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Diffstat (limited to 'kernel')
-rw-r--r--kernel/cpu.c24
-rw-r--r--kernel/fork.c4
-rw-r--r--kernel/irq/chip.c33
-rw-r--r--kernel/lockdep.c18
-rw-r--r--kernel/mutex-debug.c2
-rw-r--r--kernel/posix-cpu-timers.c27
-rw-r--r--kernel/power/swap.c3
-rw-r--r--kernel/time/jiffies.c2
8 files changed, 62 insertions, 51 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 32c96628463..27dd3ee4709 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -19,7 +19,7 @@
static DEFINE_MUTEX(cpu_add_remove_lock);
static DEFINE_MUTEX(cpu_bitmask_lock);
-static __cpuinitdata BLOCKING_NOTIFIER_HEAD(cpu_chain);
+static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain);
/* If set, cpu_up and cpu_down will return -EBUSY and do nothing.
* Should always be manipulated under cpu_add_remove_lock
@@ -68,7 +68,11 @@ EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);
/* Need to know about CPUs going up/down? */
int __cpuinit register_cpu_notifier(struct notifier_block *nb)
{
- return blocking_notifier_chain_register(&cpu_chain, nb);
+ int ret;
+ mutex_lock(&cpu_add_remove_lock);
+ ret = raw_notifier_chain_register(&cpu_chain, nb);
+ mutex_unlock(&cpu_add_remove_lock);
+ return ret;
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -77,7 +81,9 @@ EXPORT_SYMBOL(register_cpu_notifier);
void unregister_cpu_notifier(struct notifier_block *nb)
{
- blocking_notifier_chain_unregister(&cpu_chain, nb);
+ mutex_lock(&cpu_add_remove_lock);
+ raw_notifier_chain_unregister(&cpu_chain, nb);
+ mutex_unlock(&cpu_add_remove_lock);
}
EXPORT_SYMBOL(unregister_cpu_notifier);
@@ -126,7 +132,7 @@ static int _cpu_down(unsigned int cpu)
if (!cpu_online(cpu))
return -EINVAL;
- err = blocking_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE,
+ err = raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE,
(void *)(long)cpu);
if (err == NOTIFY_BAD) {
printk("%s: attempt to take down CPU %u failed\n",
@@ -146,7 +152,7 @@ static int _cpu_down(unsigned int cpu)
if (IS_ERR(p)) {
/* CPU didn't die: tell everyone. Can't complain. */
- if (blocking_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED,
+ if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED,
(void *)(long)cpu) == NOTIFY_BAD)
BUG();
@@ -169,7 +175,7 @@ static int _cpu_down(unsigned int cpu)
put_cpu();
/* CPU is completely dead: tell everyone. Too late to complain. */
- if (blocking_notifier_call_chain(&cpu_chain, CPU_DEAD,
+ if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD,
(void *)(long)cpu) == NOTIFY_BAD)
BUG();
@@ -206,7 +212,7 @@ static int __devinit _cpu_up(unsigned int cpu)
if (cpu_online(cpu) || !cpu_present(cpu))
return -EINVAL;
- ret = blocking_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE, hcpu);
+ ret = raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE, hcpu);
if (ret == NOTIFY_BAD) {
printk("%s: attempt to bring up CPU %u failed\n",
__FUNCTION__, cpu);
@@ -223,11 +229,11 @@ static int __devinit _cpu_up(unsigned int cpu)
BUG_ON(!cpu_online(cpu));
/* Now call notifier in preparation. */
- blocking_notifier_call_chain(&cpu_chain, CPU_ONLINE, hcpu);
+ raw_notifier_call_chain(&cpu_chain, CPU_ONLINE, hcpu);
out_notify:
if (ret != 0)
- blocking_notifier_call_chain(&cpu_chain,
+ raw_notifier_call_chain(&cpu_chain,
CPU_UP_CANCELED, hcpu);
return ret;
diff --git a/kernel/fork.c b/kernel/fork.c
index 7dc6140baac..29ebb30850e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -984,6 +984,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (!p)
goto fork_out;
+ rt_mutex_init_task(p);
+
#ifdef CONFIG_TRACE_IRQFLAGS
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
@@ -1088,8 +1090,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->lockdep_recursion = 0;
#endif
- rt_mutex_init_task(p);
-
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 11c99697acf..2d0dc3efe81 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -499,7 +499,8 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
