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rcutorture: Add a lock_busted to test the test

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This commit adds a maximally broken locking primitive in which
lock acquisition and release are both no-ops.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2014-02-11 08:05:07 -08:00
parent b46f358ae5
commit e086481baf
1 changed files with 32 additions and 1 deletions
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33
kernel/locking/locktorture.c
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@ -112,6 +112,37 @@ static struct lock_torture_ops *cur_ops;
* Definitions for lock torture testing.
*/
static int torture_lock_busted_write_lock(void)
{
return 0; /* BUGGY, do not use in real life!!! */
}
static void torture_lock_busted_write_delay(struct torture_random_state *trsp)
{
const unsigned long longdelay_us = 100;
/* We want a long delay occasionally to force massive contention. */
if (!(torture_random(trsp) %
(nrealwriters_stress * 2000 * longdelay_us)))
mdelay(longdelay_us);
#ifdef CONFIG_PREEMPT
if (!(torture_random(trsp) % (nrealwriters_stress * 20000)))
preempt_schedule(); /* Allow test to be preempted. */
#endif
}
static void torture_lock_busted_write_unlock(void)
{
/* BUGGY, do not use in real life!!! */
}
static struct lock_torture_ops lock_busted_ops = {
.writelock = torture_lock_busted_write_lock,
.write_delay = torture_lock_busted_write_delay,
.writeunlock = torture_lock_busted_write_unlock,
.name = "lock_busted"
};
static DEFINE_SPINLOCK(torture_spinlock);
static int torture_spin_lock_write_lock(void) __acquires(torture_spinlock)
@ -320,7 +351,7 @@ static int __init lock_torture_init(void)
int i;
int firsterr = 0;
static struct lock_torture_ops *torture_ops[] = {
&spin_lock_ops, &spin_lock_irq_ops,
&lock_busted_ops, &spin_lock_ops, &spin_lock_irq_ops,
};
torture_init_begin(torture_type, verbose, &locktorture_runnable);