smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()

The following race exists in the smpboot percpu threads management:

CPU0	      	   	     CPU1
cpu_up(2)
  get_online_cpus();
  smpboot_create_threads(2);
			     smpboot_register_percpu_thread();
			     for_each_online_cpu();
			       __smpboot_create_thread();
  __cpu_up(2);

This results in a missing per cpu thread for the newly onlined cpu2 and
in a NULL pointer dereference on a consecutive offline of that cpu.

Proctect smpboot_register_percpu_thread() with get_online_cpus() to
prevent that.

[ tglx: Massaged changelog and removed the change in
        smpboot_unregister_percpu_thread() because that's an
        optimization and therefor not stable material. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1406777421-12830-1-git-send-email-laijs@cn.fujitsu.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

path: root/.zsh/zshenv/80_python

# zshenv/80_python
#
# Set variables related to Python
#
# Copyright © 2014-2016 Tobias Klauser <tklauser@distanz.ch>
# Released under the terms of the Artistic Licence 2.0
#
# Source repository: git://git.distanz.ch/dotfiles/zsh.git

_PYTHON_USER=$HOME/.local/lib/python2.7/site-packages
_ZIPYTHON_LATEST=$HOME/tmp/ziPythonLatest/

[ -d $_PYTHON_USER ] && export PYTHONPATH=$_PYTHON_USER:$PYTHONPATH
[ -d $_ZIPYTHON_LATEST ] && export PYTHONPATH=$PYTHONPATH:$_ZIPYTHON_LATEST

# vim:ft=zsh