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-rw-r--r--kernel/Makefile2
-rw-r--r--kernel/cgroup.c54
-rw-r--r--kernel/exit.c2
-rw-r--r--kernel/fork.c9
-rw-r--r--kernel/freezer.c9
-rw-r--r--kernel/hrtimer.c2
-rw-r--r--kernel/irq/manage.c2
-rw-r--r--kernel/irq_work.c18
-rw-r--r--kernel/kprobes.c8
-rw-r--r--kernel/kthread.c2
-rw-r--r--kernel/power/Makefile5
-rw-r--r--kernel/power/hibernate.c7
-rw-r--r--kernel/power/process.c8
-rw-r--r--kernel/power/suspend.c2
-rw-r--r--kernel/printk.c22
-rw-r--r--kernel/rcutree.c4
-rw-r--r--kernel/sched.c45
-rw-r--r--kernel/sched_autogroup.c8
-rw-r--r--kernel/softirq.c44
-rw-r--r--kernel/taskstats.c5
-rw-r--r--kernel/time/clocksource.c1
-rw-r--r--kernel/time/tick-common.c2
-rw-r--r--kernel/time/tick-oneshot.c4
-rw-r--r--kernel/trace/trace_selftest.c2
-rw-r--r--kernel/watchdog.c36
-rw-r--r--kernel/workqueue.c60
26 files changed, 227 insertions, 136 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index e0f2831..5669f71 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -122,7 +122,7 @@ $(obj)/configs.o: $(obj)/config_data.h
# config_data.h contains the same information as ikconfig.h but gzipped.
# Info from config_data can be extracted from /proc/config*
targets += config_data.gz
-$(obj)/config_data.gz: .config FORCE
+$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
$(call if_changed,gzip)
quiet_cmd_ikconfiggz = IKCFG $@
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 66a416b..51cddc1 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -763,6 +763,8 @@ EXPORT_SYMBOL_GPL(cgroup_unlock);
* -> cgroup_mkdir.
*/
+static struct dentry *cgroup_lookup(struct inode *dir,
+ struct dentry *dentry, struct nameidata *nd);
static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, int mode);
static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry);
static int cgroup_populate_dir(struct cgroup *cgrp);
@@ -874,25 +876,29 @@ static void cgroup_clear_directory(struct dentry *dentry)
struct list_head *node;
BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
- spin_lock(&dcache_lock);
+ spin_lock(&dentry->d_lock);
node = dentry->d_subdirs.next;
while (node != &dentry->d_subdirs) {
struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
+
+ spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
list_del_init(node);
if (d->d_inode) {
/* This should never be called on a cgroup
* directory with child cgroups */
BUG_ON(d->d_inode->i_mode & S_IFDIR);
- d = dget_locked(d);
- spin_unlock(&dcache_lock);
+ dget_dlock(d);
+ spin_unlock(&d->d_lock);
+ spin_unlock(&dentry->d_lock);
d_delete(d);
simple_unlink(dentry->d_inode, d);
dput(d);
- spin_lock(&dcache_lock);
- }
+ spin_lock(&dentry->d_lock);
+ } else
+ spin_unlock(&d->d_lock);
node = dentry->d_subdirs.next;
}
- spin_unlock(&dcache_lock);
+ spin_unlock(&dentry->d_lock);
}
/*
@@ -900,11 +906,16 @@ static void cgroup_clear_directory(struct dentry *dentry)
*/
static void cgroup_d_remove_dir(struct dentry *dentry)
{
+ struct dentry *parent;
+
cgroup_clear_directory(dentry);
- spin_lock(&dcache_lock);
+ parent = dentry->d_parent;
+ spin_lock(&parent->d_lock);
+ spin_lock(&dentry->d_lock);
list_del_init(&dentry->d_u.d_child);
- spin_unlock(&dcache_lock);
+ spin_unlock(&dentry->d_lock);
+ spin_unlock(&parent->d_lock);
remove_dir(dentry);
}
@@ -2180,7 +2191,7 @@ static const struct file_operations cgroup_file_operations = {
};
static const struct inode_operations cgroup_dir_inode_operations = {
- .lookup = simple_lookup,
