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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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1
include/linux/kernel-page-flags.h
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@ -17,5 +17,6 @@
#define KPF_ARCH 38
#define KPF_UNCACHED 39
#define KPF_SOFTDIRTY 40
#define KPF_ARCH_2 41
#endif /* LINUX_KERNEL_PAGE_FLAGS_H */