linux-kernel - [PATCH 4/4] kernel/futex: Explicitly document pi_lock for pi

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Date:   Fri, 26 Feb 2021 09:50:29 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     tglx@...utronix.de
Cc:     mingo@...hat.com, peterz@...radead.org, dvhart@...radead.org,
        dave@...olabs.net, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 4/4] kernel/futex: Explicitly document pi_lock for pi_state owner fixup

This seems to belong in the serialization and lifetime rules section.
pi_state_update_owner() will take the pi_mutex's owner's pi_lock to
do whatever fixup, successful or not.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 kernel/futex.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/futex.c b/kernel/futex.c
index dcd6132485e1..475055715371 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -981,6 +981,7 @@ static inline void exit_pi_state_list(struct task_struct *curr) { }
  * p->pi_lock:
  *
  *	p->pi_state_list -> pi_state->list, relation
+ *	pi_mutex->owner -> pi_state->owner, relation
  *
  * pi_state->refcount:
  *
-- 
2.26.2