linux-kernel - Re: [PATCH v2 1/2] powerpc: permanently include 8xx registers in reg.h

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Date:   Thu, 29 Aug 2019 16:30:16 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, segher@...nel.crashing.org,
        npiggin@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/2] powerpc: permanently include 8xx registers in reg.h

Christophe Leroy <christophe.leroy@....fr> writes:

> Most 8xx registers have specific names, so just include
> reg_8xx.h all the time in reg.h in order to have them defined
> even when CONFIG_PPC_8xx is not selected. This will avoid
> the need for #ifdefs in C code.
>
> Guard SPRN_ICTRL in an #ifdef CONFIG_PPC_8xx as this register
> has same name but different meaning and different spr number as
> another register in the mpc7450.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>
> ---
> v2: no change
> ---
>  arch/powerpc/include/asm/reg.h     | 2 --
>  arch/powerpc/include/asm/reg_8xx.h | 2 ++
>  2 files changed, 2 insertions(+), 2 deletions(-)

This breaks the ppc64e build unfortunately, presumably due to it
changing the ordering of header inclusion.

In file included from ../arch/powerpc/include/asm/percpu.h:13,
                 from ../arch/powerpc/include/asm/mmu.h:137,
                 from ../arch/powerpc/include/asm/reg_8xx.h:8,
                 from ../arch/powerpc/include/asm/reg.h:28,
                 from ../arch/powerpc/include/asm/processor.h:9,
                 from ../include/linux/processor.h:6,
                 from ../arch/powerpc/include/asm/delay.h:6,
                 from ../include/linux/delay.h:26,
                 from ../lib/nmi_backtrace.c:17:
../arch/powerpc/include/asm/paca.h:147:23: error: field 'tcd' has incomplete type
  struct tlb_core_data tcd;
                       ^~~

cheers