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Date:   Tue, 23 Apr 2019 12:36:11 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Christophe Leroy <christophe.leroy@c-s.fr>
Cc:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        linuxppc-dev@lists.ozlabs.org, Jason Baron <jbaron@akamai.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/10] powerpc: select DYNAMIC_DEBUG_RELATIVE_POINTERS
 for PPC64
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On Tue, 23 Apr 2019 17:37:33 +0200 Christophe Leroy <christophe.leroy@c-s.fr> wrote:

> > --- a/arch/powerpc/Kconfig
> > +++ b/arch/powerpc/Kconfig
> > @@ -155,6 +155,7 @@ config PPC
> >   	select BUILDTIME_EXTABLE_SORT
> >   	select CLONE_BACKWARDS
> >   	select DCACHE_WORD_ACCESS		if PPC64 && CPU_LITTLE_ENDIAN
> > +	select DYNAMIC_DEBUG_RELATIVE_POINTERS	if PPC64
> 
> Why only PPC64 ? Won't it work with PPC32 ? Or would it be 
> counter-performant on 32 bits ?

Ditto arm and i386?