mm: add FAULT_FLAG_VMA_LOCK flag

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

Link: https://lkml.kernel.org/r/20230227173632.3292573-26-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Laurent Dufour <laurent.dufour@fr.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index fca532a51049877e9f19807ddaf94cf4d98315cd..82ea2ae374de6078e06359ca749539831e640cce 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -478,7 +478,8 @@ 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 bad9f456e88ac9eb81378078a263a75e8bbde053..24a14ab42eef33675030ef34d94892302c30dd30 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1092,6 +1092,7 @@ 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;