• K
    xen/smp: Fix bringup bug in AP code. · 106b4438
    Konrad Rzeszutek Wilk 提交于
    The CPU hotplug code has now a callback to help bring up the CPU.
    Without the call we end up getting:
    
     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-ged378a52 #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
    
    Thix fixes it.
    Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
    Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    106b4438
smp.c 13.0 KB