mm: free up a word in the first tail page

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Store the folio order in the low byte of the flags word in the first tail
page.  This frees up the word that was being used to store the order and
dtor bytes previously.

Link: https://lkml.kernel.org/r/20230816151201.3655946-11-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Matthew Wilcox (Oracle) 2023-08-16 16:11:58 +01:00 • committed by Andrew Morton

parent c704ae9797

commit ebc1baf5c9

5 changed files with 11 additions and 12 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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10

include/linux/mm.h

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3

include/linux/mm_types.h

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7

include/linux/page-flags.h

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1

kernel/crash_core.c

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2

mm/internal.h

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