linux-kernel - [tip: locking/core] kernel/futex: Explicitly document pi_lock for pi

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Message-ID: <161548709438.398.306866505204753434.tip-bot2@tip-bot2>
Date:   Thu, 11 Mar 2021 18:24:54 -0000
From:   "tip-bot2 for Davidlohr Bueso" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Davidlohr Bueso <dbueso@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: locking/core] kernel/futex: Explicitly document pi_lock for
 pi_state owner fixup

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     c2e4bfe0eef313eeb1c4c9d921be7a9d91d5d71a
Gitweb:        https://git.kernel.org/tip/c2e4bfe0eef313eeb1c4c9d921be7a9d91d5d71a
Author:        Davidlohr Bueso <dave@...olabs.net>
AuthorDate:    Fri, 26 Feb 2021 09:50:29 -08:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 11 Mar 2021 19:19:17 +01:00

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>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20210226175029.50335-4-dave@stgolabs.net

---
 kernel/futex.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/futex.c b/kernel/futex.c
index dcd6132..4750557 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:
  *