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Date: Thu, 16 Apr 2020 18:45:10 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [ANNOUNCE] v5.6.4-rt3
Dear RT folks!
I'm pleased to announce the v5.6.4-rt3 patch set.
Changes since v5.6.4-rt2:
- The printk thread could schedule where it is not appropriate.
Affects only PREEMPT_VOLUNTARY. Reported by kernel test robot,
patched by John Ogness.
- The initialization of nohz_full_kick_work triggered a warning.
Reported by kbuild test robot.
- Patch by patch compilation could fail to compile in the fs/proc due
to a missing header file. Reported by kbuild test robot.
- The cached signal struct could lead to a double free of another data
structure. Reported by Daniel Wagner, patch by Matt Fleming.
Known issues
- It has been pointed out that due to changes to the printk code the
internal buffer representation changed. This is only an issue if tools
like `crash' are used to extract the printk buffer from a kernel memory
image.
The delta patch against v5.6.4-rt2 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/incr/patch-5.6.4-rt2-rt3.patch.xz
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.6.4-rt3
The RT patch against v5.6.4 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/older/patch-5.6.4-rt3.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/older/patches-5.6.4-rt3.tar.xz
Sebastian
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8c2a84fc4986d..eb8285ca344f3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -96,6 +96,7 @@
#include <linux/posix-timers.h>
#include <linux/time_namespace.h>
#include <linux/resctrl.h>
+#include <linux/swait.h>
#include <trace/events/oom.h>
#include "internal.h"
#include "fd.h"
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 8821a8c2263ff..8bc683be08574 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2715,6 +2715,7 @@ static int printk_kthread_func(void *data)
&len, printk_time);
console_lock();
+ console_may_schedule = 0;
call_console_drivers(master_seq, ext_text, ext_len, text, len,
msg->level, msg->facility);
if (len > 0 || ext_len > 0)
diff --git a/kernel/signal.c b/kernel/signal.c
index bfa9bcf27d3d7..75c82ecefdbb6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -494,8 +494,8 @@ static void sigqueue_free_current(struct sigqueue *q)
up = q->user;
if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) {
- atomic_dec(&up->sigpending);
- free_uid(up);
+ if (atomic_dec_and_test(&up->sigpending))
+ free_uid(up);
} else
__sigqueue_free(q);
}
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index b568947dc90e5..fc62dcbed7429 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -245,7 +245,7 @@ static void nohz_full_kick_func(struct irq_work *work)
static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
.func = nohz_full_kick_func,
- .flags = IRQ_WORK_HARD_IRQ,
+ .flags = ATOMIC_INIT(IRQ_WORK_HARD_IRQ),
};
/*
diff --git a/localversion-rt b/localversion-rt
index c3054d08a1129..1445cd65885cd 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt2
+-rt3
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