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

From: Andrew Morton <>
Date: 2003-10-18 11:41:11
Matt Chapman <> 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.

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Received on Fri Oct 17 21:41:39 2003

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