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mm: Add PG_arch_3 page flag

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As with PG_arch_2, this flag is only allowed on 64-bit architectures due
to the shortage of bits available. It will be used by the arm64 MTE code
in subsequent patches.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Steven Price <steven.price@arm.com>
[catalin.marinas@arm.com: added flag preserving in __split_huge_page_tail()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221104011041.290951-5-pcc@google.com
This commit is contained in:
Peter Collingbourne 2022-11-03 18:10:37 -07:00 • committed by Marc Zyngier
parent 2dbf12ae13
commit ef6458b1b6
5 changed files with 5 additions and 0 deletions
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1
include/linux/kernel-page-flags.h
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@ -18,5 +18,6 @@
#define KPF_UNCACHED 39
#define KPF_SOFTDIRTY 40
#define KPF_ARCH_2 41
#define KPF_ARCH_3 42
#endif /* LINUX_KERNEL_PAGE_FLAGS_H */