#endif /* CONFIG_SMP */
void
-__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained)
+__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
+ const char *name)
{
struct irq_desc *desc;
unsigned long flags;
@@ -540,6 +541,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained)
desc->depth = 1;
}
desc->handle_irq = handle;
+ desc->name = name;
if (handle != handle_bad_irq && is_chained) {
desc->status &= ~IRQ_DISABLED;
@@ -555,30 +557,13 @@ set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
irq_flow_handler_t handle)
{
set_irq_chip(irq, chip);
- __set_irq_handler(irq, handle, 0);
+ __set_irq_handler(irq, handle, 0, NULL);
}
-/*
- * Get a descriptive string for the highlevel handler, for
- * /proc/interrupts output:
- */
-const char *
-handle_irq_name(irq_flow_handler_t handle)
+void
+set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
+ irq_flow_handler_t handle, const char *name)
{
- if (handle == handle_level_irq)
- return "level ";
- if (handle == handle_fasteoi_irq)
- return "fasteoi";
- if (handle == handle_edge_irq)
- return "edge ";
- if (handle == handle_simple_irq)
- return "simple ";
-#ifdef CONFIG_SMP
- if (handle == handle_percpu_irq)
- return "percpu ";
-#endif
- if (handle == handle_bad_irq)
- return "bad ";
-
- return NULL;
+ set_irq_chip(irq, chip);
+ __set_irq_handler(irq, handle, 0, name);
}
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 805a322a565..b739be2a6dc 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -575,6 +575,8 @@ static noinline int print_circular_bug_tail(void)
return 0;
}
+#define RECURSION_LIMIT 40
+
static int noinline print_infinite_recursion_bug(void)
{
__raw_spin_unlock(&hash_lock);
@@ -595,7 +597,7 @@ check_noncircular(struct lock_class *source, unsigned int depth)
debug_atomic_inc(&nr_cyclic_check_recursions);
if (depth > max_recursion_depth)
max_recursion_depth = depth;
- if (depth >= 20)
+ if (depth >= RECURSION_LIMIT)
return print_infinite_recursion_bug();
/*
* Check this lock's dependency list:
@@ -645,7 +647,7 @@ find_usage_forwards(struct lock_class *source, unsigned int depth)
if (depth > max_recursion_depth)
max_recursion_depth = depth;
- if (depth >= 20)
+ if (depth >= RECURSION_LIMIT)
return print_infinite_recursion_bug();
debug_atomic_inc(&nr_find_usage_forwards_checks);
@@ -684,7 +686,7 @@ find_usage_backwards(struct lock_class *source, unsigned int depth)
if (depth > max_recursion_depth)
max_recursion_depth = depth;
- if (depth >= 20)
+ if (depth >= RECURSION_LIMIT)
return print_infinite_recursion_bug();
debug_atomic_inc(&nr_find_usage_backwards_checks);
@@ -1174,7 +1176,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
* itself, so actual lookup of the hash should be once per lock object.
*/
static inline struct lock_class *
-register_lock_class(struct lockdep_map *lock, unsigned int subclass)
+register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
{
struct lockdep_subclass_key *key;
struct list_head *hash_head;
@@ -1246,7 +1248,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass)
out_unlock_set:
__raw_spin_unlock(&hash_lock);
- if (!subclass)
+ if (!subclass || force)
lock->class_cache = class;
DEBUG_LOCKS_WARN_ON(class->subclass != subclass);
@@ -1934,7 +1936,7 @@ void trace_softirqs_off(unsigned long ip)
* Initialize a lock instance's lock-class mapping info:
*/
void lockdep_init_map(struct lockdep_map *lock, const char *name,
- struct lock_class_key *key)
+ struct lock_class_key *key, int subclass)
{
if (unlikely(!debug_locks))
return;
@@ -1954,6 +1956,8 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
lock->name = name;
lock->key = key;
lock->class_cache = NULL;
+ if (subclass)
+ register_lock_class(lock, subclass, 1);
}
EXPORT_SYMBOL_GPL(lockdep_init_map);
@@ -1992,7 +1996,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
* Not cached yet or subclass?
