Commit 3ed04e3f authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Frederic Weisbecker
Browse files

rcu: Mark diagnostic functions as notrace 



The rcu_lockdep_current_cpu_online(), rcu_read_lock_sched_held(),
rcu_read_lock_held(), rcu_read_lock_bh_held(), rcu_read_lock_any_held()
are used by tracing-related code paths, so putting traces on them is
unlikely to make anyone happy.  This commit therefore marks them all
"notrace".

Reported-by: default avatarLeon Hwang <leon.hwang@linux.dev>
Reported-by: default avatarAlexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
parent 8c8250ee

kernel/rcu/tree.c

+1 −1
Original line number Diff line number Diff line
@@ -4021,7 +4021,7 @@ bool rcu_cpu_online(int cpu) 
 * RCU on an offline processor during initial boot, hence the check for

 * rcu_scheduler_fully_active.

 */

bool rcu_lockdep_current_cpu_online(void)

bool notrace rcu_lockdep_current_cpu_online(void)

{

	struct rcu_data *rdp;

	bool ret = false;

kernel/rcu/update.c

+4 −4
Original line number Diff line number Diff line
@@ -117,7 +117,7 @@ static bool rcu_read_lock_held_common(bool *ret) 
	return false;

}



int rcu_read_lock_sched_held(void)

int notrace rcu_read_lock_sched_held(void)

{

	bool ret;
@@ -342,7 +342,7 @@ EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); 
 * Note that rcu_read_lock() is disallowed if the CPU is either idle or

 * offline from an RCU perspective, so check for those as well.

 */

int rcu_read_lock_held(void)

int notrace rcu_read_lock_held(void)

{

	bool ret;
@@ -367,7 +367,7 @@ EXPORT_SYMBOL_GPL(rcu_read_lock_held); 
 * Note that rcu_read_lock_bh() is disallowed if the CPU is either idle or

 * offline from an RCU perspective, so check for those as well.

 */

int rcu_read_lock_bh_held(void)

int notrace rcu_read_lock_bh_held(void)

{

	bool ret;
@@ -377,7 +377,7 @@ int rcu_read_lock_bh_held(void) 
}

EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);



int rcu_read_lock_any_held(void)

int notrace rcu_read_lock_any_held(void)

{

	bool ret;