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| author | Steven Price <steven.price@arm.com> | 2020-04-22 17:25:27 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-09-04 14:46:06 +0300 |
| commit | 4beba9486abd2f86d125271d6946f7c38ed0fe77 (patch) | |
| tree | b6077490a328fe217ca4f359ceea847872f3f4cd /include/linux/kernel-page-flags.h | |
| parent | 637ec831ea4f09c7529ac4078399ce4e25b46341 (diff) | |
| download | linux-4beba9486abd2f86d125271d6946f7c38ed0fe77.tar.xz | |
mm: Add PG_arch_2 page flag
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>
Diffstat (limited to 'include/linux/kernel-page-flags.h')
| -rw-r--r-- | include/linux/kernel-page-flags.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h index abd20ef93c98..eee1877a354e 100644 --- a/include/linux/kernel-page-flags.h +++ b/include/linux/kernel-page-flags.h @@ -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 */ |