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[v9,1/7] srcu: Add notrace variants of srcu_read_{lock,unlock}

Message ID 20180621223236.211495-2-joel@joelfernandes.org (mailing list archive)
State New
Headers show

Commit Message

Joel Fernandes June 21, 2018, 10:32 p.m. UTC
From: Paul McKenney <paulmck@linux.vnet.ibm.com>

This is needed for a future tracepoint patch that uses srcu, and to make
sure it doesn't call into lockdep.

tracepoint code already calls notrace variants for rcu_read_lock_sched
so this patch does the same for srcu which will be used in a later
patch. Keeps it consistent with rcu-sched.

[Joel: Added commit message]
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Paul McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
 include/linux/srcu.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 91494d7e8e41..3e72a291c401 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -195,6 +195,16 @@  static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
 	return retval;
+/* Used by tracing, cannot be traced and cannot invoke lockdep. */
+static inline notrace int
+srcu_read_lock_notrace(struct srcu_struct *sp) __acquires(sp)
+	int retval;
+	retval = __srcu_read_lock(sp);
+	return retval;
  * srcu_read_unlock - unregister a old reader from an SRCU-protected structure.
  * @sp: srcu_struct in which to unregister the old reader.
@@ -209,6 +219,13 @@  static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
 	__srcu_read_unlock(sp, idx);
+/* Used by tracing, cannot be traced and cannot call lockdep. */
+static inline notrace void
+srcu_read_unlock_notrace(struct srcu_struct *sp, int idx) __releases(sp)
+	__srcu_read_unlock(sp, idx);
  * smp_mb__after_srcu_read_unlock - ensure full ordering after srcu_read_unlock