is done. Therefore it can race perfectly well with code assuming the domains are right. Cure this by building the domains from cpu_active_mask on CPU_DOWN_PREPARE. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Holger Hoffstätte <holger.hoffstaette@googlemail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-01-06 15:04:49 -08:00
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acpi	ACPI: remove acpi_device_uid() and related stuff	2009-09-25 15:09:49 -04:00
asm-generic	fcntl: rename F_OWNER_GID to F_OWNER_PGRP	2009-11-17 17:40:33 -08:00
crypto
drm	drm/i915: Fix sync to vblank when VGA output is turned off	2009-12-18 14:05:26 -08:00
keys
linux	sched: Fix balance vs hotplug race	2010-01-06 15:04:49 -08:00
math-emu
media	V4L/DVB (13019): video: initial support for ADV7180	2009-09-19 00:53:39 -03:00
mtd
net	netfilter: fix crashes in bridge netfilter caused by fragment jumps	2010-01-06 15:04:40 -08:00
pcmcia	PM / yenta: Split resume into early and late parts (rev. 4)	2009-11-03 10:54:58 +01:00
rdma	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
rxrpc
scsi	SCSI: osd_protocol.h: Add missing #include	2009-12-14 09:44:45 -08:00
sound
trace	tracing: Fix event format export	2009-12-18 14:05:16 -08:00
video	davinci-fb-frame-buffer-driver-for-ti-da8xx-omap-l1xx-v4	2009-09-23 07:39:51 -07:00
xen
Kbuild