Re: Reading /dev/mem by dd

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

> Well, if debugging is the primary use, maybe the best long term plan
> would be to get rid of the need for /dev/mem for anything other than
> debugging, and after that is accomplished, move it to debugfs or make
> it optional?

/dev/mem is ABI and API. It's also part of Unix tradition and all sorts
of other stuff. It's just fine where it is.

> > The X case also involves X and the kernel both working with the same
> > resource and in many cases that resource having registers that can
> > crash a system if mis-accessed.
> 
> I see.  That also tells me that whatever dark sides KMS has, it is much
> better than the alternative :-)

Modern video doesn't really fit the simple kernel frame buffer model
anyway but it is important that the kernel now manages the resources for
all sorts of reasons including hotplug.