*/
if (unlikely(!class)) {
- class = register_lock_class(lock, subclass);
+ class = register_lock_class(lock, subclass, 0);
if (!class)
return 0;
}
diff --git a/kernel/mutex-debug.c b/kernel/mutex-debug.c
index e3203c654dd..18651641a7b 100644
--- a/kernel/mutex-debug.c
+++ b/kernel/mutex-debug.c
@@ -91,7 +91,7 @@ void debug_mutex_init(struct mutex *lock, const char *name,
* Make sure we are not reinitializing a held lock:
*/
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
- lockdep_init_map(&lock->dep_map, name, key);
+ lockdep_init_map(&lock->dep_map, name, key, 0);
#endif
lock->owner = NULL;
lock->magic = lock;
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 479b16b44f7..7c3e1e6dfb5 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -88,6 +88,19 @@ static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock,
}
/*
+ * Divide and limit the result to res >= 1
+ *
+ * This is necessary to prevent signal delivery starvation, when the result of
+ * the division would be rounded down to 0.
+ */
+static inline cputime_t cputime_div_non_zero(cputime_t time, unsigned long div)
+{
+ cputime_t res = cputime_div(time, div);
+
+ return max_t(cputime_t, res, 1);
+}
+
+/*
* Update expiry time from increment, and increase overrun count,
* given the current clock sample.
*/
@@ -483,8 +496,8 @@ static void process_timer_rebalance(struct task_struct *p,
BUG();
break;
case CPUCLOCK_PROF:
- left = cputime_div(cputime_sub(expires.cpu, val.cpu),
- nthreads);
+ left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
+ nthreads);
do {
if (likely(!(t->flags & PF_EXITING))) {
ticks = cputime_add(prof_ticks(t), left);
@@ -498,8 +511,8 @@ static void process_timer_rebalance(struct task_struct *p,
} while (t != p);
break;
case CPUCLOCK_VIRT:
- left = cputime_div(cputime_sub(expires.cpu, val.cpu),
- nthreads);
+ left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
+ nthreads);
do {
if (likely(!(t->flags & PF_EXITING))) {
ticks = cputime_add(virt_ticks(t), left);
@@ -515,6 +528,7 @@ static void process_timer_rebalance(struct task_struct *p,
case CPUCLOCK_SCHED:
nsleft = expires.sched - val.sched;
do_div(nsleft, nthreads);
+ nsleft = max_t(unsigned long long, nsleft, 1);
do {
if (likely(!(t->flags & PF_EXITING))) {
ns = t->sched_time + nsleft;
@@ -1159,12 +1173,13 @@ static void check_process_timers(struct task_struct *tsk,
prof_left = cputime_sub(prof_expires, utime);
prof_left = cputime_sub(prof_left, stime);
- prof_left = cputime_div(prof_left, nthreads);
+ prof_left = cputime_div_non_zero(prof_left, nthreads);
virt_left = cputime_sub(virt_expires, utime);
- virt_left = cputime_div(virt_left, nthreads);
+ virt_left = cputime_div_non_zero(virt_left, nthreads);
if (sched_expires) {
sched_left = sched_expires - sched_time;
do_div(sched_left, nthreads);
+ sched_left = max_t(unsigned long long, sched_left, 1);
} else {
sched_left = 0;
}
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 9b2ee5344de..1a3b0dd2c3f 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -425,7 +425,8 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
bio_set_pages_dirty(bio);
bio_put(bio);
} else {
- get_page(page);
+ if (rw == READ)
+ get_page(page); /* These pages are freed later */
bio->bi_private = *bio_chain;
*bio_chain = bio;
submit_bio(rw | (1 << BIO_RW_SYNC), bio);
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 126bb30c4af..a99b2a6e6a0 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -57,7 +57,7 @@ static cycle_t jiffies_read(void)
struct clocksource clocksource_jiffies = {
.name = "jiffies",
- .rating = 0, /* lowest rating*/
+ .rating = 1, /* lowest valid rating*/
.read = jiffies_read,
.mask = 0xffffffff, /*32bits*/
.mult = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-30 06:13:38 +0000