LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	juri.lelli@arm.com, bigeasy@linutronix.de, xlpang@redhat.com,
	rostedt@goodmis.org, mathieu.desnoyers@efficios.com,
	jdesfossez@efficios.com, dvhart@infradead.org,
	bristot@redhat.com, Thomas Gleixner <tglx@linutronix.de>,
	Zhen Lei <thunder.leizhen@huawei.com>,
	Joe Korty <joe.korty@concurrent-rt.com>
Subject: [PATCH 4.4 03/11] futex,rt_mutex: Introduce rt_mutex_init_waiter()
Date: Sun,  8 Aug 2021 09:22:38 +0200	[thread overview]
Message-ID: <20210808072217.435137340@linuxfoundation.org> (raw)
In-Reply-To: <20210808072217.322468704@linuxfoundation.org>

From: Peter Zijlstra <peterz@infradead.org>

[ Upstream commit 50809358dd7199aa7ce232f6877dd09ec30ef374 ]

Since there's already two copies of this code, introduce a helper now
before adding a third one.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: juri.lelli@arm.com
Cc: bigeasy@linutronix.de
Cc: xlpang@redhat.com
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@efficios.com
Cc: jdesfossez@efficios.com
Cc: dvhart@infradead.org
Cc: bristot@redhat.com
Link: http://lkml.kernel.org/r/20170322104151.950039479@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Joe Korty <joe.korty@concurrent-rt.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/futex.c                  |    5 +----
 kernel/locking/rtmutex.c        |   12 +++++++++---
 kernel/locking/rtmutex_common.h |    1 +
 3 files changed, 11 insertions(+), 7 deletions(-)

--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -3156,10 +3156,7 @@ static int futex_wait_requeue_pi(u32 __u
 	 * The waiter is allocated on our stack, manipulated by the requeue
 	 * code while we sleep on uaddr.
 	 */
-	debug_rt_mutex_init_waiter(&rt_waiter);
-	RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
-	RB_CLEAR_NODE(&rt_waiter.tree_entry);
-	rt_waiter.task = NULL;
+	rt_mutex_init_waiter(&rt_waiter);
 
 	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
 	if (unlikely(ret != 0))
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1155,6 +1155,14 @@ void rt_mutex_adjust_pi(struct task_stru
 				   next_lock, NULL, task);
 }
 
+void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
+{
+	debug_rt_mutex_init_waiter(waiter);
+	RB_CLEAR_NODE(&waiter->pi_tree_entry);
+	RB_CLEAR_NODE(&waiter->tree_entry);
+	waiter->task = NULL;
+}
+
 /**
  * __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop
  * @lock:		 the rt_mutex to take
@@ -1236,9 +1244,7 @@ rt_mutex_slowlock(struct rt_mutex *lock,
 	struct rt_mutex_waiter waiter;
 	int ret = 0;
 
-	debug_rt_mutex_init_waiter(&waiter);
-	RB_CLEAR_NODE(&waiter.pi_tree_entry);
-	RB_CLEAR_NODE(&waiter.tree_entry);
+	rt_mutex_init_waiter(&waiter);
 
 	raw_spin_lock(&lock->wait_lock);
 
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -102,6 +102,7 @@ extern struct task_struct *rt_mutex_next
 extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
 				       struct task_struct *proxy_owner);
 extern void rt_mutex_proxy_unlock(struct rt_mutex *lock);
+extern void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
 extern int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 				     struct rt_mutex_waiter *waiter,
 				     struct task_struct *task);



  parent reply	other threads:[~2021-08-08  7:23 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-08  7:22 [PATCH 4.4 00/11] 4.4.280-rc1 review Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 01/11] futex: Rename free_pi_state() to put_pi_state() Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 02/11] futex: Cleanup refcounting Greg Kroah-Hartman
2021-08-08  7:22 ` Greg Kroah-Hartman [this message]
2021-08-08  7:22 ` [PATCH 4.4 04/11] futex: Pull rt_mutex_futex_unlock() out from under hb->lock Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 05/11] futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 06/11] futex: Futex_unlock_pi() determinism Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 07/11] rtmutex: Make wait_lock irq safe Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 08/11] futex: Handle transient "ownerless" rtmutex state correctly Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 09/11] futex: Avoid freeing an active timer Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 10/11] futex,rt_mutex: Fix rt_mutex_cleanup_proxy_lock() Greg Kroah-Hartman
2021-08-08  7:22 ` [PATCH 4.4 11/11] rcu: Update documentation of rcu_read_unlock() Greg Kroah-Hartman
2021-08-08 16:00 ` [PATCH 4.4 00/11] 4.4.280-rc1 review Guenter Roeck
2021-08-10 15:44   ` Greg Kroah-Hartman
2021-08-09 14:14 ` Naresh Kamboju
  -- strict thread matches above, loose matches on Subject: below --
2021-08-02 13:46 [PATCH 4.4 00/11] Fix a potential infinite loop in RT futex-pi scenarios Zhen Lei
2021-08-02 13:46 ` [PATCH 4.4 03/11] futex,rt_mutex: Introduce rt_mutex_init_waiter() Zhen Lei

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210808072217.435137340@linuxfoundation.org \
    --to=gregkh@linuxfoundation.org \
    --cc=bigeasy@linutronix.de \
    --cc=bristot@redhat.com \
    --cc=dvhart@infradead.org \
    --cc=jdesfossez@efficios.com \
    --cc=joe.korty@concurrent-rt.com \
    --cc=juri.lelli@arm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=peterz@infradead.org \
    --cc=rostedt@goodmis.org \
    --cc=stable@vger.kernel.org \
    --cc=tglx@linutronix.de \
    --cc=thunder.leizhen@huawei.com \
    --cc=xlpang@redhat.com \
    --subject='Re: [PATCH 4.4 03/11] futex,rt_mutex: Introduce rt_mutex_init_waiter()' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).