diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-02-11 08:05:07 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-02-23 09:04:43 -0800 |
| commit | e086481baf9d0436bdd6e9b739bfa4a83fb89ef5 (patch) | |
| tree | 8c30272e287b2aee92c3f27dc98fb711ea7cb02e | |
| parent | b46f358ae5e3558a9072f0354128d5749a584d01 (diff) | |
| download | linux-e086481baf9d0436bdd6e9b739bfa4a83fb89ef5.tar.bz2 | |
rcutorture: Add a lock_busted to test the test
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>
| -rw-r--r-- | kernel/locking/locktorture.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index d69d20d9c9db..f26b1a18e34e 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -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); |