| From | Michel Lespinasse <> | Subject | [PATCH v2 08/35] mm: add FAULT_FLAG_SPECULATIVE flag | Date | Fri, 28 Jan 2022 05:09:39 -0800 |
| |
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 | 3 ++- include/linux/mm_types.h | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h index e1a84b1e6787..7f7aa3f0a396 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -461,7 +461,8 @@ 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_SPECULATIVE, "SPECULATIVE" } /* * 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 9db36dc5d4cf..0ae3bf854aad 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -790,6 +790,7 @@ typedef struct { * @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 lock. * * About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify * whether we would allow page faults to retry by specifying these two @@ -821,6 +822,7 @@ enum fault_flag { FAULT_FLAG_REMOTE = 1 << 7, FAULT_FLAG_INSTRUCTION = 1 << 8, FAULT_FLAG_INTERRUPTIBLE = 1 << 9, + FAULT_FLAG_SPECULATIVE = 1 << 10, }; #endif /* _LINUX_MM_TYPES_H */ -- 2.20.1
|