nios2/mm: refactor swap PTE layout

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nios2 disables swap for a good reason: it doesn't even provide sufficient
type bits as required by core MM.  However, swap entries are nowadays also
used for other purposes (migration entries, PTE markers, HWPoison, ...),
and accidential use could be problematic.

Let's properly use 5 bits for the swap type and document the layout.  Bits
26--31 should get ignored by hardware completely, so they can be used.

Link: https://lkml.kernel.org/r/20230113171026.582290-14-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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

parent 83d3b2b46e

commit 0a9ad8273f

1 changed files with 10 additions and 8 deletions

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arch/nios2/include/asm/pgtable.h

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