Re: [RFC] prevent "dd if=/dev/mem" crash

[Andrew Morton]

Matt Chapman <matthewc@xxxxxxxxxxxxxxx> wrote:
>
> It *does* signal a fault, in the form of a machine check.  On other
>  architectures I'm familiar with this is usually implemented as an
>  interrupt, but the idea is similar - when the system bus controller
>  detects a bad address on the bus, it returns all 1s (for a read) and
>  signals an interrupt.

I see.  That seems OK.  At least it means that software can implement a
probing function and that the time interval between hot unplug and handling
the unplug interrupt can be managed appropriately.


-
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/