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Commit aa23c6fb authored by Pranith Kumar's avatar Pranith Kumar Committed by Paul E. McKenney
Browse files

rcutorture: Add early boot self tests 



Add early boot self tests for RCU under CONFIG_PROVE_RCU.

Currently the only test is adding a dummy callback which increments a counter
which we then later verify after calling rcu_barrier*().

Signed-off-by: default avatarPranith Kumar <bobby.prani@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 2f3fd499

kernel/rcu/rcu.h

+2 −0
Original line number Diff line number Diff line
@@ -135,4 +135,6 @@ int rcu_jiffies_till_stall_check(void); 
 */

#define TPS(x)  tracepoint_string(x)



void rcu_early_boot_tests(void);



#endif /* __LINUX_RCU_H */

kernel/rcu/tiny.c

+3 −1
Original line number Diff line number Diff line
@@ -380,7 +380,9 @@ void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) 
}

EXPORT_SYMBOL_GPL(call_rcu_bh);



void rcu_init(void)

void __init rcu_init(void)

{

	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);



	rcu_early_boot_tests();

}

kernel/rcu/tree.c

+2 −0
Original line number Diff line number Diff line
@@ -3766,6 +3766,8 @@ void __init rcu_init(void) 
	pm_notifier(rcu_pm_notify, 0);

	for_each_online_cpu(cpu)

		rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu);



	rcu_early_boot_tests();

}



#include "tree_plugin.h"

kernel/rcu/update.c

+84 −0
Original line number Diff line number Diff line
@@ -690,3 +690,87 @@ static void rcu_spawn_tasks_kthread(void) 
}



#endif /* #ifdef CONFIG_TASKS_RCU */



#ifdef CONFIG_PROVE_RCU



/*

 * Early boot self test parameters, one for each flavor

 */

static bool rcu_self_test;

static bool rcu_self_test_bh;

static bool rcu_self_test_sched;



module_param(rcu_self_test, bool, 0444);

module_param(rcu_self_test_bh, bool, 0444);

module_param(rcu_self_test_sched, bool, 0444);



static int rcu_self_test_counter;



static void test_callback(struct rcu_head *r)

{

	rcu_self_test_counter++;

	pr_info("RCU test callback executed %d\n", rcu_self_test_counter);

}



static void early_boot_test_call_rcu(void)

{

	static struct rcu_head head;



	call_rcu(&head, test_callback);

}



static void early_boot_test_call_rcu_bh(void)

{

	static struct rcu_head head;



	call_rcu_bh(&head, test_callback);

}



static void early_boot_test_call_rcu_sched(void)

{

	static struct rcu_head head;



	call_rcu_sched(&head, test_callback);

}



void rcu_early_boot_tests(void)

{

	pr_info("Running RCU self tests\n");



	if (rcu_self_test)

		early_boot_test_call_rcu();

	if (rcu_self_test_bh)

		early_boot_test_call_rcu_bh();

	if (rcu_self_test_sched)

		early_boot_test_call_rcu_sched();

}



static int rcu_verify_early_boot_tests(void)

{

	int ret = 0;

	int early_boot_test_counter = 0;



	if (rcu_self_test) {

		early_boot_test_counter++;

		rcu_barrier();

	}

	if (rcu_self_test_bh) {

		early_boot_test_counter++;

		rcu_barrier_bh();

	}

	if (rcu_self_test_sched) {

		early_boot_test_counter++;

		rcu_barrier_sched();

	}



	if (rcu_self_test_counter != early_boot_test_counter) {

		WARN_ON(1);

		ret = -1;

	}



	return ret;

}

late_initcall(rcu_verify_early_boot_tests);

#else

void rcu_early_boot_tests(void) {}

#endif /* CONFIG_PROVE_RCU */