From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 17 Oct 2007 06:30:56 +0000 (-0700)
Subject: do CPU_DEAD migrating under read_lock(tasklist) instead of write_lock_irq(tasklist)
X-Git-Tag: v2.6.24-rc1~555
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7b4cddcc5aca03e80e357360c9424dfba5056c2;p=pandora-kernel.git

do CPU_DEAD migrating under read_lock(tasklist) instead of write_lock_irq(tasklist)

Currently move_task_off_dead_cpu() is called under
write_lock_irq(tasklist).  This means it can't use task_lock() which is
needed to improve migrating to take task's ->cpuset into account.

Change the code to call move_task_off_dead_cpu() with irqs enabled, and
change migrate_live_tasks() to use read_lock(tasklist).

This all is a preparation for the futher changes proposed by Cliff Wickman, see
	http://marc.info/?t=117327786100003

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Cliff Wickman <cpw@sgi.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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