[PATCH 30/41] mm: add FAULT_FLAG_VMA_LOCK flag

[Suren Baghdasaryan]

Add a new flag to distinguish page faults handled under protection of
per-vma lock.

Signed-off-by: Suren Baghdasaryan <sur...@google.com>
Reviewed-by: Laurent Dufour <laurent.duf...@fr.ibm.com>
---
 include/linux/mm.h       | 3 ++-
 include/linux/mm_types.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d0fddf6a1de9..2e3be1d45371 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -467,7 +467,8 @@ static inline bool fault_flag_allow_retry_first(enum 
fault_flag flags)
        { FAULT_FLAG_USER,              "USER" }, \
        { FAULT_FLAG_REMOTE,            "REMOTE" }, \
        { FAULT_FLAG_INSTRUCTION,       "INSTRUCTION" }, \
-       { FAULT_FLAG_INTERRUPTIBLE,     "INTERRUPTIBLE" }
+       { FAULT_FLAG_INTERRUPTIBLE,     "INTERRUPTIBLE" }, \
+       { FAULT_FLAG_VMA_LOCK,          "VMA_LOCK" }
 
 /*
  * vm_fault is filled by the pagefault handler and passed to the vma's
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0d27edd3e63a..fce9113d979c 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1103,6 +1103,7 @@ enum fault_flag {
        FAULT_FLAG_INTERRUPTIBLE =      1 << 9,
        FAULT_FLAG_UNSHARE =            1 << 10,
        FAULT_FLAG_ORIG_PTE_VALID =     1 << 11,
+       FAULT_FLAG_VMA_LOCK =           1 << 12,
 };
 
 typedef unsigned int __bitwise zap_flags_t;
-- 
2.39.0