Re: kernel BUG at arch/i386/kernel/apm.c:1699!

["J.A. Magallon" <jamagallon@able.es>]

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On 2002.10.14 Paul P Komkoff Jr wrote:
>------------[ cut here ]------------
>kernel BUG at arch/i386/kernel/apm.c:1699!
>
>#ifdef CONFIG_SMP
>        /* 2002/08/01 - WT
>         * This is to avoid random crashes at boot time during initialization
>         * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
>         * Some bioses don't like being called from CPU != 0.
>         * Method suggested by Ingo Molnar.
>         */
>        if (smp_processor_id() != 0) {
>                current->cpus_allowed = 1;
>                schedule();
>                if (unlikely(smp_processor_id() != 0))
>                        BUG();
>        }
>#endif
>
>Why ? :()
>
>2.5.42-mm2, 2xPPro-233, etc ...
>

Bug in apm vs O1-scheduler. The apm task is moved from processor 0.
I took the fix from -ac tree. Just diff kernel/apm.c from -mm and from
-ac. That worked for me for 2.4 kernels. Perhaps 2.5 needs some additional
fix in other files. (err, I suppose that fix is in Alan's 2.5 tee also...)

Hope this helps.

Anyways, patch for 2.4 attached. I suppose it won't apply on 2.5, but you
can try...

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.20-pre10-jam1 (gcc 3.2 (Mandrake Linux 9.0 3.2-2mdk))

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