linux-kernel - Re: [PATCH 11/13] m68k/mm: make node data and node setup depend on CONFIG

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Message-ID: <20201028111631.GF1428094@kernel.org>
Date:   Wed, 28 Oct 2020 13:16:31 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>, Meelis Roos <mroos@...ux.ee>,
        Michael Schmitz <schmitzmic@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux MM <linux-mm@...ck.org>,
        arcml <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH 11/13] m68k/mm: make node data and node setup depend on
 CONFIG_DISCONTIGMEM

Hi Geert,

On Wed, Oct 28, 2020 at 10:25:49AM +0100, Geert Uytterhoeven wrote:
> Hi Mike,
> 
> On Tue, Oct 27, 2020 at 12:31 PM Mike Rapoport <rppt@...nel.org> wrote:
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> >
> > The pg_data_t node structures and their initialization currently depends on
> > !CONFIG_SINGLE_MEMORY_CHUNK. Since they are required only for DISCONTIGMEM
> > make this dependency explicit and replace usage of
> > CONFIG_SINGLE_MEMORY_CHUNK with CONFIG_DISCONTIGMEM where appropriate.
> >
> > The CONFIG_SINGLE_MEMORY_CHUNK was implicitly disabled on the ColdFire MMU
> > variant, although it always presumed a single memory bank. As there is no
> > actual need for DISCONTIGMEM in this case, make sure that ColdFire MMU
> > systems set CONFIG_SINGLE_MEMORY_CHUNK to 'y'.
> >
> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> 
> Thanks for your patch!
> 
> > ---
> >  arch/m68k/Kconfig.cpu           | 6 +++---
> >  arch/m68k/include/asm/page_mm.h | 2 +-
> >  arch/m68k/mm/init.c             | 4 ++--
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> Is there any specific reason you didn't convert the checks for
> CONFIG_SINGLE_MEMORY_CHUNK in arch/m68k/kernel/setup_mm.c

In arch/m68k/kernel/setup_mm.c the CONFIG_SINGLE_MEMORY_CHUNK is needed
for the case when a system has two banks, the kernel is loaded into the
second bank and so the first bank cannot be used as normal memory. It
does not matter what memory model will be used in this case. 

> and arch/m68k/include/asm/virtconvert.h?
 
I remember I had build errors and troubles with include file
dependencies if I changed it there, but I might be mistaken. I'll
recheck again.

> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

-- 
Sincerely yours,
Mike.