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    SubjectRe: [PATCH] xen/smp: Fix bringup bug in AP code.
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    On Wed, 2012-03-21 at 23:04 -0400, Konrad Rzeszutek Wilk wrote:
    > The CPU hotplug code has now a callback to help bring up the CPU.
    > Without the call we end up getting:

    Its had this for a while now (since 2008, see e545a614). Its just that
    generic infrastructure started using it only now.

    > BUG: soft lockup - CPU#0 stuck for 29s! [migration/0:6]
    > Modules linked in:
    > CPU ] Pid: 6, comm: migration/0 Not tainted 3.3.0upstream-01180-ged378a5 #1 Dell Inc. PowerEdge T105 /0RR825
    > RIP: e030:[<ffffffff810d3b8b>] [<ffffffff810d3b8b>] stop_machine_cpu_stop+0x7b/0xf0
    > RSP: e02b:ffff8800ceaabdb0 EFLAGS: 00000293
    > .. snip..
    > Call Trace:
    > [<ffffffff810d3b10>] ? stop_one_cpu_nowait+0x50/0x50
    > [<ffffffff810d3841>] cpu_stopper_thread+0xf1/0x1c0
    > [<ffffffff815a9776>] ? __schedule+0x3c6/0x760
    > [<ffffffff815aa749>] ? _raw_spin_unlock_irqrestore+0x19/0x30
    > [<ffffffff810d3750>] ? res_counter_charge+0x150/0x150
    > [<ffffffff8108dc76>] kthread+0x96/0xa0
    > [<ffffffff815b27e4>] kernel_thread_helper+0x4/0x10
    > [<ffffffff815aacbc>] ? retint_restore_ar
    >
    > This fixes it.
    >
    > Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

    Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>


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