+ .lookup = cgroup_lookup,
.mkdir = cgroup_mkdir,
.rmdir = cgroup_rmdir,
.rename = cgroup_rename,
@@ -2196,13 +2207,29 @@ static inline struct cftype *__file_cft(struct file *file)
return __d_cft(file->f_dentry);
}
-static int cgroup_create_file(struct dentry *dentry, mode_t mode,
- struct super_block *sb)
+static int cgroup_delete_dentry(const struct dentry *dentry)
+{
+ return 1;
+}
+
+static struct dentry *cgroup_lookup(struct inode *dir,
+ struct dentry *dentry, struct nameidata *nd)
{
- static const struct dentry_operations cgroup_dops = {
+ static const struct dentry_operations cgroup_dentry_operations = {
+ .d_delete = cgroup_delete_dentry,
.d_iput = cgroup_diput,
};
+ if (dentry->d_name.len > NAME_MAX)
+ return ERR_PTR(-ENAMETOOLONG);
+ d_set_d_op(dentry, &cgroup_dentry_operations);
+ d_add(dentry, NULL);
+ return NULL;
+}
+
+static int cgroup_create_file(struct dentry *dentry, mode_t mode,
+ struct super_block *sb)
+{
struct inode *inode;
if (!dentry)
@@ -2228,7 +2255,6 @@ static int cgroup_create_file(struct dentry *dentry, mode_t mode,
inode->i_size = 0;
inode->i_fop = &cgroup_file_operations;
}
- dentry->d_op = &cgroup_dops;
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
return 0;
@@ -3638,9 +3664,7 @@ again:
list_del(&cgrp->sibling);
cgroup_unlock_hierarchy(cgrp->root);
- spin_lock(&cgrp->dentry->d_lock);
d = dget(cgrp->dentry);
- spin_unlock(&d->d_lock);
cgroup_d_remove_dir(d);
dput(d);
diff --git a/kernel/exit.c b/kernel/exit.c
index 8cb8904..f9a45eb 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -69,7 +69,7 @@ static void __unhash_process(struct task_struct *p, bool group_dead)
list_del_rcu(&p->tasks);
list_del_init(&p->sibling);
- __get_cpu_var(process_counts)--;
+ __this_cpu_dec(process_counts);
}
list_del_rcu(&p->thread_group);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 7d164e2..d9b44f2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -169,15 +169,14 @@ EXPORT_SYMBOL(free_task);
static inline void free_signal_struct(struct signal_struct *sig)
{
taskstats_tgid_free(sig);
+ sched_autogroup_exit(sig);
kmem_cache_free(signal_cachep, sig);
}
static inline void put_signal_struct(struct signal_struct *sig)
{
- if (atomic_dec_and_test(&sig->sigcnt)) {
- sched_autogroup_exit(sig);
+ if (atomic_dec_and_test(&sig->sigcnt))
free_signal_struct(sig);
- }
}
void __put_task_struct(struct task_struct *tsk)
@@ -1286,7 +1285,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
attach_pid(p, PIDTYPE_SID, task_session(current));
list_add_tail(&p->sibling, &p->real_parent->children);
list_add_tail_rcu(&p->tasks, &init_task.tasks);
- __get_cpu_var(process_counts)++;
+ __this_cpu_inc(process_counts);
}
attach_pid(p, PIDTYPE_PID, pid);
nr_threads++;
@@ -1318,7 +1317,7 @@ bad_fork_cleanup_mm:
}
bad_fork_cleanup_signal:
if (!(clone_flags & CLONE_THREAD))
- put_signal_struct(p->signal);
+ free_signal_struct(p->signal);
bad_fork_cleanup_sighand:
__cleanup_sighand(p->sighand);
bad_fork_cleanup_fs:
diff --git a/kernel/freezer.c b/kernel/freezer.c
index bd1d42b..66ecd2e 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -104,8 +104,13 @@ bool freeze_task(struct task_struct *p, bool sig_only)
}
if (should_send_signal(p)) {
- if (!signal_pending(p))
- fake_signal_wake_up(p);
+ fake_signal_wake_up(p);
+ /*
+ * fake_signal_wake_up() goes through p's scheduler
+ * lock and guarantees that TASK_STOPPED/TRACED ->
+ * TASK_RUNNING transition can't race with task state
+ * testing in try_to_freeze_tasks().
