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authorAnna-Maria Gleixner <anna-maria@linutronix.de>2018-05-25 11:05:06 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-06-10 06:14:01 +0200
commitec84b27f9b3b569f9235413d1945a2006b97b0aa (patch)
tree77589775e474b62b675e810c2856a9ca8f33a7ec
parentcd77849a69cf5d81a86dd88dac7a594a67cb5c87 (diff)
downloadlinux-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Make wait_lock irq safe") the explanation in rcu_read_unlock() documentation about irq unsafe rtmutex wait_lock is no longer valid.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.h4
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