> My first trial used ARCH=ppc and caused this infinity of "SPE used in kernel"
> messages, but I then recompiled linux with ARCH=powerpc.  With the message
> not ifdef'ed out, this second kernel does not emit "SPE used in kernel"
> messages,

If I were to venture a guess I'd point to the fact that the arch/powerpc
Makefile contains

# No SPE instruction when building kernel
KBUILD_CFLAGS += $(call cc-option,-mno-spe)  

while the arch/ppc one doesn't.

johannes

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