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locking: Remove rt_rwlock_is_contended().

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rt_rwlock_is_contended() has no users. It makes no sense to use it as
rwlock_is_contended() because it is a sleeping lock on RT and
preemption is possible. It reports always != 0 if used by a writer and
even if there is a waiter then the lock might not be handed over if
the current owner has the highest priority.

Remove rt_rwlock_is_contended().

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211129174654.668506-3-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2021-11-29 18:46:45 +01:00 committed by Peter Zijlstra
parent 9d0df37797
commit e08f343be0
1 changed files with 0 additions and 6 deletions
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6
kernel/locking/spinlock_rt.c
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@ -257,12 +257,6 @@ void __sched rt_write_unlock(rwlock_t *rwlock)
}
EXPORT_SYMBOL(rt_write_unlock);
int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
{
return rw_base_is_contended(&rwlock->rwbase);
}
EXPORT_SYMBOL(rt_rwlock_is_contended);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
void __rt_rwlock_init(rwlock_t *rwlock, const char *name,
struct lock_class_key *key)