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Subject[ANNOUNCE] 4.4.97-rt111

Dear RT Folks,

I'm pleased to announce the 4.4.97-rt111 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: v4.4-rt
Head SHA1: 8a76c8160f17b98621e66686d042afdd7a981ece


Or to build 4.4.97-rt111 directly, the following patches should be applied:

http://www.kernel.org/pub/linux/kernel/v4.x/linux-4.4.tar.xz

http://www.kernel.org/pub/linux/kernel/v4.x/patch-4.4.97.xz

http://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.97-rt111.patch.xz



You can also build from 4.4.97-rt110 by applying the incremental patch:

http://www.kernel.org/pub/linux/kernel/projects/rt/4.4/incr/patch-4.4.97-rt110-rt111.patch.xz



Enjoy,

-- Steve


Changes from v4.4.97-rt110:

---

Peter Zijlstra (1):
sched: Remove TASK_ALL

Sebastian Andrzej Siewior (6):
timer/hrtimer: check properly for a running timer
random: avoid preempt_disable()ed section
sched/migrate disable: handle updated task-mask mg-dis section
kernel/locking: use an exclusive wait_q for sleepers
fs: convert two more BH_Uptodate_Lock related bitspinlocks
md/raid5: do not disable interrupts

Steven Rostedt (VMware) (1):
Linux 4.4.97-rt111

Thomas Gleixner (2):
rtmutex: Make lock_killable work
sched: Prevent task state corruption by spurious lock wakeup

----
drivers/char/random.c | 10 +++---
drivers/md/raid5.c | 4 +--
fs/ext4/page-io.c | 6 ++--
include/linux/hrtimer.h | 8 ++++-
include/linux/sched.h | 19 ++++++++++--
kernel/fork.c | 1 +
kernel/locking/rtmutex.c | 21 +++++--------
kernel/sched/core.c | 81 +++++++++++++++++++++++++++++++++++++++++-------
localversion-rt | 2 +-
9 files changed, 113 insertions(+), 39 deletions(-)
---------------------------
diff --git a/drivers/char/random.c b/drivers/char/random.c
index fecc40a69df8..46c0e27cf27f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -260,6 +260,7 @@
#include <linux/irq.h>
#include <linux/syscalls.h>
#include <linux/completion.h>
+#include <linux/locallock.h>

#include <asm/processor.h>
#include <asm/uaccess.h>
@@ -1796,6 +1797,7 @@ int random_int_secret_init(void)

static DEFINE_PER_CPU(__u32 [MD5_DIGEST_WORDS], get_random_int_hash)
__aligned(sizeof(unsigned long));
+static DEFINE_LOCAL_IRQ_LOCK(hash_entropy_int_lock);

/*
* Get a random word for internal kernel use only. Similar to urandom but
@@ -1811,12 +1813,12 @@ unsigned int get_random_int(void)
if (arch_get_random_int(&ret))
return ret;

- hash = get_cpu_var(get_random_int_hash);
+ hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);

hash[0] += current->pid + jiffies + random_get_entropy();
md5_transform(hash, random_int_secret);
ret = hash[0];
- put_cpu_var(get_random_int_hash);
+ put_locked_var(hash_entropy_int_lock, get_random_int_hash);

return ret;
}
@@ -1833,12 +1835,12 @@ unsigned long get_random_long(void)
if (arch_get_random_long(&ret))
return ret;

- hash = get_cpu_var(get_random_int_hash);
+ hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);

hash[0] += current->pid + jiffies + random_get_entropy();
md5_transform(hash, random_int_secret);
ret = *(unsigned long *)hash;
- put_cpu_var(get_random_int_hash);
+ put_locked_var(hash_entropy_int_lock, get_random_int_hash);

return ret;
}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 9b1aedb8e5df..8b236d622889 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -429,7 +429,7 @@ void raid5_release_stripe(struct stripe_head *sh)
md_wakeup_thread(conf->mddev->thread);
return;
slow_path:
- local_irq_save(flags);
+ local_irq_save_nort(flags);
/* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */
if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) {
INIT_LIST_HEAD(&list);
@@ -438,7 +438,7 @@ slow_path:
spin_unlock(&conf->device_lock);
release_inactive_stripe_list(conf, &list, hash);
}
- local_irq_restore(flags);
+ local_irq_restore_nort(flags);
}

