From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Date: Sat, 18 Oct 2003 01:41:11 +0000 Subject: Re: [RFC] prevent "dd if=/dev/mem" crash Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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.