mtd: kernel BUG at arch/x86/mm/pat.c:279!

[Linus Torvalds]

On Sun, Sep 9, 2012 at 7:56 AM, Suresh Siddha <suresh.b.siddha at intel.com> wrote:
>
> yes but that is not a valid range I think because of the supported
> physical address bit limits of the processor and also the max
> architecture limit of 52 address bits.

But how could the caller possibly know that? None of those internal
PAT limits are exposed anywhere.

So doing the BUG_ON() is wrong. I'd suggest changing it to an EINVAL.

In fact, BUG_ON() is *always* wrong, unless it's a "my internal data
structures are so messed up that I cannot continue".

                Linus