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Date: Tue, 11 Sep 2018 11:29:16 +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] v4.18.7-rt5
Dear RT folks!
I'm pleased to announce the v4.18.7-rt5 patch set.
Changes since v4.18.7-rt4:
- Avoid a memory allocation with disabled interrupts in the "cached
device tree" code
- Avoid queuing a work item with disabled preemption in the "srcu"
code.
- The simple-work queue code used a constant shifted by zero. This is
reported by smack as an error because it should have been a plain
number (in function it is used). Reported by Dan Carpenter.
Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.
The delta patch against v4.18.7-rt4 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.18/incr/patch-4.18.7-rt4-rt5.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 v4.18.7-rt5
The RT patch against v4.18.7 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.18/older/patch-4.18.7-rt5.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.18/older/patches-4.18.7-rt5.tar.xz
Sebastian
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 466e3c8582f0f..7394d9dcc2a1b 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -108,43 +108,49 @@ void of_populate_phandle_cache(void)
u32 cache_entries;
struct device_node *np;
u32 phandles = 0;
+ struct device_node **shadow;
raw_spin_lock_irqsave(&devtree_lock, flags);
-
- kfree(phandle_cache);
+ shadow = phandle_cache;
phandle_cache = NULL;
for_each_of_allnodes(np)
if (np->phandle && np->phandle != OF_PHANDLE_ILLEGAL)
phandles++;
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
cache_entries = roundup_pow_of_two(phandles);
phandle_cache_mask = cache_entries - 1;
- phandle_cache = kcalloc(cache_entries, sizeof(*phandle_cache),
- GFP_ATOMIC);
- if (!phandle_cache)
- goto out;
+ kfree(shadow);
+ shadow = kcalloc(cache_entries, sizeof(*phandle_cache), GFP_KERNEL);
+
+ if (!shadow)
+ return;
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+ phandle_cache = shadow;
for_each_of_allnodes(np)
if (np->phandle && np->phandle != OF_PHANDLE_ILLEGAL)
phandle_cache[np->phandle & phandle_cache_mask] = np;
-out:
raw_spin_unlock_irqrestore(&devtree_lock, flags);
}
int of_free_phandle_cache(void)
{
unsigned long flags;
+ struct device_node **shadow;
raw_spin_lock_irqsave(&devtree_lock, flags);
- kfree(phandle_cache);
+ shadow = phandle_cache;
phandle_cache = NULL;
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ kfree(shadow);
return 0;
}
#if !defined(CONFIG_MODULES)
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 01b6ddeb4f050..a104cf91e6b90 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -479,6 +479,7 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
sync_exp_reset_tree(rsp);
trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("select"));
+ cpus_read_lock();
/* Schedule work for each leaf rcu_node structure. */
rcu_for_each_leaf_node(rsp, rnp) {
rnp->exp_need_flush = false;
@@ -493,13 +494,11 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
continue;
}
INIT_WORK(&rnp->rew.rew_work, sync_rcu_exp_select_node_cpus);
- preempt_disable();
cpu = cpumask_next(rnp->grplo - 1, cpu_online_mask);
/* If all offline, queue the work on an unbound CPU. */
if (unlikely(cpu > rnp->grphi))
cpu = WORK_CPU_UNBOUND;
queue_work_on(cpu, rcu_par_gp_wq, &rnp->rew.rew_work);
- preempt_enable();
rnp->exp_need_flush = true;
}
@@ -507,6 +506,7 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
rcu_for_each_leaf_node(rsp, rnp)
if (rnp->exp_need_flush)
flush_work(&rnp->rew.rew_work);
+ cpus_read_unlock();
}
static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
diff --git a/kernel/sched/swork.c b/kernel/sched/swork.c
index 1950f40ca7258..5559c22f664cf 100644
--- a/kernel/sched/swork.c
+++ b/kernel/sched/swork.c
@@ -12,7 +12,7 @@
#include <linux/spinlock.h>
#include <linux/export.h>
-#define SWORK_EVENT_PENDING (1 << 0)
+#define SWORK_EVENT_PENDING 1
static DEFINE_MUTEX(worker_mutex);
static struct sworker *glob_worker;
diff --git a/localversion-rt b/localversion-rt
index ad3da1bcab7e8..0efe7ba1930e1 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt4
+-rt5
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