linux-kernel - [ANNOUNCE] 4.14.175-rt81

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Date:   Fri, 17 Apr 2020 14:52:12 -0500
From:   Tom Zanussi <zanussi@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [ANNOUNCE] 4.14.175-rt81

Hello RT Folks!

I'm pleased to announce the 4.14.175-rt81 stable release.

You can get this release via the git tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

  branch: v4.14-rt
  Head SHA1: aad6ed737a078d30926be3205fa67b03018a6ded

Or to build 4.14.175-rt81 directly, the following patches should be applied:

  https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.14.tar.xz

  https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.14.175.xz

  https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/patch-4.14.175-rt81.patch.xz


You can also build from 4.14.175-rt80 by applying the incremental patch:

  https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/incr/patch-4.14.175-rt80-rt81.patch.xz

Enjoy!

   Tom

Changes from v4.14.175-rt80:
---

Steven Rostedt (VMware) (1):
      irq_work: Fix checking of IRQ_WORK_LAZY flag set on non PREEMPT_RT

Tom Zanussi (1):
      Linux 4.14.175-rt81
---
kernel/irq_work.c | 12 +++++++++---
 localversion-rt   |  2 +-
 2 files changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 2899ba0d23d1..838b56cef5fe 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -57,6 +57,12 @@ void __weak arch_irq_work_raise(void)
 	 */
 }
 
+static inline bool use_lazy_list(struct irq_work *work)
+{
+	return (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
+		|| (work->flags & IRQ_WORK_LAZY);
+}
+
 #ifdef CONFIG_SMP
 /*
  * Enqueue the irq_work @work on @cpu unless it's already pending
@@ -78,7 +84,7 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
 	if (!irq_work_claim(work))
 		return false;
 
-	if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
+	if (use_lazy_list(work))
 		list = &per_cpu(lazy_list, cpu);
 	else
 		list = &per_cpu(raised_list, cpu);
@@ -95,7 +101,7 @@ EXPORT_SYMBOL_GPL(irq_work_queue_on);
 bool irq_work_queue(struct irq_work *work)
 {
 	struct llist_head *list;
-	bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
+	bool lazy_work;
 
 	/* Only queue if not already pending */
 	if (!irq_work_claim(work))
@@ -106,7 +112,7 @@ bool irq_work_queue(struct irq_work *work)
 
 	lazy_work = work->flags & IRQ_WORK_LAZY;
 
-	if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ)))
+	if (use_lazy_list(work))
 		list = this_cpu_ptr(&lazy_list);
 	else
 		list = this_cpu_ptr(&raised_list);
diff --git a/localversion-rt b/localversion-rt
index 5ba2c2091cf9..8269ec129c0c 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt80
+-rt81