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Subject[RFC PATCH 07/37] mm: add FAULT_FLAG_SPECULATIVE flag
Date
Define the new FAULT_FLAG_SPECULATIVE flag, which indicates when we are
attempting speculative fault handling (without holding the mmap lock).

Signed-off-by: Michel Lespinasse <michel@lespinasse.org>
---
include/linux/mm.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8ba434287387..021fdab5b721 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -434,6 +434,7 @@ extern pgprot_t protection_map[16];
* @FAULT_FLAG_REMOTE: The fault is not for current task/mm.
* @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch.
* @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals.
+ * @FAULT_FLAG_SPECULATIVE: The fault is handled without holding the mmap_sem.
*
* About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify
* whether we would allow page faults to retry by specifying these two
@@ -464,6 +465,7 @@ extern pgprot_t protection_map[16];
#define FAULT_FLAG_REMOTE 0x80
#define FAULT_FLAG_INSTRUCTION 0x100
#define FAULT_FLAG_INTERRUPTIBLE 0x200
+#define FAULT_FLAG_SPECULATIVE 0x400

/*
* The default fault flags that should be used by most of the
@@ -501,7 +503,8 @@ static inline bool fault_flag_allow_retry_first(unsigned int flags)
{ FAULT_FLAG_USER, "USER" }, \
{ FAULT_FLAG_REMOTE, "REMOTE" }, \
{ FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \
- { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }
+ { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }, \
+ { FAULT_FLAG_SPECULATIVE, "SPECULATIVE" }

/*
* vm_fault is filled by the pagefault handler and passed to the vma's
--
2.20.1
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