Re: 2.6.8-rc3-mm2

[Russell King]

On Tue, Aug 10, 2004 at 03:16:28PM +0200, Ingo Molnar wrote:
> 
> * Russell King <rmk+lkml@xxxxxxxxxxxxxxxx> wrote:
> 
> > Except serial console IO does not generate _any_ IRQ traffic - it
> > purposely disables IRQs on the device before starting any IO to
> > prevent any user-level IO interfering with the console output.
> 
> indeed - but it does generate _some_ IRQ traffic still:
> 
>   3:        251    IO-APIC-edge  serial
> 
> this is from a box that uses the serial line only for the kernel
> console.

If the IRQ is claimed, userspace has opened the port.  Is a getty
running on the port?  If so, it would've written some messages to
the port, which would have caused these interrupts.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/