[PATCH] powerpc: Add configurable -Werror for arch/powerpc

[Benjamin Herrenschmidt]

> Currently this appears to break only one of the defconfigs, chrp32.
> 
> http://kisskb.ellerman.id.au/kisskb/head/1907/
> 
> And that's a legitimate error AFAICT:
> 
> arch/powerpc/platforms/chrp/setup.c:378: error: the frame size of 1040 bytes is larger than 1024 bytes
> 
> From:
> 
> 367 void
> 368 chrp_event_scan(unsigned long unused)
> 369 {
> 370         unsigned char log[1024];
> 371         int ret = 0;

I wonder to what extent we could merge that with the pSeries
event-scan...

We can have a closer look tomorrow. In any case, stack alloc for that is
indeed fishy.

Cheers,
Ben.