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Subject[ANNOUNCE] 4.19.127-rt55
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Date
Hello RT Folks!

I'm pleased to announce the 4.19.127-rt55 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: f297d3d16170bd3af56f7310963c727ce2cab5c7

Or to build 4.19.127-rt55 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-4.19.127.xz

https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/patch-4.19.127-rt55.patch.xz


You can also build from 4.19.127-rt54 by applying the incremental patch:

https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/incr/patch-4.19.127-rt54-rt55.patch.xz

Enjoy!

Tom

Changes from v4.19.127-rt54:
---

Kevin Hao (1):
mm: slub: Always flush the delayed empty slubs in flush_all()

Sebastian Andrzej Siewior (1):
fs/dcache: Include swait.h header

Tom Zanussi (2):
tasklet: Fix UP case for tasklet CHAINED state
Linux 4.19.127-rt55
---
fs/proc/base.c | 1 +
kernel/softirq.c | 6 ++++++
localversion-rt | 2 +-
mm/slub.c | 3 ---
4 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/fs/proc/base.c b/fs/proc/base.c
index a45d4d640f01..56b1c4f1e8c0 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -95,6 +95,7 @@
#include <linux/flex_array.h>
#include <linux/posix-timers.h>
#include <trace/events/oom.h>
+#include <linux/swait.h>
#include "internal.h"
#include "fd.h"

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 73dae64bfc9c..9bad7a16dc61 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -947,10 +947,12 @@ 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 defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
if (test_and_set_bit(TASKLET_STATE_CHAINED, &t->state)) {
tasklet_unlock(t);
return;
}
+#endif
t->next = NULL;
*head->tail = t;
head->tail = &(t->next);
@@ -1044,7 +1046,11 @@ static void tasklet_action_common(struct softirq_action *a,
again:
t->func(t->data);

+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
while (cmpxchg(&t->state, TASKLET_STATEF_RC, 0) != TASKLET_STATEF_RC) {
+#else
+ while (!tasklet_tryunlock(t)) {
+#endif
/*
* If it got disabled meanwhile, bail out:
*/
diff --git a/localversion-rt b/localversion-rt
index 3165a8781ff5..51b05e9abe6f 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt54
+-rt55
diff --git a/mm/slub.c b/mm/slub.c
index d243c6ef7fc9..a9473bbb1338 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2341,9 +2341,6 @@ static void flush_all(struct kmem_cache *s)
for_each_online_cpu(cpu) {
struct slub_free_list *f;

- if (!has_cpu_slab(cpu, s))
- continue;
-
f = &per_cpu(slub_free_list, cpu);
raw_spin_lock_irq(&f->lock);
list_splice_init(&f->list, &tofree);
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