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SubjectRe: keyboard problem with 2.6.6
Date
Am Sonntag, 30. Mai 2004 14:22 schrieb Sau Dan Lee:
> >>>>> "Oliver" == Oliver Neukum <oliver@neukum.org> writes:
>
> >> Where it is now possible to move it out of kernel space WITHOUT
> >> performance problems, why not move it out?
>
> Oliver> Two reasons: security and robustness.
>
> Oliver> 1. sysreq must work, always work. Ideally you even do the
> Oliver> dump in hard irq. USB has been modified to support this.
>
> It doesn't always work. Try to compile 'i8042' and 'atkbd' as
> modules. rmmod one of them, and voila: SysRq doesn't work anymore.

Yes. Remove the driver for your root fs and, lo, the kernel will panic.
You must not confuse kernel and user space. The notion that drivers
can be compiled into modules is not exactly new. In which context they
run is the all important question.

Oliver
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