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    SubjectRe: BUG: scheduling while atomic, under native_smp_prepare_cpus()
    On Mon, Aug 20, 2012 at 05:42:22PM +0800, Michael Wang wrote:
    > On 08/20/2012 05:27 PM, Fengguang Wu wrote:
    > > Hi Michael,
    > >
    > > On Mon, Aug 20, 2012 at 05:20:35PM +0800, Michael Wang wrote:
    > >> On 08/17/2012 09:49 PM, Fengguang Wu wrote:
    > >>
    > >> Hi, FengGuang
    > >>
    > >> native_smp_prepare_cpus has already disabled the preempt before
    > >> reach __irq_alloc_descs(), and sleep in mutex_lock() cause the bug.
    > >>
    > >> May be the follow patch could help to solve the issue(actually I
    > >> think the true problem should be in _cond_resched...).
    > >
    > > Is this a debug patch? Since what it does is to conditionally disable
    > > the warning.
    >
    > No, I use this as a solution, it should work as the bug reported in boot
    > process before init_post called.
    >
    > We have some reference from __might_sleep which also avoid the check if
    > system has not fully booted, so I think this way is acceptable, but I'm
    > not the one to make decision...

    Fair enough.

    > >
    > >> I can't do test by my self since I can't reproduce the issue on my
    > >> machine, the kernel_init thread never got a need sched flag set at
    > >> that moment in my case...
    > >
    > > I'll try it and report back :)
    >
    > Appreciate :)

    It works! :)

    Tested-by: Fengguang Wu <wfg@linux.intel.com>

    Thanks,
    Fengguang


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