+ */
} else if (sig_only) {
return false;
} else {
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f2429fc..45da2b6 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -497,7 +497,7 @@ static inline int hrtimer_is_hres_enabled(void)
*/
static inline int hrtimer_hres_active(void)
{
- return __get_cpu_var(hrtimer_bases).hres_active;
+ return __this_cpu_read(hrtimer_bases.hres_active);
}
/*
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 91a5fa2..0caa59f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -577,7 +577,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { }
*/
static int irq_thread(void *data)
{
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_USER_RT_PRIO/2,
};
struct irqaction *action = data;
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 90f8819..c58fa7d 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -77,21 +77,21 @@ void __weak arch_irq_work_raise(void)
*/
static void __irq_work_queue(struct irq_work *entry)
{
- struct irq_work **head, *next;
+ struct irq_work *next;
- head = &get_cpu_var(irq_work_list);
+ preempt_disable();
do {
- next = *head;
+ next = __this_cpu_read(irq_work_list);
/* Can assign non-atomic because we keep the flags set. */
entry->next = next_flags(next, IRQ_WORK_FLAGS);
- } while (cmpxchg(head, next, entry) != next);
+ } while (this_cpu_cmpxchg(irq_work_list, next, entry) != next);
/* The list was empty, raise self-interrupt to start processing. */
if (!irq_work_next(entry))
arch_irq_work_raise();
- put_cpu_var(irq_work_list);
+ preempt_enable();
}
/*
@@ -120,16 +120,16 @@ EXPORT_SYMBOL_GPL(irq_work_queue);
*/
void irq_work_run(void)
{
- struct irq_work *list, **head;
+ struct irq_work *list;
- head = &__get_cpu_var(irq_work_list);
- if (*head == NULL)
+ if (this_cpu_read(irq_work_list) == NULL)
return;
BUG_ON(!in_irq());
BUG_ON(!irqs_disabled());
- list = xchg(head, NULL);
+ list = this_cpu_xchg(irq_work_list, NULL);
+
while (list != NULL) {
struct irq_work *entry = list;
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7663e5d..7798181 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -317,12 +317,12 @@ void __kprobes free_optinsn_slot(kprobe_opcode_t * slot, int dirty)
/* We have preemption disabled.. so it is safe to use __ versions */
static inline void set_kprobe_instance(struct kprobe *kp)
{
- __get_cpu_var(kprobe_instance) = kp;
+ __this_cpu_write(kprobe_instance, kp);
}
static inline void reset_kprobe_instance(void)
{
- __get_cpu_var(kprobe_instance) = NULL;
+ __this_cpu_write(kprobe_instance, NULL);
}
/*
@@ -965,7 +965,7 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
int trapnr)
{
- struct kprobe *cur = __get_cpu_var(kprobe_instance);
+ struct kprobe *cur = __this_cpu_read(kprobe_instance);
/*
* if we faulted "during" the execution of a user specified
@@ -980,7 +980,7 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
{
- struct kprobe *cur = __get_cpu_var(kprobe_instance);
+ struct kprobe *cur = __this_cpu_read(kprobe_instance);
int ret = 0;
if (cur && cur->break_handler) {
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5355cfd..c55afba 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -148,7 +148,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
wait_for_completion(&create.done);
if (!IS_ERR(create.result)) {
- static struct sched_param param = { .sched_priority = 0 };
+ static const struct sched_param param = { .sched_priority = 0 };
va_list args;
va_start(args, namefmt);
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index f9063c6..b755972 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,7 +1,4 @@
-
-ifeq ($(CONFIG_PM_DEBUG),y)
-EXTRA_CFLAGS += -DDEBUG
-endif
+ccflags-$(CONFIG_PM_DEBUG) := -DDEBUG
obj-$(CONFIG_PM) += main.o
obj-$(CONFIG_PM_SLEEP) += console.o
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 048d0b5..870f72b 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -62,7 +62,7 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
{
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
&& ops->prepare && ops->finish && ops->enter && ops->pre_restore
- && ops->restore_cleanup)) {
+ && ops->restore_cleanup && ops->leave)) {
WARN_ON(1);
return;
}
@@ -278,7 +278,7 @@ static int create_image(int platform_mode)
goto Enable_irqs;
}
- if (hibernation_test(TEST_CORE) || !pm_check_wakeup_events())
+ if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
goto Power_up;
in_suspend = 1;
@@ -516,7 +516,7 @@ int hibernation_platform_enter(void)
local_irq_disable();
sysdev_suspend(PMSG_HIBERNATE);
- if (!pm_check_wakeup_events()) {
+ if (pm_wakeup_pending()) {
error = -EAGAIN;
goto Power_up;
}
@@ -647,6 +647,7 @@ int hibernate(void)
swsusp_free();
if (!error)
power_down();
+ in_suspend = 0;
pm_restore_gfp_mask();
} else {
pr_debug("PM: Image restored successfully.\n");
diff --git a/kernel/power/process.c b/kernel/power/process.c
index e50b4c1..d6d2a10 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -64,6 +64,12 @@ static int try_to_freeze_tasks(bool sig_only)
* perturb a task in TASK_STOPPED or TASK_TRACED.
* It is "frozen enough". If the task does wake
* up, it will immediately call try_to_freeze.
+ *
+ * Because freeze_task() goes through p's
+ * scheduler lock after setting TIF_FREEZE, it's
+ * guaranteed that either we see TASK_RUNNING or
+ * try_to_stop() after schedule() in ptrace/signal
+ * stop sees TIF_FREEZE.
*/
if (!task_is_stopped_or_traced(p) &&
!freezer_should_skip(p))
@@ -79,7 +85,7 @@ static int try_to_freeze_tasks(bool sig_only)
if (!todo || time_after(jiffies, end_time))
break;
- if (!pm_check_wakeup_events()) {
+ if (pm_wakeup_pending()) {
wakeup = true;
break;
}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 031d5e3..8850df6 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -164,7 +164,7 @@ static int suspend_enter(suspend_state_t state)
error = sysdev_suspend(PMSG_SUSPEND);
if (!error) {
- if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
+ if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
error = suspend_ops->enter(state);
events_check_enabled = false;
}
diff --git a/kernel/printk.c b/kernel/printk.c
index ab3ffc5..f64b899 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -43,12 +43,6 @@
#include <asm/uaccess.h>
/*
- * for_each_console() allows you to iterate on each console
- */
-#define for_each_console(con) \
- for (con = console_drivers; con != NULL; con = con->next)
-
-/*
* Architectures can override it:
*/
void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
@@ -279,12 +273,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
* at open time.
