cpu_hotplug_latency test hang on linux-linaro

[Naresh Kamboju]

while running cpu_hotplug_latency test on linux-linaro, system hang and LAVA job is incomplete

Test execution log:
Running test suite cpuhotplugsuite
[ 294.941671] ------------[ cut here ]------------
[ 294.955317] WARNING: at /mnt/jenkins/workspace/linaro-android_vexpress-linaro-13.06-release/build/kernel/linaro/vexpress/kernel/workqueue.c:4601 workqueue_cpu_up_callback+0x171/0x268()
[ 295.003776] Modules linked in: gator
[ 295.014347] CPU: 1 PID: 4287 Comm: run.sh Not tainted 3.10.0-rc6-00192-gb660da8 #1
[ 295.036704] [<c0011c39>] (unwind_backtrace+0x1/0x9c) from [<c000fc0d>] (show_stack+0x11/0x14)
[ 295.061876] [<c000fc0d>] (show_stack+0x11/0x14) from [<c001cc25>] (warn_slowpath_common+0x45/0x5c)
[ 295.088331] [<c001cc25>] (warn_slowpath_common+0x45/0x5c) from [<c001ccab>] (warn_slowpath_null+0x17/0x1c)
[ 295.116833] [<c001ccab>] (warn_slowpath_null+0x17/0x1c) from [<c03e561d>] (workqueue_cpu_up_callback+0x171/0x268)
[ 295.147133] [<c03e561d>] (workqueue_cpu_up_callback+0x171/0x268) from [<c00388e5>] (notifier_call_chain+0x45/0x58)
[ 295.177688] [<c00388e5>] (notifier_call_chain+0x45/0x58) from [<c03e2d05>] (_cpu_down+0xa1/0x1fc)
[ 295.203883] [<c03e2d05>] (_cpu_down+0xa1/0x1fc) from [<c03e2e83>] (cpu_down+0x23/0x38)
[ 295.227258] [<c03e2e83>] (cpu_down+0x23/0x38) from [<c03e364f>] (store_online+0x33/0x50)
[ 295.251151] [<c03e364f>] (store_online+0x33/0x50) from [<c00f699f>] (sysfs_write_file+0xfb/0x130)
[ 295.277349] [<c00f699f>] (sysfs_write_file+0xfb/0x130) from [<c00b1995>] (vfs_write+0x75/0x114)
[ 295.303030] [<c00b1995>] (vfs_write+0x75/0x114) from [<c00b1d5b>] (SyS_write+0x2f/0x58)
[ 295.326664] [<c00b1d5b>] (SyS_write+0x2f/0x58) from [<c000cc81>] (ret_fast_syscall+0x1/0x46)
[ 295.351578] ---[ end trace 38270ba058b50ff1 ]---
[ 295.365513] _cpu_down: attempt to take down CPU 1 failed

This testing on lava is incomplete.
LAVA complete log:
http://validation.linaro.org/lava-server/scheduler/job/60018/log_file#entry86