On Sun, 8 Oct 2000, Kenn Humborg wrote:
>
> I'd just like to confirm that it's illegal to call current()
> from interrupt-handling code.
>
> I'm working on the VAX port and the reason I ask is that the
> VAX has separate stack pointers for user, kernel and interrupt
> contexts. Therefore, the current = (SP & ~8192) hack will give
> completely bogus results when handling an interrupt.
>
> My feeling is that interrupt code has no business calling current(),
> but I don't know the kernel well enough to be sure. Is there any
> interrupt-level code that calls current() or is it a design
> principle that it cannot be called?
>
Normally no, you can't - IRQ handlers are called from system context, not user
context, and are in no way associated to any process.
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This archive was generated by hypermail 2b29 : Sun Oct 15 2000 - 21:00:12 EST