static inline void remove_hash(struct stripe_head *sh)
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 6ca56f5f72b5..9e145fe7cae0 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -97,8 +97,7 @@ static void ext4_finish_bio(struct bio *bio)
* We check all buffers in the page under BH_Uptodate_Lock
* to avoid races with other end io clearing async_write flags
*/
- local_irq_save(flags);
- bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
+ flags = bh_uptodate_lock_irqsave(head);
do {
if (bh_offset(bh) < bio_start ||
bh_offset(bh) + bh->b_size > bio_end) {
@@ -110,8 +109,7 @@ static void ext4_finish_bio(struct bio *bio)
if (bio->bi_error)
buffer_io_error(bh);
} while ((bh = bh->b_this_page) != head);
- bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
- local_irq_restore(flags);
+ bh_uptodate_unlock_irqrestore(head, flags);
if (!under_io) {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (ctx)
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 8fbcdfa5dc77..ff317006d3e8 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -455,7 +455,13 @@ static inline int hrtimer_is_queued(struct hrtimer *timer)
*/
static inline int hrtimer_callback_running(const struct hrtimer *timer)
{
- return timer->base->cpu_base->running == timer;
+ if (timer->base->cpu_base->running == timer)
+ return 1;
+#ifdef CONFIG_PREEMPT_RT_BASE
+ if (timer->base->cpu_base->running_soft == timer)
+ return 1;
+#endif
+ return 0;
}

/* Forward a hrtimer so it expires after now: */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b7b001e26509..f37654adf12a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -234,7 +234,6 @@ extern char ___assert_task_state[1 - 2*!!(

/* Convenience macros for the sake of wake_up */
#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
-#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)

/* get_task_state() */
#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
@@ -980,8 +979,20 @@ struct wake_q_head {
#define WAKE_Q(name) \
struct wake_q_head name = { WAKE_Q_TAIL, &name.first }

-extern void wake_q_add(struct wake_q_head *head,
- struct task_struct *task);
+extern void __wake_q_add(struct wake_q_head *head,
+ struct task_struct *task, bool sleeper);
+static inline void wake_q_add(struct wake_q_head *head,
+ struct task_struct *task)
+{
+ __wake_q_add(head, task, false);
+}
+
+static inline void wake_q_add_sleeper(struct wake_q_head *head,
+ struct task_struct *task)
+{
+ __wake_q_add(head, task, true);
+}
+
extern void __wake_up_q(struct wake_q_head *head, bool sleeper);

static inline void wake_up_q(struct wake_q_head *head)
@@ -1439,6 +1450,7 @@ struct task_struct {
unsigned int policy;
#ifdef CONFIG_PREEMPT_RT_FULL
int migrate_disable;
+ int migrate_disable_update;
# ifdef CONFIG_SCHED_DEBUG
int migrate_disable_atomic;
# endif
@@ -1640,6 +1652,7 @@ struct task_struct {
raw_spinlock_t pi_lock;

struct wake_q_node wake_q;
+ struct wake_q_node wake_q_sleeper;

#ifdef CONFIG_RT_MUTEXES
/* PI waiters blocked on a rt_mutex held by this task */
diff --git a/kernel/fork.c b/kernel/fork.c
index 0a873f52999f..368e770abee6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -395,6 +395,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->splice_pipe = NULL;
tsk->task_frag.page = NULL;
tsk->wake_q.next = NULL;
+ tsk->wake_q_sleeper.next = NULL;

account_kernel_stack(ti, 1);

diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 0e9a6260441d..b5b89c51f27e 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1557,7 +1557,7 @@ static void mark_wakeup_next_waiter(struct wake_q_head *wake_q,
raw_spin_unlock(&current->pi_lock);

if (waiter->savestate)
- wake_q_add(wake_sleeper_q, waiter->task);
+ wake_q_add_sleeper(wake_sleeper_q, waiter->task);
else
wake_q_add(wake_q, waiter->task);
}
@@ -1672,18 +1672,13 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state,
if (try_to_take_rt_mutex(lock, current, waiter))
break;

- /*
- * TASK_INTERRUPTIBLE checks for signals and
- * timeout. Ignored otherwise.
- */
- if (unlikely(state == TASK_INTERRUPTIBLE)) {
- /* Signal pending? */
- if (signal_pending(current))
- ret = -EINTR;
- if (timeout && !timeout->task)
- ret = -ETIMEDOUT;
- if (ret)
- break;
+ if (timeout && !timeout->task) {
+ ret = -ETIMEDOUT;
+ break;
+ }
+ if (signal_pending_state(state, current)) {
+ ret = -EINTR;
+ break;
}

if (ww_ctx && ww_ctx->acquired > 0) {
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ed9550c87f66..ed0f841d4d5c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -523,9 +523,15 @@ static bool set_nr_if_polling(struct task_struct *p)
#endif
#endif

