Hi Mike,

On Mon, Nov 4, 2019 at 10:48 AM Mike Rapoport [off-list ref] wrote:

On Mon, Nov 04, 2019 at 09:53:34AM +0100, Geert Uytterhoeven wrote:

quoted

On Mon, Nov 4, 2019 at 7:57 AM Mike Rapoport [off-list ref] wrote:

quoted

From: Mike Rapoport <redacted>
m68k has two or three levels of page tables and can use appropriate
pgtable-nopXd and folding of the upper layers.

Replace usage of include/asm-generic/4level-fixup.h and explicit
definitions of __PAGETABLE_PxD_FOLDED in m68k with
include/asm-generic/pgtable-nopmd.h for two-level configurations and with
include/asm-generic/pgtable-nopud.h for three-lelve configurations and
adjust page table manipulation macros and functions accordingly.

Signed-off-by: Mike Rapoport <redacted>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>

Thanks for your patch!

The build error reported for v1 by kbuild test robot when building for
sun3x is still there (m68k defconfig or sun3x_defconfig):

    arch/m68k/sun3x/dvma.c: In function ‘dvma_map_cpu’:
    arch/m68k/sun3x/dvma.c:98:33: error: passing argument 2 of
‘pmd_alloc’ from incompatible pointer type
[-Werror=incompatible-pointer-types]
       if((pmd = pmd_alloc(&init_mm, pgd, vaddr)) == NULL) {
                                     ^~~
    In file included from arch/m68k/sun3x/dvma.c:17:
    include/linux/mm.h:1875:61: note: expected ‘pud_t *’ {aka ‘struct
<anonymous> *’} but argument is of type ‘pgd_t *’ {aka ‘struct
<anonymous> *’}
     static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud,
unsigned long address)
                                                          ~~~~~~~^~~

The initial report was against older mmotm (base:
git://git.cmpxchg.org/linux-mmotm.git master) and I presumed this was the
cause of the error. Will fix in v4.

OK, thanks!

My tree is based on m68k/master, which does not include the mmotm tree,
and should be fairly similar to plain v5.4-rc6.

quoted

This indeed boots fine on ARAnyM, which emulates on 68040.
It would be good to have some boot testing on '020/030, too.

To be honest, I have no idea how to to that :)

Sure. This was more a request for the fellow m68k users.
But don't worry too much about it.  If it breaks '020/'030, we can fix
that later.

Thanks!

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

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