linux-kernel - [PATCH 4.4 11/11] rcu: Update documentation of rcu_read

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Message-ID: <20210802134624.1934-12-thunder.leizhen@huawei.com>
Date:   Mon, 2 Aug 2021 21:46:24 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Mike Galbraith <efault@....de>,
        Sasha Levin <sasha.levin@...cle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 4.4 11/11] rcu: Update documentation of rcu_read_unlock()

From: Anna-Maria Gleixner <anna-maria@...utronix.de>

[ Upstream commit ec84b27f9b3b569f9235413d1945a2006b97b0aa ]

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wait_lock is no longer valid.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@...ssion.com>
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: bigeasy@...utronix.de
Link: https://lkml.kernel.org/r/20180525090507.22248-2-anna-maria@linutronix.de
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 include/linux/rcupdate.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 0a93e9d1708e29e..3072e9c93ae6be2 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -880,9 +880,7 @@ static __always_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
-- 
2.26.0.106.g9fadedd