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| author | Anna-Maria Gleixner <anna-maria@linutronix.de> | 2018-05-25 11:05:06 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-10 06:14:01 +0200 |
| commit | ec84b27f9b3b569f9235413d1945a2006b97b0aa (patch) | |
| tree | 77589775e474b62b675e810c2856a9ca8f33a7ec | |
| parent | cd77849a69cf5d81a86dd88dac7a594a67cb5c87 (diff) | |
| download | linux-ec84b27f9b3b569f9235413d1945a2006b97b0aa.tar.bz2 | |
rcu: Update documentation of rcu_read_unlock()
Since commit b4abf91047cf ("rtmutex: Make wait_lock irq safe") the
explanation in rcu_read_unlock() documentation about irq unsafe rtmutex
wait_lock is no longer valid.
Remove it to prevent kernel developers reading the documentation to rely on
it.
Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: bigeasy@linutronix.de
Link: https://lkml.kernel.org/r/20180525090507.22248-2-anna-maria@linutronix.de
| -rw-r--r-- | include/linux/rcupdate.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index e679b175b411..65163aa0bb04 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -652,9 +652,7 @@ static inline void rcu_read_lock(void) * Unfortunately, this function acquires the scheduler's runqueue and * priority-inheritance spinlocks. This means that deadlock could result * if the caller of rcu_read_unlock() already holds one of these locks or - * any lock that is ever acquired while holding them; or any lock which - * can be taken from interrupt context because rcu_boost()->rt_mutex_lock() - * does not disable irqs while taking ->wait_lock. + * any lock that is ever acquired while holding them. * * That said, RCU readers are never priority boosted unless they were * preempted. Therefore, one way to avoid deadlock is to make sure |