From: Suren Baghdasaryan <surenb@google.com>
Date: Sun, 29 May 2022 20:19:31 +0000 (-0700)
Subject: mm: add FAULT_FLAG_VMA_LOCK flag
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=592fb19f3c55cd420ff7ed1a5ac6277c466ff6b2;p=users%2Fjedix%2Flinux-maple.git

mm: add FAULT_FLAG_VMA_LOCK flag

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

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Laurent Dufour <laurent.dufour@fr.ibm.com>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d2c1e03c8088..3d11db9f2c32 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -466,7 +466,8 @@ 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 d6952df03afa..0d1e7c7b0acf 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1032,6 +1032,7 @@ 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;