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locktorture: Add raw_spinlock* torture tests for PREEMPT_RT kernels 

In PREEMPT_RT kernels, both spin_lock() and spin_lock_irq() are converted
to sleepable rt_spin_lock().  This means that the interrupt related
suffixes for spin_lock/unlock(_irq, irqsave/irqrestore) do not affect
the CPU's interrupt state. This commit therefore adds raw spin-lock
torture tests.  This in turn permits pure spin locks to be tested in
PREEMPT_RT kernels.

Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Suggested-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zqiang 2023-02-24 09:20:35 +08:00 committed by Paul E. McKenney
parent 45bcf0bd8c
commit 5d65cf6ae6
1 changed files with 55 additions and 1 deletions
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56
kernel/locking/locktorture.c
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@ -55,7 +55,7 @@ torture_param(int, nested_locks, 0, "Number of nested locks (max = 8)");
/* Going much higher trips "BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!" errors */
#define MAX_NESTED_LOCKS 8
static char *torture_type = "spin_lock";
static char *torture_type = IS_ENABLED(CONFIG_PREEMPT_RT) ? "raw_spin_lock" : "spin_lock";
module_param(torture_type, charp, 0444);
MODULE_PARM_DESC(torture_type,
"Type of lock to torture (spin_lock, spin_lock_irq, mutex_lock, ...)");
@ -257,6 +257,59 @@ static struct lock_torture_ops spin_lock_irq_ops = {
.name = "spin_lock_irq"
};
static DEFINE_RAW_SPINLOCK(torture_raw_spinlock);
static int torture_raw_spin_lock_write_lock(int tid __maybe_unused)
__acquires(torture_raw_spinlock)
{
raw_spin_lock(&torture_raw_spinlock);
return 0;
}
static void torture_raw_spin_lock_write_unlock(int tid __maybe_unused)
__releases(torture_raw_spinlock)
{
raw_spin_unlock(&torture_raw_spinlock);
}
static struct lock_torture_ops raw_spin_lock_ops = {
.writelock = torture_raw_spin_lock_write_lock,
.write_delay = torture_spin_lock_write_delay,
.task_boost = torture_rt_boost,
.writeunlock = torture_raw_spin_lock_write_unlock,
.readlock = NULL,
.read_delay = NULL,
.readunlock = NULL,
.name = "raw_spin_lock"
};
static int torture_raw_spin_lock_write_lock_irq(int tid __maybe_unused)
__acquires(torture_raw_spinlock)
{
unsigned long flags;
raw_spin_lock_irqsave(&torture_raw_spinlock, flags);
cxt.cur_ops->flags = flags;
return 0;
}
static void torture_raw_spin_lock_write_unlock_irq(int tid __maybe_unused)
__releases(torture_raw_spinlock)
{
raw_spin_unlock_irqrestore(&torture_raw_spinlock, cxt.cur_ops->flags);
}
static struct lock_torture_ops raw_spin_lock_irq_ops = {
.writelock = torture_raw_spin_lock_write_lock_irq,
.write_delay = torture_spin_lock_write_delay,
.task_boost = torture_rt_boost,
.writeunlock = torture_raw_spin_lock_write_unlock_irq,
.readlock = NULL,
.read_delay = NULL,
.readunlock = NULL,
.name = "raw_spin_lock_irq"
};
static DEFINE_RWLOCK(torture_rwlock);
static int torture_rwlock_write_lock(int tid __maybe_unused)
@ -1017,6 +1070,7 @@ static int __init lock_torture_init(void)
static struct lock_torture_ops *torture_ops[] = {
&lock_busted_ops,
&spin_lock_ops, &spin_lock_irq_ops,
&raw_spin_lock_ops, &raw_spin_lock_irq_ops,
&rw_lock_ops, &rw_lock_irq_ops,
&mutex_lock_ops,
&ww_mutex_lock_ops,