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SubjectRe: Calling current() from interrupt context
On Sun, Oct 08, 2000 at 03:58:55PM -0700, Mitchell Blank Jr wrote:
> wrote:
> > Looking at the code, I don't see any places where "current" is not valid.
> > Got some examples?
> It's not that its invalid, it just doesn't make much sense. It points to
> whatever task happened to be running when the interrupt happened. So
> any attempt to access it is 99% likely to be a bug.


> > BTW: there is an implicit reference to "current" in smp_processor_id.
> Yes, on architectures that use current->processor that is an exception
> to the rule. After all, you know for sure that you're still on the
> same CPU as the task currently running.

This makes sense. And I wish cpu architects would put a cpu-id
register somewhere
so that we could have fast computation of cpu-id on smp machines.

> -Mitch

Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.

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