systemd, fpdt and /dev/mem

I just noticed systemd has started doing this:

[ 3228.978745] Program systemd tried to access /dev/mem between 30a48000->30a48008.

After some investigation, it seems that it's reading /sys/firmware/acpi/tables/FPDT to get a pointer, and then trying to read that address using /dev/mem. Asides from the grossness of grovelling around in memory, given it's too late to stop exporting pointers in sysfs objects, should there perhaps be a better way to export the data the FPDT is pointing at ?

Or should some part of acpi be reserving the memory range it points to, so that the /dev/mem driver doesn't freak out ?

Curiously, the address it points to is in this range..
302b5000-3129dfff : Kernel bss

Which makes me wonder what exactly it's reading.

Dave