Re: VM86 interrupt emulation breakage and FIXes for 2.6.x kernelseries

[Linus Torvalds]

On Fri, 10 Dec 2004, Alan Cox wrote:
>
> On Gwe, 2004-12-10 at 22:55, Linus Torvalds wrote:
> > On Fri, 10 Dec 2004, Alan Cox wrote:
> > The vm86 interrupt does not allow sharing. And it really _has_ to be 
> > disabled until user mode has cleared the irq source, or you'll have a very 
> > dead machine.
> 
> Until the 10,000th event it actually seems to work rather happily
> without that change.

I suspect you never tried the level-triggered case.

In the level-triggered case, the 10,000 interrupts happen faster than 
user-mode can even say "Whaaa?".

		Linus
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