Messages in this thread Patch in this message | | | From | Joel Fernandes <> | Subject | [PATCH RFC v5 2/6] srcu: Add notrace variants of srcu_read_{lock,unlock} | Date | Mon, 30 Apr 2018 18:42:00 -0700 |
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From: "Paul E. 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]
Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zilstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Tom Zanussi <tom.zanussi@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Thomas Glexiner <tglx@linutronix.de> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Fenguang Wu <fengguang.wu@intel.com> Cc: Baohong Liu <baohong.liu@intel.com> Cc: Vedang Patel <vedang.patel@intel.com> Cc: kernel-team@android.com Signed-off-by: Paul McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Joel Fernandes <joelaf@google.com> --- 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 * -- 2.17.0.441.gb46fe60e1d-goog
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