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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2020-06-12 16:51:50 +0200 |
|---|---|---|
| committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2020-06-16 13:36:43 +0200 |
| commit | 6076f77843a67c6bf5075a7e38a5c9ff0554680b (patch) | |
| tree | 9d1ee3ef7858e99ff6582baca2566e4805077c06 /kernel | |
| parent | 262a25ed2ec4c8f98327e258e770e6905c3b8655 (diff) | |
| download | linux-rt-6076f77843a67c6bf5075a7e38a5c9ff0554680b.tar.gz | |
rwsem: Provide down_read_non_owner() and up_read_non_owner() for -RT
The rwsem implementation on -RT allows multiple reader and there is no
owner tracking anymore.
We can provide down_read_non_owner() and up_read_non_owner() by skipping
the owner check bits which are only available in the !RT implementation.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/rwsem.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c index fc6c6c8d3127..6416a10e7942 100644 --- a/kernel/locking/rwsem.c +++ b/kernel/locking/rwsem.c @@ -1616,15 +1616,15 @@ void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest) } EXPORT_SYMBOL(_down_write_nest_lock); -#ifndef CONFIG_PREEMPT_RT void down_read_non_owner(struct rw_semaphore *sem) { might_sleep(); __down_read(sem); +#ifndef CONFIG_PREEMPT_RT __rwsem_set_reader_owned(sem, NULL); +#endif } EXPORT_SYMBOL(down_read_non_owner); -#endif void down_write_nested(struct rw_semaphore *sem, int subclass) { @@ -1649,13 +1649,13 @@ int __sched down_write_killable_nested(struct rw_semaphore *sem, int subclass) } EXPORT_SYMBOL(down_write_killable_nested); -#ifndef CONFIG_PREEMPT_RT void up_read_non_owner(struct rw_semaphore *sem) { +#ifndef CONFIG_PREEMPT_RT DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem), sem); +#endif __up_read(sem); } EXPORT_SYMBOL(up_read_non_owner); -#endif #endif |