-void wake_q_add(struct wake_q_head *head, struct task_struct *task)
+void __wake_q_add(struct wake_q_head *head, struct task_struct *task,
+ bool sleeper)
{
- struct wake_q_node *node = &task->wake_q;
+ struct wake_q_node *node;
+
+ if (sleeper)
+ node = &task->wake_q_sleeper;
+ else
+ node = &task->wake_q;

/*
* Atomically grab the task, if ->wake_q is !nil already it means
@@ -554,11 +560,17 @@ void __wake_up_q(struct wake_q_head *head, bool sleeper)
while (node != WAKE_Q_TAIL) {
struct task_struct *task;

- task = container_of(node, struct task_struct, wake_q);
+ if (sleeper)
+ task = container_of(node, struct task_struct, wake_q_sleeper);
+ else
+ task = container_of(node, struct task_struct, wake_q);
BUG_ON(!task);
/* task can safely be re-inserted now */
node = node->next;
- task->wake_q.next = NULL;
+ if (sleeper)
+ task->wake_q_sleeper.next = NULL;
+ else
+ task->wake_q.next = NULL;

/*
* wake_up_process() implies a wmb() to pair with the queueing
@@ -1212,18 +1224,14 @@ void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_ma
p->nr_cpus_allowed = cpumask_weight(new_mask);
}

-void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
+static void __do_set_cpus_allowed_tail(struct task_struct *p,
+ const struct cpumask *new_mask)
{
struct rq *rq = task_rq(p);
bool queued, running;

lockdep_assert_held(&p->pi_lock);

- if (__migrate_disabled(p)) {
- cpumask_copy(&p->cpus_allowed, new_mask);
- return;
- }
-
queued = task_on_rq_queued(p);
running = task_current(rq, p);

@@ -1246,6 +1254,20 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
enqueue_task(rq, p, ENQUEUE_RESTORE);
}

+void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
+{
+ if (__migrate_disabled(p)) {
+ lockdep_assert_held(&p->pi_lock);
+
+ cpumask_copy(&p->cpus_allowed, new_mask);
+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
+ p->migrate_disable_update = 1;
+#endif
+ return;
+ }
+ __do_set_cpus_allowed_tail(p, new_mask);
+}
+
static DEFINE_PER_CPU(struct cpumask, sched_cpumasks);
static DEFINE_MUTEX(sched_down_mutex);
static cpumask_t sched_down_cpumask;
@@ -2212,7 +2234,7 @@ EXPORT_SYMBOL(wake_up_process);
*/
int wake_up_lock_sleeper(struct task_struct *p)
{
- return try_to_wake_up(p, TASK_ALL, WF_LOCK_SLEEPER);
+ return try_to_wake_up(p, TASK_UNINTERRUPTIBLE, WF_LOCK_SLEEPER);
}

int wake_up_state(struct task_struct *p, unsigned int state)
@@ -3231,6 +3253,43 @@ void migrate_enable(void)
*/
p->migrate_disable = 0;

+ if (p->migrate_disable_update) {
+ unsigned long flags;
+ struct rq *rq;
+
+ rq = task_rq_lock(p, &flags);
+ update_rq_clock(rq);
+
+ __do_set_cpus_allowed_tail(p, &p->cpus_allowed);
+ task_rq_unlock(rq, p, &flags);
+
+ p->migrate_disable_update = 0;
+
+ WARN_ON(smp_processor_id() != task_cpu(p));
+ if (!cpumask_test_cpu(task_cpu(p), &p->cpus_allowed)) {
+ const struct cpumask *cpu_valid_mask = cpu_active_mask;
+ struct migration_arg arg;
+ unsigned int dest_cpu;
+
+ if (p->flags & PF_KTHREAD) {
+ /*
+ * Kernel threads are allowed on online && !active CPUs
+ */
+ cpu_valid_mask = cpu_online_mask;
+ }
+ dest_cpu = cpumask_any_and(cpu_valid_mask, &p->cpus_allowed);
+ arg.task = p;
+ arg.dest_cpu = dest_cpu;
+
+ unpin_current_cpu();
+ preempt_lazy_enable();
+ preempt_enable();
+ stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
+ tlb_migrate_finish(p->mm);
+ return;
+ }
+ }
+
unpin_current_cpu();
preempt_enable();
preempt_lazy_enable();
diff --git a/localversion-rt b/localversion-rt
index b3e668a8fb94..9969a4b69fad 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt110
+-rt111
\
 
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