linux-kernel - Re: [PATCH v2 15/25] powerpc/8xx: move 8xx SPRN defines into reg

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Date:	Tue, 6 Oct 2015 11:56:39 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Christophe Leroy <christophe.leroy@....fr>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 15/25] powerpc/8xx: move 8xx SPRN defines into
 reg_8xx.h and add some missing ones

On Tue, 2015-10-06 at 16:35 +0200, Christophe Leroy wrote:
> Le 29/09/2015 02:03, Scott Wood a écrit :
> > On Tue, Sep 22, 2015 at 06:50:58PM +0200, Christophe Leroy wrote:
> > > Move 8xx SPRN defines into reg_8xx.h and add some missing ones
> > > 
> > > Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> > > ---
> > > No change in v2
> > Why are they being moved?  Why are they being separated from the bit
> > definitions?
> > 
> > 
> It was to keep asm/reg_8xx.h self sufficient for the following patch.

Again, it would have been nice if this were in the commit message.

> Also because including asm/mmu-8xx.h creates circular inclusion issue 
> (mmu-8xx.h needs page.h which includes page-32.h, page-32.h includes 
> cache.h, cache.h include reg.h which includes reg_8xx). The circle 
> starts with an inclusion of asm/cache.h by linux/cache.h, himself 
> included by linux/printk.h, and I end up with 'implicit declaration' issues.
> 
> How can I fix that ?

mmu-8xx.h should have been including page.h instead of assuming the caller h 
as done so...  but another option is to do what mmu-book3e.h does, and use 
the kconfig symbols instead of PAGE_SHIFT.

-Scott

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