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From: joelaf@google.com (Joel Fernandes)
Subject: [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock,unlock}
Date: Thu,  7 Jun 2018 13:38:09 -0700	[thread overview]
Message-ID: <20180607203815.255845-2-joel@joelfernandes.org> (raw)
Message-ID: <20180607203809.R6U_H1CHBQMvBMlGCTqP27LPdXfm6GGgLmHsMPJJtwU@z> (raw)
In-Reply-To: <20180607203815.255845-1-joel@joelfernandes.org>

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 at goodmis.org>
Signed-off-by: Paul McKenney <paulmck at linux.vnet.ibm.com>
Signed-off-by: Joel Fernandes (Google) <joel at joelfernandes.org>
---
 include/linux/srcu.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 33c1c698df09..2ec618979b20 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -161,6 +161,16 @@ 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.
@@ -175,6 +185,13 @@ 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
  *
-- 
2.17.1.1185.g55be947832-goog

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  reply	other threads:[~2018-06-07 20:38 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-07 20:38 [PATCH v9 0/7] Centralize and unify usage of preempt/irq Joel Fernandes
2018-06-07 20:38 ` Joel Fernandes
2018-06-07 20:38 ` joelaf
2018-06-07 20:38 ` Joel Fernandes [this message]
2018-06-07 20:38   ` [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 2/7] srcu: Add notrace variant of srcu_dereference Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 3/7] trace/irqsoff: Split reset into separate functions Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 4/7] tracepoint: Make rcuidle tracepoint callers use SRCU Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 5/7] tracing: Centralize preemptirq tracepoints and unify their usage Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 6/7] lib: Add module to simulate atomic sections for testing preemptoff tracers Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-07 20:38 ` [PATCH v9 7/7] kselftests: Add tests for the preemptoff and irqsoff tracers Joel Fernandes
2018-06-07 20:38   ` Joel Fernandes
2018-06-07 20:38   ` joelaf
2018-06-21 22:32 [PATCH v9 0/7] Centralize and unify usage of preempt/irq tracepoints Joel Fernandes
2018-06-21 22:32 ` [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes
2018-06-21 22:32   ` Joel Fernandes
2018-06-21 22:32   ` joel
2018-06-28 18:21 [PATCH v9 0/7] Centralize and unify usage of preempt/irq tracepoints Joel Fernandes
2018-06-28 18:21 ` [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes
2018-06-28 18:21   ` Joel Fernandes
2018-06-28 18:21   ` joel
2018-06-28 18:21 [PATCH v9 0/7] Centralize and unify usage of preempt/irq tracepoints Joel Fernandes
2018-06-28 18:21 ` [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes
2018-06-28 18:21   ` Joel Fernandes
2018-06-28 18:21   ` joel

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