*/
if (type == SYSLOG_ACTION_OPEN || !from_file) {
- if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
- return -EPERM;
+ if (dmesg_restrict && !capable(CAP_SYSLOG))
+ goto warn; /* switch to return -EPERM after 2.6.39 */
if ((type != SYSLOG_ACTION_READ_ALL &&
type != SYSLOG_ACTION_SIZE_BUFFER) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
+ !capable(CAP_SYSLOG))
+ goto warn; /* switch to return -EPERM after 2.6.39 */
}
error = security_syslog(type);
@@ -428,6 +422,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
}
out:
return error;
+warn:
+ /* remove after 2.6.39 */
+ if (capable(CAP_SYS_ADMIN))
+ WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
+ "but no CAP_SYSLOG (deprecated and denied).\n");
+ return -EPERM;
}
SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
@@ -1359,6 +1359,7 @@ void register_console(struct console *newcon)
spin_unlock_irqrestore(&logbuf_lock, flags);
}
release_console_sem();
+ console_sysfs_notify();
/*
* By unregistering the bootconsoles after we enable the real console
@@ -1417,6 +1418,7 @@ int unregister_console(struct console *console)
console_drivers->flags |= CON_CONSDEV;
release_console_sem();
+ console_sysfs_notify();
return res;
}
EXPORT_SYMBOL(unregister_console);
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d0ddfea..dd4aea8 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -364,8 +364,8 @@ void rcu_irq_exit(void)
WARN_ON_ONCE(rdtp->dynticks & 0x1);
/* If the interrupt queued a callback, get out of dyntick mode. */
- if (__get_cpu_var(rcu_sched_data).nxtlist ||
- __get_cpu_var(rcu_bh_data).nxtlist)
+ if (__this_cpu_read(rcu_sched_data.nxtlist) ||
+ __this_cpu_read(rcu_bh_data.nxtlist))
set_need_resched();
}
diff --git a/kernel/sched.c b/kernel/sched.c
index 0494908..a0eb094 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -278,14 +278,12 @@ struct task_group {
#endif
};
-#define root_task_group init_task_group
-
/* task_group_lock serializes the addition/removal of task groups */
static DEFINE_SPINLOCK(task_group_lock);
#ifdef CONFIG_FAIR_GROUP_SCHED
-# define INIT_TASK_GROUP_LOAD NICE_0_LOAD
+# define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
/*
* A weight of 0 or 1 can cause arithmetics problems.
@@ -298,13 +296,13 @@ static DEFINE_SPINLOCK(task_group_lock);
#define MIN_SHARES 2
#define MAX_SHARES (1UL << 18)
-static int init_task_group_load = INIT_TASK_GROUP_LOAD;
+static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
#endif
/* Default task group.
* Every task in system belong to this group at bootup.
*/
-struct task_group init_task_group;
+struct task_group root_task_group;
#endif /* CONFIG_CGROUP_SCHED */
@@ -743,7 +741,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
buf[cnt] = 0;
cmp = strstrip(buf);
- if (strncmp(buf, "NO_", 3) == 0) {
+ if (strncmp(cmp, "NO_", 3) == 0) {
neg = 1;
cmp += 3;
}
@@ -7848,7 +7846,7 @@ static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
cfs_rq->tg = tg;
tg->se[cpu] = se;
- /* se could be NULL for init_task_group */
+ /* se could be NULL for root_task_group */
if (!se)
return;
@@ -7908,18 +7906,18 @@ void __init sched_init(void)
ptr = (unsigned long)kzalloc(alloc_size, GFP_NOWAIT);
#ifdef CONFIG_FAIR_GROUP_SCHED
- init_task_group.se = (struct sched_entity **)ptr;
+ root_task_group.se = (struct sched_entity **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
- init_task_group.cfs_rq = (struct cfs_rq **)ptr;
+ root_task_group.cfs_rq = (struct cfs_rq **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
- init_task_group.rt_se = (struct sched_rt_entity **)ptr;
+ root_task_group.rt_se = (struct sched_rt_entity **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
- init_task_group.rt_rq = (struct rt_rq **)ptr;
+ root_task_group.rt_rq = (struct rt_rq **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
#endif /* CONFIG_RT_GROUP_SCHED */
@@ -7939,13 +7937,13 @@ void __init sched_init(void)
global_rt_period(), global_rt_runtime());
#ifdef CONFIG_RT_GROUP_SCHED
- init_rt_bandwidth(&init_task_group.rt_bandwidth,
+ init_rt_bandwidth(&root_task_group.rt_bandwidth,
global_rt_period(), global_rt_runtime());
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_CGROUP_SCHED
- list_add(&init_task_group.list, &task_groups);
- INIT_LIST_HEAD(&init_task_group.children);
+ list_add(&root_task_group.list, &task_groups);
+ INIT_LIST_HEAD(&root_task_group.children);
autogroup_init(&init_task);
#endif /* CONFIG_CGROUP_SCHED */
@@ -7960,34 +7958,34 @@ void __init sched_init(void)
init_cfs_rq(&rq->cfs, rq);
init_rt_rq(&rq->rt, rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
- init_task_group.shares = init_task_group_load;
+ root_task_group.shares = root_task_group_load;
INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
/*
- * How much cpu bandwidth does init_task_group get?
