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authorSteven Price <steven.price@arm.com>2020-04-22 15:25:27 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2020-09-04 12:46:06 +0100
commit4beba9486abd2f86d125271d6946f7c38ed0fe77 (patch)
treeb6077490a328fe217ca4f359ceea847872f3f4cd /fs/proc
parent637ec831ea4f09c7529ac4078399ce4e25b46341 (diff)
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 'fs/proc')
-rw-r--r--fs/proc/page.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/proc/page.c b/fs/proc/page.c
index f909243d4a66..9f1077d94cde 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -217,6 +217,9 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2);
u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1);
u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1);
+#ifdef CONFIG_64BIT
+ u |= kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2);
+#endif
return u;
};