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mm: Add PG_arch_2 page flag

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For arm64 MTE support it is necessary to be able to mark pages that
contain user space visible tags that will need to be saved/restored e.g.
when swapped out.

To support this add a new arch specific flag (PG_arch_2). This flag is
only available on 64-bit architectures due to the limited number of
spare page flags on the 32-bit ones.

Signed-off-by: Steven Price <steven.price@arm.com>
[catalin.marinas@arm.com: use CONFIG_64BIT for guarding this new flag]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Steven Price
2020-04-22 15:25:27 +01:00
committed by Catalin Marinas
parent 637ec831ea
commit 4beba9486a
5 changed files with 17 additions and 1 deletions
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3
include/linux/page-flags.h
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@@ -135,6 +135,9 @@ enum pageflags {
#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
PG_young,
PG_idle,
#endif
#ifdef CONFIG_64BIT
PG_arch_2,
#endif
__NR_PAGEFLAGS,