+ * How much cpu bandwidth does root_task_group get?
*
* In case of task-groups formed thr' the cgroup filesystem, it
* gets 100% of the cpu resources in the system. This overall
* system cpu resource is divided among the tasks of
- * init_task_group and its child task-groups in a fair manner,
+ * root_task_group and its child task-groups in a fair manner,
* based on each entity's (task or task-group's) weight
* (se->load.weight).
*
- * In other words, if init_task_group has 10 tasks of weight
+ * In other words, if root_task_group has 10 tasks of weight
* 1024) and two child groups A0 and A1 (of weight 1024 each),
* then A0's share of the cpu resource is:
*
* A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
*
- * We achieve this by letting init_task_group's tasks sit
- * directly in rq->cfs (i.e init_task_group->se[] = NULL).
+ * We achieve this by letting root_task_group's tasks sit
+ * directly in rq->cfs (i.e root_task_group->se[] = NULL).
*/
- init_tg_cfs_entry(&init_task_group, &rq->cfs, NULL, i, NULL);
+ init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, NULL);
#endif /* CONFIG_FAIR_GROUP_SCHED */
rq->rt.rt_runtime = def_rt_bandwidth.rt_runtime;
#ifdef CONFIG_RT_GROUP_SCHED
INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
- init_tg_rt_entry(&init_task_group, &rq->rt, NULL, i, NULL);
+ init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL);
#endif
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
@@ -8379,6 +8377,7 @@ static void free_sched_group(struct task_group *tg)
{
free_fair_sched_group(tg);
free_rt_sched_group(tg);
+ autogroup_free(tg);
kfree(tg);
}
@@ -8812,7 +8811,7 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
if (!cgrp->parent) {
/* This is early initialization for the top cgroup */
- return &init_task_group.css;
+ return &root_task_group.css;
}
parent = cgroup_tg(cgrp->parent);
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c
index c80fedc..32a723b 100644
--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -9,10 +9,10 @@ unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
static struct autogroup autogroup_default;
static atomic_t autogroup_seq_nr;
-static void autogroup_init(struct task_struct *init_task)
+static void __init autogroup_init(struct task_struct *init_task)
{
- autogroup_default.tg = &init_task_group;
- init_task_group.autogroup = &autogroup_default;
+ autogroup_default.tg = &root_task_group;
+ root_task_group.autogroup = &autogroup_default;
kref_init(&autogroup_default.kref);
init_rwsem(&autogroup_default.lock);
init_task->signal->autogroup = &autogroup_default;
@@ -63,7 +63,7 @@ static inline struct autogroup *autogroup_create(void)
if (!ag)
goto out_fail;
- tg = sched_create_group(&init_task_group);
+ tg = sched_create_group(&root_task_group);
if (IS_ERR(tg))
goto out_free;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index d4d918a..0823778 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -70,7 +70,7 @@ char *softirq_to_name[NR_SOFTIRQS] = {
static void wakeup_softirqd(void)
{
/* Interrupts are disabled: no need to stop preemption */
- struct task_struct *tsk = __get_cpu_var(ksoftirqd);
+ struct task_struct *tsk = __this_cpu_read(ksoftirqd);
if (tsk && tsk->state != TASK_RUNNING)
wake_up_process(tsk);
@@ -388,8 +388,8 @@ void __tasklet_schedule(struct tasklet_struct *t)
local_irq_save(flags);
t->next = NULL;
- *__get_cpu_var(tasklet_vec).tail = t;
- __get_cpu_var(tasklet_vec).tail = &(t->next);
+ *__this_cpu_read(tasklet_vec.tail) = t;
+ __this_cpu_write(tasklet_vec.tail, &(t->next));
raise_softirq_irqoff(TASKLET_SOFTIRQ);
local_irq_restore(flags);
}
@@ -402,8 +402,8 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
local_irq_save(flags);
t->next = NULL;
- *__get_cpu_var(tasklet_hi_vec).tail = t;
- __get_cpu_var(tasklet_hi_vec).tail = &(t->next);
+ *__this_cpu_read(tasklet_hi_vec.tail) = t;
+ __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
raise_softirq_irqoff(HI_SOFTIRQ);
local_irq_restore(flags);
}
@@ -414,8 +414,8 @@ void __tasklet_hi_schedule_first(struct tasklet_struct *t)
{
BUG_ON(!irqs_disabled());
- t->next = __get_cpu_var(tasklet_hi_vec).head;
- __get_cpu_var(tasklet_hi_vec).head = t;
+ t->next = __this_cpu_read(tasklet_hi_vec.head);
+ __this_cpu_write(tasklet_hi_vec.head, t);
__raise_softirq_irqoff(HI_SOFTIRQ);
}
@@ -426,9 +426,9 @@ static void tasklet_action(struct softirq_action *a)
