On Wed, Oct 28, 2020 at 01:16:41PM +0200, Mike Rapoport wrote:

Hi Geert,

On Wed, Oct 28, 2020 at 10:25:49AM +0100, Geert Uytterhoeven wrote:

quoted

Hi Mike,

On Tue, Oct 27, 2020 at 12:31 PM Mike Rapoport [off-list ref] wrote:

quoted

From: Mike Rapoport <redacted>

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 <redacted>

Thanks for your patch!

quoted

---
 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. 

quoted

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.

There indeed was an issue with SINGLE_MEMORY_CHUNK that selected
NEED_MULTIPLE_NODES for some reason.
With that fixed and removed CONFIG_SINGLE_MEMORY_CHUNK in
arch/m68k/include/asm/virtconvert.h I'm going to send v2 soon.

I've kept CONFIG_SINGLE_MEMORY_CHUNK for now for backwards compatibility
with the plan to remove it along with DISCONTIGMEM.

quoted

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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.

-- 
Sincerely yours,
Mike.

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