[PATCH v2 08/16] srcu: Mark the fast notrace read-side helpers notrace

[Song Liu]

srcu_read_lock_fast_notrace() and srcu_read_unlock_fast_notrace() are
used by tracepoints, and their comments say they cannot be traced. They
are plain inline functions, as are srcu_check_read_flavor() and the
Tiny SRCU versions of __srcu_read_lock_fast() and
__srcu_read_unlock_fast() that they call. An out-of-line copy of any of
them is untraced only because inline implies notrace.

Mark them notrace explicitly, as srcu_read_lock_notrace() and the Tree
SRCU __srcu_read_lock_fast() and __srcu_read_unlock_fast() already are.
No functional change.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@xxxxxxxxxx>
---
 include/linux/srcu.h     | 8 +++++---
 include/linux/srcutiny.h | 5 +++--
 include/linux/srcutree.h | 2 +-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index bce8cac45474..1ed3fc50b77f 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -377,7 +377,8 @@ static inline struct srcu_ctr __percpu *srcu_read_lock_fast_updown(struct srcu_s
  * Used by tracing, cannot be traced and cannot call lockdep.
  * See srcu_read_lock_fast() for more information.
  */
-static inline struct srcu_ctr __percpu *srcu_read_lock_fast_notrace(struct srcu_struct *ssp)
+static inline struct srcu_ctr __percpu notrace *
+srcu_read_lock_fast_notrace(struct srcu_struct *ssp)
 	__acquires_shared(ssp)
 {
 	struct srcu_ctr __percpu *retval;
@@ -524,8 +525,9 @@ srcu_read_unlock_fast_updown(struct srcu_struct *ssp, struct srcu_ctr __percpu *
  * Used by tracing, cannot be traced and cannot call lockdep.
  * See srcu_read_unlock_fast() for more information.
  */
-static inline void srcu_read_unlock_fast_notrace(struct srcu_struct *ssp,
-						 struct srcu_ctr __percpu *scp) __releases_shared(ssp)
+static inline void notrace
+srcu_read_unlock_fast_notrace(struct srcu_struct *ssp,
+			      struct srcu_ctr __percpu *scp) __releases_shared(ssp)
 {
 	srcu_check_read_flavor(ssp, SRCU_READ_FLAVOR_FAST);
 	__srcu_read_unlock_fast(ssp, scp);
diff --git a/include/linux/srcutiny.h b/include/linux/srcutiny.h
index 905b629e8fa3..fdb988d41167 100644
--- a/include/linux/srcutiny.h
+++ b/include/linux/srcutiny.h
@@ -101,13 +101,14 @@ static inline struct srcu_ctr __percpu *__srcu_ctr_to_ptr(struct srcu_struct *ss
 	return (struct srcu_ctr __percpu *)(intptr_t)idx;
 }
 
-static inline struct srcu_ctr __percpu *__srcu_read_lock_fast(struct srcu_struct *ssp)
+static inline struct srcu_ctr __percpu notrace *__srcu_read_lock_fast(struct srcu_struct *ssp)
 	__acquires_shared(ssp)
 {
 	return __srcu_ctr_to_ptr(ssp, __srcu_read_lock(ssp));
 }
 
-static inline void __srcu_read_unlock_fast(struct srcu_struct *ssp, struct srcu_ctr __percpu *scp)
+static inline void notrace
+__srcu_read_unlock_fast(struct srcu_struct *ssp, struct srcu_ctr __percpu *scp)
 	__releases_shared(ssp)
 {
 	__srcu_read_unlock(ssp, __srcu_ptr_to_ctr(ssp, scp));
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
index fd1a9270cb9a..8328218a34fa 100644
--- a/include/linux/srcutree.h
+++ b/include/linux/srcutree.h
@@ -368,7 +368,7 @@ __srcu_read_unlock_fast_updown(struct srcu_struct *ssp, struct srcu_ctr __percpu
 void __srcu_check_read_flavor(struct srcu_struct *ssp, int read_flavor);
 
 // Record SRCU-reader usage type only for CONFIG_PROVE_RCU=y kernels.
-static inline void srcu_check_read_flavor(struct srcu_struct *ssp, int read_flavor)
+static inline void notrace srcu_check_read_flavor(struct srcu_struct *ssp, int read_flavor)
 {
 	if (IS_ENABLED(CONFIG_PROVE_RCU))
 		__srcu_check_read_flavor(ssp, read_flavor);
-- 
2.53.0-Meta