struct tasklet_struct *list;
local_irq_disable();
- list = __get_cpu_var(tasklet_vec).head;
- __get_cpu_var(tasklet_vec).head = NULL;
- __get_cpu_var(tasklet_vec).tail = &__get_cpu_var(tasklet_vec).head;
+ list = __this_cpu_read(tasklet_vec.head);
+ __this_cpu_write(tasklet_vec.head, NULL);
+ __this_cpu_write(tasklet_vec.tail, &__get_cpu_var(tasklet_vec).head);
local_irq_enable();
while (list) {
@@ -449,8 +449,8 @@ static void tasklet_action(struct softirq_action *a)
local_irq_disable();
t->next = NULL;
- *__get_cpu_var(tasklet_vec).tail = t;
- __get_cpu_var(tasklet_vec).tail = &(t->next);
+ *__this_cpu_read(tasklet_vec.tail) = t;
+ __this_cpu_write(tasklet_vec.tail, &(t->next));
__raise_softirq_irqoff(TASKLET_SOFTIRQ);
local_irq_enable();
}
@@ -461,9 +461,9 @@ static void tasklet_hi_action(struct softirq_action *a)
struct tasklet_struct *list;
local_irq_disable();
- list = __get_cpu_var(tasklet_hi_vec).head;
- __get_cpu_var(tasklet_hi_vec).head = NULL;
- __get_cpu_var(tasklet_hi_vec).tail = &__get_cpu_var(tasklet_hi_vec).head;
+ list = __this_cpu_read(tasklet_hi_vec.head);
+ __this_cpu_write(tasklet_hi_vec.head, NULL);
+ __this_cpu_write(tasklet_hi_vec.tail, &__get_cpu_var(tasklet_hi_vec).head);
local_irq_enable();
while (list) {
@@ -484,8 +484,8 @@ static void tasklet_hi_action(struct softirq_action *a)
local_irq_disable();
t->next = NULL;
- *__get_cpu_var(tasklet_hi_vec).tail = t;
- __get_cpu_var(tasklet_hi_vec).tail = &(t->next);
+ *__this_cpu_read(tasklet_hi_vec.tail) = t;
+ __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
__raise_softirq_irqoff(HI_SOFTIRQ);
local_irq_enable();
}
@@ -802,16 +802,16 @@ static void takeover_tasklets(unsigned int cpu)
/* Find end, append list for that CPU. */
if (&per_cpu(tasklet_vec, cpu).head != per_cpu(tasklet_vec, cpu).tail) {
- *(__get_cpu_var(tasklet_vec).tail) = per_cpu(tasklet_vec, cpu).head;
- __get_cpu_var(tasklet_vec).tail = per_cpu(tasklet_vec, cpu).tail;
+ *__this_cpu_read(tasklet_vec.tail) = per_cpu(tasklet_vec, cpu).head;
+ this_cpu_write(tasklet_vec.tail, per_cpu(tasklet_vec, cpu).tail);
per_cpu(tasklet_vec, cpu).head = NULL;
per_cpu(tasklet_vec, cpu).tail = &per_cpu(tasklet_vec, cpu).head;
}
raise_softirq_irqoff(TASKLET_SOFTIRQ);
if (&per_cpu(tasklet_hi_vec, cpu).head != per_cpu(tasklet_hi_vec, cpu).tail) {
- *__get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).head;
- __get_cpu_var(tasklet_hi_vec).tail = per_cpu(tasklet_hi_vec, cpu).tail;
+ *__this_cpu_read(tasklet_hi_vec.tail) = per_cpu(tasklet_hi_vec, cpu).head;
+ __this_cpu_write(tasklet_hi_vec.tail, per_cpu(tasklet_hi_vec, cpu).tail);
per_cpu(tasklet_hi_vec, cpu).head = NULL;
per_cpu(tasklet_hi_vec, cpu).tail = &per_cpu(tasklet_hi_vec, cpu).head;
}
@@ -853,7 +853,7 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
cpumask_any(cpu_online_mask));
case CPU_DEAD:
case CPU_DEAD_FROZEN: {
- static struct sched_param param = {
+ static const struct sched_param param = {
.sched_priority = MAX_RT_PRIO-1
};
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 3308fd7..69691eb 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -89,8 +89,7 @@ static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
return -ENOMEM;
if (!info) {
- int seq = get_cpu_var(taskstats_seqnum)++;
- put_cpu_var(taskstats_seqnum);
+ int seq = this_cpu_inc_return(taskstats_seqnum) - 1;
reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
} else
@@ -612,7 +611,7 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
fill_tgid_exit(tsk);
}
- listeners = &__raw_get_cpu_var(listener_array);
+ listeners = __this_cpu_ptr(&listener_array);
if (list_empty(&listeners->list))
return;
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index c18d7ef..df140cd 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -152,6 +152,7 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
*/
for (sft = 32; sft > 0; sft--) {
tmp = (u64) to << sft;
+ tmp += from / 2;
do_div(tmp, from);
if ((tmp >> sftacc) == 0)
break;
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index b6b898d..051bc80 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -49,7 +49,7 @@ struct tick_device *tick_get_device(int cpu)
*/
int tick_is_oneshot_available(void)
{
- struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
+ struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
return dev && (dev->features & CLOCK_EVT_FEAT_ONESHOT);
