lkml.org 
[lkml]   [2020]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[ANNOUNCE] 4.19.115-rt49
From
Date
Hello RT Folks!

I'm pleased to announce the 4.19.115-rt49 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: v4.19-rt
Head SHA1: 7ef3100b1ce706450de2fa2b76003b1e47e12131

Or to build 4.19.115-rt49 directly, the following patches should be applied:

https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.19.tar.xz

https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.19.115.xz

https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/patch-4.19.115-rt49.patch.xz

You can also build from 4.19.115-rt48 by applying the incremental patch:

https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/incr/patch-4.19.115-rt48-rt49.patch.xz

Enjoy!

Tom

Changes from v4.19.115-rt48:
---

Tom Zanussi (1):
Linux 4.19.115-rt49

Zhang Xiao (1):
tasklet: Address a race resulting in double-enqueue
---
include/linux/interrupt.h | 5 ++++-
kernel/softirq.c | 6 +++++-
localversion-rt | 2 +-
3 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 97d9ba26915e..a3b5edb26bc5 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -579,12 +579,15 @@ enum
{
TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */
- TASKLET_STATE_PENDING /* Tasklet is pending */
+ TASKLET_STATE_PENDING, /* Tasklet is pending */
+ TASKLET_STATE_CHAINED /* Tasklet is chained */
};

#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED)
#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN)
#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING)
+#define TASKLET_STATEF_CHAINED (1 << TASKLET_STATE_CHAINED)
+#define TASKLET_STATEF_RC (TASKLET_STATEF_RUN | TASKLET_STATEF_CHAINED)

#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
static inline int tasklet_trylock(struct tasklet_struct *t)
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 25bcf2f2714b..73dae64bfc9c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -947,6 +947,10 @@ static void __tasklet_schedule_common(struct tasklet_struct *t,
* is locked before adding it to the list.
*/
if (test_bit(TASKLET_STATE_SCHED, &t->state)) {
+ if (test_and_set_bit(TASKLET_STATE_CHAINED, &t->state)) {
+ tasklet_unlock(t);
+ return;
+ }
t->next = NULL;
*head->tail = t;
head->tail = &(t->next);
@@ -1040,7 +1044,7 @@ static void tasklet_action_common(struct softirq_action *a,
again:
t->func(t->data);

- while (!tasklet_tryunlock(t)) {
+ while (cmpxchg(&t->state, TASKLET_STATEF_RC, 0) != TASKLET_STATEF_RC) {
/*
* If it got disabled meanwhile, bail out:
*/
diff --git a/localversion-rt b/localversion-rt
index 24707986c321..4b7dca68a5b4 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt48
+-rt49
\
 
 \ /
  Last update: 2020-04-27 21:31    [W:0.047 / U:2.604 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site