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rcutorture: Make rcutorture support srcu double call test

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This commit allows rcutorture to test double-call_srcu() when the
CONFIG_DEBUG_OBJECTS_RCU_HEAD Kconfig option is enabled.  The non-raw
sdp structure's ->spinlock will be acquired in call_srcu(), hence this
commit also removes the current IRQ and preemption disabling so as to
avoid lockdep complaints.

Link: https://lore.kernel.org/all/20240407112714.24460-1-qiang.zhang1211@gmail.com/

Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zqiang 2024-04-07 19:27:14 +08:00 committed by Paul E. McKenney
parent 1613e604df
commit 43b39cafba
1 changed files with 26 additions and 20 deletions
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46
kernel/rcu/rcutorture.c
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@ -390,6 +390,7 @@ struct rcu_torture_ops {
int extendables;
int slow_gps;
int no_pi_lock;
int debug_objects;
const char *name;
};
@ -577,6 +578,7 @@ static struct rcu_torture_ops rcu_ops = {
.irq_capable = 1,
.can_boost = IS_ENABLED(CONFIG_RCU_BOOST),
.extendables = RCUTORTURE_MAX_EXTEND,
.debug_objects = 1,
.name = "rcu"
};
@ -747,6 +749,7 @@ static struct rcu_torture_ops srcu_ops = {
.cbflood_max = 50000,
.irq_capable = 1,
.no_pi_lock = IS_ENABLED(CONFIG_TINY_SRCU),
.debug_objects = 1,
.name = "srcu"
};
@ -786,6 +789,7 @@ static struct rcu_torture_ops srcud_ops = {
.cbflood_max = 50000,
.irq_capable = 1,
.no_pi_lock = IS_ENABLED(CONFIG_TINY_SRCU),
.debug_objects = 1,
.name = "srcud"
};
@ -3455,7 +3459,6 @@ rcu_torture_cleanup(void)
cur_ops->gp_slow_unregister(NULL);
}
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
static void rcu_torture_leak_cb(struct rcu_head *rhp)
{
}
@ -3473,7 +3476,6 @@ static void rcu_torture_err_cb(struct rcu_head *rhp)
*/
pr_alert("%s: duplicated callback was invoked.\n", KBUILD_MODNAME);
}
#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
/*
* Verify that double-free causes debug-objects to complain, but only
@ -3482,39 +3484,43 @@ static void rcu_torture_err_cb(struct rcu_head *rhp)
*/
static void rcu_test_debug_objects(void)
{
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
struct rcu_head rh1;
struct rcu_head rh2;
int idx;
if (!IS_ENABLED(CONFIG_DEBUG_OBJECTS_RCU_HEAD)) {
pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_%s()\n",
KBUILD_MODNAME, cur_ops->name);
return;
}
if (WARN_ON_ONCE(cur_ops->debug_objects &&
(!cur_ops->call || !cur_ops->cb_barrier)))
return;
struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
init_rcu_head_on_stack(&rh1);
init_rcu_head_on_stack(&rh2);
pr_alert("%s: WARN: Duplicate call_rcu() test starting.\n", KBUILD_MODNAME);
pr_alert("%s: WARN: Duplicate call_%s() test starting.\n", KBUILD_MODNAME, cur_ops->name);
/* Try to queue the rh2 pair of callbacks for the same grace period. */
preempt_disable(); /* Prevent preemption from interrupting test. */
rcu_read_lock(); /* Make it impossible to finish a grace period. */
call_rcu_hurry(&rh1, rcu_torture_leak_cb); /* Start grace period. */
local_irq_disable(); /* Make it harder to start a new grace period. */
call_rcu_hurry(&rh2, rcu_torture_leak_cb);
call_rcu_hurry(&rh2, rcu_torture_err_cb); /* Duplicate callback. */
idx = cur_ops->readlock(); /* Make it impossible to finish a grace period. */
cur_ops->call(&rh1, rcu_torture_leak_cb); /* Start grace period. */
cur_ops->call(&rh2, rcu_torture_leak_cb);
cur_ops->call(&rh2, rcu_torture_err_cb); /* Duplicate callback. */
if (rhp) {
call_rcu_hurry(rhp, rcu_torture_leak_cb);
call_rcu_hurry(rhp, rcu_torture_err_cb); /* Another duplicate callback. */
cur_ops->call(rhp, rcu_torture_leak_cb);
cur_ops->call(rhp, rcu_torture_err_cb); /* Another duplicate callback. */
}
local_irq_enable();
rcu_read_unlock();
preempt_enable();
cur_ops->readunlock(idx);
/* Wait for them all to get done so we can safely return. */
rcu_barrier();
pr_alert("%s: WARN: Duplicate call_rcu() test complete.\n", KBUILD_MODNAME);
cur_ops->cb_barrier();
pr_alert("%s: WARN: Duplicate call_%s() test complete.\n", KBUILD_MODNAME, cur_ops->name);
destroy_rcu_head_on_stack(&rh1);
destroy_rcu_head_on_stack(&rh2);
kfree(rhp);
#else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n", KBUILD_MODNAME);
#endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
}
static void rcutorture_sync(void)