Re: [PATCH] Use a sensible tlbex default for unknown CPUs

["Maciej W. Rozycki" <macro@linux-mips.org>]

On Thu, 25 Oct 2007, Thiemo Seufer wrote:

> currently the kernel panics when it boots on an unknown CPU model
> (with an unknown PRID). Based on the assumption that the majority
> of newly supported CPU will conform to Release 2 standard, I wrote
> the appended patch which handles unknown CPUs as R2. It isn't
> completely bulletproof, as (yet unsupported) non-R1/R2 CPUs may
> use the AT config bits for different purposes. I still think this
> is good enough a test.

 Good idea in general, but do we have to rely on the undefined?  How 
about this:

> +             /* Panic if this isn't a Release 2 CPU. */
> +             if (!((read_c0_config() & MIPS_CONF_AT) >> 13)) {

        if (!(current_cpu_data.isa_level &
              (MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M32R2))) {

instead for example?

  Maciej