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authorSteven Price <steven.price@arm.com>2020-04-22 17:25:27 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2020-09-04 14:46:06 +0300
commit4beba9486abd2f86d125271d6946f7c38ed0fe77 (patch)
treeb6077490a328fe217ca4f359ceea847872f3f4cd /include/linux/kernel-page-flags.h
parent637ec831ea4f09c7529ac4078399ce4e25b46341 (diff)
downloadlinux-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.h1
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 */