[PATCH] allow kernel compile with native ppc64 compiler

[Olaf Hering]

 On Mon, Oct 18, Paul Mackerras wrote:

> Olaf Hering writes:
> 
> > The zImage is a 32bit binary, but a native powerpc64-linux gcc will
> > produce 64bit objects in arch/ppc64/boot.
> > This patch fixes it.
> 
> ... and breaks the compile on older toolchains that don't understand
> -m32.  We need to make the -m32 conditional on HAS_BIARCH as defined
> in arch/ppc64/Makefile.

how old?

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