}
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index aada0e5..5cbc101 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -95,7 +95,7 @@ int tick_dev_program_event(struct clock_event_device *dev, ktime_t expires,
*/
int tick_program_event(ktime_t expires, int force)
{
- struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
+ struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
return tick_dev_program_event(dev, expires, force);
}
@@ -167,7 +167,7 @@ int tick_oneshot_mode_active(void)
int ret;
local_irq_save(flags);
- ret = __get_cpu_var(tick_cpu_device).mode == TICKDEV_MODE_ONESHOT;
+ ret = __this_cpu_read(tick_cpu_device.mode) == TICKDEV_MODE_ONESHOT;
local_irq_restore(flags);
return ret;
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 562c56e..659732e 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -558,7 +558,7 @@ trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
static int trace_wakeup_test_thread(void *data)
{
/* Make this a RT thread, doesn't need to be too high */
- static struct sched_param param = { .sched_priority = 5 };
+ static const struct sched_param param = { .sched_priority = 5 };
struct completion *x = data;
sched_setscheduler(current, SCHED_FIFO, &param);
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 6e7b575..d7ebdf4 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -118,12 +118,12 @@ static void __touch_watchdog(void)
{
int this_cpu = smp_processor_id();
- __get_cpu_var(watchdog_touch_ts) = get_timestamp(this_cpu);
+ __this_cpu_write(watchdog_touch_ts, get_timestamp(this_cpu));
}
void touch_softlockup_watchdog(void)
{
- __raw_get_cpu_var(watchdog_touch_ts) = 0;
+ __this_cpu_write(watchdog_touch_ts, 0);
}
EXPORT_SYMBOL(touch_softlockup_watchdog);
@@ -167,12 +167,12 @@ void touch_softlockup_watchdog_sync(void)
/* watchdog detector functions */
static int is_hardlockup(void)
{
- unsigned long hrint = __get_cpu_var(hrtimer_interrupts);
+ unsigned long hrint = __this_cpu_read(hrtimer_interrupts);
- if (__get_cpu_var(hrtimer_interrupts_saved) == hrint)
+ if (__this_cpu_read(hrtimer_interrupts_saved) == hrint)
return 1;
- __get_cpu_var(hrtimer_interrupts_saved) = hrint;
+ __this_cpu_write(hrtimer_interrupts_saved, hrint);
return 0;
}
#endif
@@ -205,8 +205,8 @@ static void watchdog_overflow_callback(struct perf_event *event, int nmi,
/* Ensure the watchdog never gets throttled */
event->hw.interrupts = 0;
- if (__get_cpu_var(watchdog_nmi_touch) == true) {
- __get_cpu_var(watchdog_nmi_touch) = false;
+ if (__this_cpu_read(watchdog_nmi_touch) == true) {
+ __this_cpu_write(watchdog_nmi_touch, false);
return;
}
@@ -220,7 +220,7 @@ static void watchdog_overflow_callback(struct perf_event *event, int nmi,
int this_cpu = smp_processor_id();
/* only print hardlockups once */
- if (__get_cpu_var(hard_watchdog_warn) == true)
+ if (__this_cpu_read(hard_watchdog_warn) == true)
return;
if (hardlockup_panic)
@@ -228,16 +228,16 @@ static void watchdog_overflow_callback(struct perf_event *event, int nmi,
else
WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
- __get_cpu_var(hard_watchdog_warn) = true;
+ __this_cpu_write(hard_watchdog_warn, true);
return;
}
- __get_cpu_var(hard_watchdog_warn) = false;
+ __this_cpu_write(hard_watchdog_warn, false);
return;
}
static void watchdog_interrupt_count(void)
{
- __get_cpu_var(hrtimer_interrupts)++;
+ __this_cpu_inc(hrtimer_interrupts);
}
#else
static inline void watchdog_interrupt_count(void) { return; }
@@ -246,7 +246,7 @@ static inline void watchdog_interrupt_count(void) { return; }
/* watchdog kicker functions */
static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
{
- unsigned long touch_ts = __get_cpu_var(watchdog_touch_ts);
+ unsigned long touch_ts = __this_cpu_read(watchdog_touch_ts);
struct pt_regs *regs = get_irq_regs();
int duration;
@@ -254,18 +254,18 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
watchdog_interrupt_count();
/* kick the softlockup detector */
- wake_up_process(__get_cpu_var(softlockup_watchdog));
+ wake_up_process(__this_cpu_read(softlockup_watchdog));
/* .. and repeat */
hrtimer_forward_now(hrtimer, ns_to_ktime(get_sample_period()));
if (touch_ts == 0) {
- if (unlikely(__get_cpu_var(softlockup_touch_sync))) {
+ if (unlikely(__this_cpu_read(softlockup_touch_sync))) {
/*
* If the time stamp was touched atomically
* make sure the scheduler tick is up to date.
