s390/mm: better annotate 2KB pagetable fragments handling

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Explicitly encode immediate value of pending remove nibble
(bits 31-28) and tracking nibble (bits 27-24) of the page
refcount whenever these nibbles are tested or changed, for
better readability. Also, add some comments describing how
the fragments are handled.

Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Alexander Gordeev 2021-11-04 07:14:45 +01:00 • committed by Heiko Carstens

parent c2c224932f

commit 1194372db6

1 changed files with 107 additions and 20 deletions

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arch/s390/mm/pgalloc.c

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