3.19 scheduler might_sleep triggered from module loading during boot.

[Dave Jones]

I don't recall seeing this one until now..

	Dave

[    3.559609] WARNING: CPU: 0 PID: 181 at kernel/sched/core.c:7326 __might_sleep+0xd0/0xf0()
[    3.559701] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff950e1db3>] prepare_to_wait_event+0x93/0x1f0
[    3.559800] CPU: 0 PID: 181 Comm: modprobe Not tainted 3.19.0+ #5
[    3.559932]  ffffffff950b75b0 ffff88020da3fba8 ffffffff9573726a ffffffff95101ec3
[    3.560174]  ffff88020da3fbf8 ffff88020da3fbe8 ffffffff950742f2 ffffffff964c1fa0
[    3.561927]  ffffffff95ad86e8 000000000000026d 0000000000000000 ffff88020da9aac0
[    3.562159] Call Trace:
[    3.562218]  [<ffffffff950b75b0>] ? __might_sleep+0xd0/0xf0
[    3.562288]  [<ffffffff9573726a>] dump_stack+0x84/0xb9
[    3.562359]  [<ffffffff95101ec3>] ? console_unlock+0x373/0x690
[    3.562431]  [<ffffffff950742f2>] warn_slowpath_common+0xd2/0x140
[    3.562495]  [<ffffffff95074457>] warn_slowpath_fmt+0x57/0x70
[    3.562569]  [<ffffffff950e1db3>] ? prepare_to_wait_event+0x93/0x1f0
[    3.562641]  [<ffffffff950e1db3>] ? prepare_to_wait_event+0x93/0x1f0
[    3.562728]  [<ffffffff950b75b0>] __might_sleep+0xd0/0xf0
[    3.562799]  [<ffffffff9573b9c1>] mutex_lock_nested+0x41/0x760
[    3.562870]  [<ffffffff950cb16d>] ? local_clock+0x4d/0x60
[    3.562933]  [<ffffffff957439ef>] ? _raw_spin_unlock_irqrestore+0x5f/0xc0
[    3.563009]  [<ffffffff9514e888>] resolve_symbol.isra.35+0x48/0x150
[    3.563081]  [<ffffffff951521b4>] load_module+0x1134/0x20b0
[    3.563149]  [<ffffffff953ed85e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[    3.563221]  [<ffffffff950e1570>] ? wait_woken+0x110/0x110
[    3.563290]  [<ffffffff95744ba0>] ? retint_restore_args+0xe/0xe
[    3.563359]  [<ffffffff95153262>] SyS_init_module+0x132/0x190
[    3.563433]  [<ffffffff95743f52>] system_call_fastpath+0x12/0x17

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