*/
- __get_cpu_var(softlockup_touch_sync) = false;
+ __this_cpu_write(softlockup_touch_sync, false);
sched_clock_tick();
}
__touch_watchdog();
@@ -281,7 +281,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
duration = is_softlockup(touch_ts);
if (unlikely(duration)) {
/* only warn once */
- if (__get_cpu_var(soft_watchdog_warn) == true)
+ if (__this_cpu_read(soft_watchdog_warn) == true)
return HRTIMER_RESTART;
printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
@@ -296,9 +296,9 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
if (softlockup_panic)
panic("softlockup: hung tasks");
- __get_cpu_var(soft_watchdog_warn) = true;
+ __this_cpu_write(soft_watchdog_warn, true);
} else
- __get_cpu_var(soft_watchdog_warn) = false;
+ __this_cpu_write(soft_watchdog_warn, false);
return HRTIMER_RESTART;
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e785b0f..8ee6ec8 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -932,6 +932,38 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
wake_up_worker(gcwq);
}
+/*
+ * Test whether @work is being queued from another work executing on the
+ * same workqueue. This is rather expensive and should only be used from
+ * cold paths.
+ */
+static bool is_chained_work(struct workqueue_struct *wq)
+{
+ unsigned long flags;
+ unsigned int cpu;
+
+ for_each_gcwq_cpu(cpu) {
+ struct global_cwq *gcwq = get_gcwq(cpu);
+ struct worker *worker;
+ struct hlist_node *pos;
+ int i;
+
+ spin_lock_irqsave(&gcwq->lock, flags);
+ for_each_busy_worker(worker, i, pos, gcwq) {
+ if (worker->task != current)
+ continue;
+ spin_unlock_irqrestore(&gcwq->lock, flags);
+ /*
+ * I'm @worker, no locking necessary. See if @work
+ * is headed to the same workqueue.
+ */
+ return worker->current_cwq->wq == wq;
+ }
+ spin_unlock_irqrestore(&gcwq->lock, flags);
+ }
+ return false;
+}
+
static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
struct work_struct *work)
{
@@ -943,7 +975,9 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
debug_work_activate(work);
- if (WARN_ON_ONCE(wq->flags & WQ_DYING))
+ /* if dying, only works from the same workqueue are allowed */
+ if (unlikely(wq->flags & WQ_DYING) &&
+ WARN_ON_ONCE(!is_chained_work(wq)))
return;
/* determine gcwq to use */
@@ -2936,11 +2970,35 @@ EXPORT_SYMBOL_GPL(__alloc_workqueue_key);
*/
void destroy_workqueue(struct workqueue_struct *wq)
{
+ unsigned int flush_cnt = 0;
unsigned int cpu;
+ /*
+ * Mark @wq dying and drain all pending works. Once WQ_DYING is
+ * set, only chain queueing is allowed. IOW, only currently
+ * pending or running work items on @wq can queue further work
+ * items on it. @wq is flushed repeatedly until it becomes empty.
+ * The number of flushing is detemined by the depth of chaining and
+ * should be relatively short. Whine if it takes too long.
+ */
wq->flags |= WQ_DYING;
+reflush:
flush_workqueue(wq);
+ for_each_cwq_cpu(cpu, wq) {
+ struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+ if (!cwq->nr_active && list_empty(&cwq->delayed_works))
+ continue;
+
+ if (++flush_cnt == 10 ||
+ (flush_cnt % 100 == 0 && flush_cnt <= 1000))
+ printk(KERN_WARNING "workqueue %s: flush on "
+ "destruction isn't complete after %u tries\n",
+ wq->name, flush_cnt);
+ goto reflush;
+ }
+
/*
* wq list is used to freeze wq, remove from list after
* flushing is complete in case freeze races us.
generated by cgit v1.1 at 2024-05-27 14:22:54 +0000