kilauea compilation breaks with v3.3 kernel and ELDK 4.2

[Josh Boyer]

On Mon, Apr 2, 2012 at 5:08 PM, Benjamin Herrenschmidt
<benh at kernel.crashing.org> wrote:
> On Mon, 2012-04-02 at 08:10 -0400, Josh Boyer wrote:
>> On Fri, Mar 30, 2012 at 8:03 PM, Benjamin Herrenschmidt
>> <benh at kernel.crashing.org> wrote:
>> > On Sat, 2012-03-31 at 00:53 +0200, Frank Svendsbøe wrote:
>> >
>> >> Hi Josh Boyer,
>> >>
>> >> just wanted to add that I'm experiencing the same problem that Robert
>> >> reported, but on 8xx instead of 4xx. The mpc8xx does not support the
>> >> mfdcrx instruction, so maybe it's more to it than just a binutils bug?
>> >
>> > The kernel shouldn't have tried to build that instruction on 8xx, though
>> > I suppose if it's in arch/powerpc/boot, we are a bit too eager at
>> > building everything including what's not relevant, we might to be a bit
>> > more careful at excluding 4xx stuff on a 8xx kernel.
>>
>> It's still a binutils issue.  Sounds like the toolchain being used to
>> build the 8xx kernel is specifically built for 8xx.  A generally built
>> binutils should have worked fine (assuming it was new enough), since
>> we pass -mcpu=405.
>
> Still, it makes sense to limit the building of the wrappers to the CPU
> family of the kernel...

Oh, I'm not really disagreeing with that.  I think I said as much about
4 years ago, but at the time the prevailing opinion was what we
currently have.  I never really understood why.

Out with the old, in with the sane.

josh