From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Julia Cartwright <julia@ni.com>,
Daniel Wagner <daniel.wagner@siemens.com>,
tom.zanussi@linux.intel.com, Alex Shi <alex.shi@linaro.org>,
stable-rt@vger.kernel.org
Subject: [PATCH RT 12/15] rt/locking: allow recursive local_trylock()
Date: Fri, 01 Dec 2017 19:02:01 -0500 [thread overview]
Message-ID: <20171202000428.546031704@goodmis.org> (raw)
In-Reply-To: 20171202000149.842718953@goodmis.org
[-- Attachment #1: 0012-rt-locking-allow-recursive-local_trylock.patch --]
[-- Type: text/plain, Size: 1275 bytes --]
4.9.65-rt57-rc2 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
required for following networking patch which does recursive try-lock.
While at it, add the !RT version of it because it did not yet exist.
Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/locallock.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/locallock.h b/include/linux/locallock.h
index 845c77f1a5ca..280f884a05a3 100644
--- a/include/linux/locallock.h
+++ b/include/linux/locallock.h
@@ -77,6 +77,9 @@ static inline int __local_trylock(struct local_irq_lock *lv)
lv->owner = current;
lv->nestcnt = 1;
return 1;
+ } else if (lv->owner == current) {
+ lv->nestcnt++;
+ return 1;
}
return 0;
}
@@ -250,6 +253,12 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
static inline void local_irq_lock_init(int lvar) { }
+#define local_trylock(lvar) \
+ ({ \
+ preempt_disable(); \
+ 1; \
+ })
+
#define local_lock(lvar) preempt_disable()
#define local_unlock(lvar) preempt_enable()
#define local_lock_irq(lvar) local_irq_disable()
--
2.13.2
next prev parent reply other threads:[~2017-12-02 0:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-02 0:01 [PATCH RT 00/15] Linux 4.9.65-rt57-rc2 Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 01/15] Revert "memcontrol: Prevent scheduling while atomic in cgroup code" Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 02/15] Revert "fs: jbd2: pull your plug when waiting for space" Steven Rostedt
2017-12-04 8:37 ` Sebastian Andrzej Siewior
2017-12-08 18:13 ` Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 03/15] rtmutex: Fix lock stealing logic Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 04/15] cpu_pm: replace raw_notifier to atomic_notifier Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 05/15] PM / CPU: replace raw_notifier with atomic_notifier (fixup) Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 06/15] kernel/hrtimer: migrate deferred timer on CPU down Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 07/15] net: take the tcp_sk_lock lock with BH disabled Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 08/15] kernel/hrtimer: dont wakeup a process while holding the hrtimer base lock Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 09/15] kernel/hrtimer/hotplug: dont wake ktimersoftd " Steven Rostedt
2017-12-02 0:01 ` [PATCH RT 10/15] Bluetooth: avoid recursive locking in hci_send_to_channel() Steven Rostedt
2017-12-02 0:02 ` [PATCH RT 11/15] iommu/amd: Use raw_cpu_ptr() instead of get_cpu_ptr() for ->flush_queue Steven Rostedt
2017-12-02 0:02 ` Steven Rostedt [this message]
2017-12-02 0:02 ` [PATCH RT 13/15] locking/rtmutex: dont drop the wait_lock twice Steven Rostedt
2017-12-02 0:02 ` [PATCH RT 14/15] net: use trylock in icmp_sk Steven Rostedt
2017-12-02 0:02 ` [PATCH RT 15/15] Linux 4.9.65-rt57-rc2 Steven Rostedt
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