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    SubjectRe: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24


    On Tue, 28 Jun 2005, Steven Rostedt wrote:

    >
    > [Please CC Ingo Molnar on all RT kernel issues]
    >
    > On Mon, 27 Jun 2005, Daniel Walker wrote:
    >
    > > On Mon, 2005-06-27 at 12:01 -0700, Chuck Harding wrote:
    > > > What can be causing the following message to appear in dmesg and
    > > > how can I fix it?
    > > >
    > > > BUG: scheduling with irqs disabled: kapmd/0x00000000/46
    > > > caller is schedule_timeout+0x51/0x9e
    > > > [<c02b3bc9>] schedule+0x96/0xf6 (8)
    > > > [<c02b43f7>] schedule_timeout+0x51/0x9e (28)
    > > > [<c01222ed>] process_timeout+0x0/0x5 (32)
    > > > [<c0112063>] apm_mainloop+0x7a/0x96 (24)
    > > > [<c0115e45>] default_wake_function+0x0/0x16 (12)
    > > > [<c0115e45>] default_wake_function+0x0/0x16 (32)
    > > > [<c0111485>] apm_driver_version+0x1c/0x38 (16)
    > > > [<c01126f7>] apm+0x0/0x289 (8)
    > > > [<c01127a6>] apm+0xaf/0x289 (8)
    > > > [<c010133c>] kernel_thread_helper+0x0/0xb (20)
    > > > [<c0101341>] kernel_thread_helper+0x5/0xb (4)
    > > >
    > > > This was also present in earlier final-V0.7.50 version I've tried
    > > > (since -00) I don't get hangs but that doesn't look like it should
    > > > be happening. Thanks.
    > >
    > > If you have PREEMPT_RT enabled, it looks like interrupts are hard
    > > disabled then there is a schedule_timeout() requested. You could try
    > > turning off power management and see if you still have problems.
    > >
    >
    > Although turning off apm works, this is a fix to the symptom and not a
    > cure. Has someone already taken a look at this code? Since
    > apm_bios_call_simple calls local_save_flags and afterwards
    > raw_lock_irq_restore is then called. Shouldn't that have been
    > raw_local_save_flags?
    >
    > That apm_bios_call_simple_asm also looks pretty scary! I haven't yet
    > figured out how APM_FUNC_VERSION becomes a normal function.


    I looked at them briefly.. It looks like there is some raw and non-raw
    mixed usage .

    Daniel

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