m68k/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

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Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the
type.  Generic MM currently only uses 5 bits for the type
(MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused.

While at it, make sure for sun3 that the valid bit never gets set by
properly masking it off and mask the type in __swp_entry().

Link: https://lkml.kernel.org/r/20230113171026.582290-11-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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David Hildenbrand 2023-01-13 18:10:10 +01:00 • committed by Andrew Morton

parent ad464ff2c0

commit ed4154067a

3 changed files with 104 additions and 9 deletions

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36

arch/m68k/include/asm/mcf_pgtable.h

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38

arch/m68k/include/asm/motorola_pgtable.h

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39

arch/m68k/include/asm/sun3_pgtable.h

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