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SubjectRe: 2.4.19-pre3 s390 ret_from_fork patch

>The 2.4.19-pre3 works just dandy as it is without this patch,
>but it is needed for O(1) scheduler. I think Martin was going
>to forward this into 2.5.x tree, where O(1) is standard.
>The problem is that schedule_tail() is supposed to unlock
>runqueue, but if interrupts are enabled before that happens,
>a timer tick may squeeze in and deadlock. I observed such
>situation myself.
>So, I would like this to be in 2.4.19 for the sake of O(1) users.
>Any objections?

No, not really. My fix for 2.5.6 simply removes the stosm because
the sysc_return will disable the interrupts soon after anyway.

blue skies,

Linux/390 Design & Development, IBM Deutschland Entwicklung GmbH
Schönaicherstr. 220, D-71032 Böblingen, Telefon: 49 - (0)7031 - 16-2247

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