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Merge branch 'linus' into xen-64bit

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This commit is contained in:
Ingo Molnar
2008-07-17 23:57:20 +02:00
parent 93a0886e23 5b664cb235
commit 393d81aa02
508 changed files with 57071 additions and 16846 deletions
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3
kernel/Makefile
View File

@@ -11,8 +11,6 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
notifier.o ksysfs.o pm_qos_params.o sched_clock.o
CFLAGS_REMOVE_sched.o = -mno-spe
ifdef CONFIG_FTRACE
# Do not trace debug files and internal ftrace files
CFLAGS_REMOVE_lockdep.o = -pg
@@ -21,6 +19,7 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
CFLAGS_REMOVE_rtmutex-debug.o = -pg
CFLAGS_REMOVE_cgroup-debug.o = -pg
CFLAGS_REMOVE_sched_clock.o = -pg
CFLAGS_REMOVE_sched.o = -mno-spe -pg
endif
obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o

1
kernel/cpu.c
View File

@@ -299,6 +299,7 @@ int __ref cpu_down(unsigned int cpu)
cpu_maps_update_done();
return err;
}
EXPORT_SYMBOL(cpu_down);
#endif /*CONFIG_HOTPLUG_CPU*/
/* Requires cpu_add_remove_lock to be held */

457
kernel/exit.c
View File

@@ -71,7 +71,7 @@ static void __unhash_process(struct task_struct *p)
__get_cpu_var(process_counts)--;
}
list_del_rcu(&p->thread_group);
remove_parent(p);
list_del_init(&p->sibling);
}
/*
@@ -152,6 +152,18 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
put_task_struct(container_of(rhp, struct task_struct, rcu));
}
/*
* Do final ptrace-related cleanup of a zombie being reaped.
*
* Called with write_lock(&tasklist_lock) held.
*/
static void ptrace_release_task(struct task_struct *p)
{
BUG_ON(!list_empty(&p->ptraced));
ptrace_unlink(p);
BUG_ON(!list_empty(&p->ptrace_entry));
}
void release_task(struct task_struct * p)
{
struct task_struct *leader;
@@ -160,8 +172,7 @@ repeat:
atomic_dec(&p->user->processes);
proc_flush_task(p);
write_lock_irq(&tasklist_lock);
ptrace_unlink(p);
BUG_ON(!list_empty(&p->ptrace_list) || !list_empty(&p->ptrace_children));
ptrace_release_task(p);
__exit_signal(p);
/*
@@ -315,9 +326,8 @@ static void reparent_to_kthreadd(void)
ptrace_unlink(current);
/* Reparent to init */
remove_parent(current);
current->real_parent = current->parent = kthreadd_task;
add_parent(current);
list_move_tail(&current->sibling, &current->real_parent->children);
/* Set the exit signal to SIGCHLD so we signal init on exit */
current->exit_signal = SIGCHLD;
@@ -692,37 +702,97 @@ static void exit_mm(struct task_struct * tsk)
mmput(mm);
}
static void
reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
/*
* Return nonzero if @parent's children should reap themselves.
*
* Called with write_lock_irq(&tasklist_lock) held.
*/
static int ignoring_children(struct task_struct *parent)
{
int ret;
struct sighand_struct *psig = parent->sighand;
unsigned long flags;
spin_lock_irqsave(&psig->siglock, flags);
ret = (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN ||
(psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT));
spin_unlock_irqrestore(&psig->siglock, flags);
return ret;
}
/*
* Detach all tasks we were using ptrace on.
* Any that need to be release_task'd are put on the @dead list.
*
* Called with write_lock(&tasklist_lock) held.
*/
static void ptrace_exit(struct task_struct *parent, struct list_head *dead)
{
struct task_struct *p, *n;
int ign = -1;
list_for_each_entry_safe(p, n, &parent->ptraced, ptrace_entry) {
__ptrace_unlink(p);
if (p->exit_state != EXIT_ZOMBIE)
continue;
/*
* If it's a zombie, our attachedness prevented normal
* parent notification or self-reaping. Do notification
* now if it would have happened earlier. If it should
* reap itself, add it to the @dead list. We can't call
* release_task() here because we already hold tasklist_lock.
*
* If it's our own child, there is no notification to do.
* But if our normal children self-reap, then this child
* was prevented by ptrace and we must reap it now.
*/
if (!task_detached(p) && thread_group_empty(p)) {
if (!same_thread_group(p->real_parent, parent))
do_notify_parent(p, p->exit_signal);
else {
if (ign < 0)
ign = ignoring_children(parent);
if (ign)
p->exit_signal = -1;
}
}
if (task_detached(p)) {
/*
* Mark it as in the process of being reaped.
*/
p->exit_state = EXIT_DEAD;
list_add(&p->ptrace_entry, dead);
}
}
}
/*
* Finish up exit-time ptrace cleanup.
*
* Called without locks.
*/
static void ptrace_exit_finish(struct task_struct *parent,
struct list_head *dead)
{
struct task_struct *p, *n;
BUG_ON(!list_empty(&parent->ptraced));
list_for_each_entry_safe(p, n, dead, ptrace_entry) {
list_del_init(&p->ptrace_entry);
release_task(p);
}
}
static void reparent_thread(struct task_struct *p, struct task_struct *father)
{
if (p->pdeath_signal)
/* We already hold the tasklist_lock here. */
group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
/* Move the child from its dying parent to the new one. */
if (unlikely(traced)) {
/* Preserve ptrace links if someone else is tracing this child. */
list_del_init(&p->ptrace_list);
if (ptrace_reparented(p))
list_add(&p->ptrace_list, &p->real_parent->ptrace_children);
} else {
/* If this child is being traced, then we're the one tracing it
* anyway, so let go of it.
*/
p->ptrace = 0;
remove_parent(p);
p->parent = p->real_parent;
add_parent(p);
if (task_is_traced(p)) {
/*
* If it was at a trace stop, turn it into
* a normal stop since it's no longer being
* traced.
*/
ptrace_untrace(p);
}
}
list_move_tail(&p->sibling, &p->real_parent->children);
/* If this is a threaded reparent there is no need to
* notify anyone anything has happened.
@@ -737,7 +807,8 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
/* If we'd notified the old parent about this child's death,
* also notify the new parent.
*/
if (!traced && p->exit_state == EXIT_ZOMBIE &&
if (!ptrace_reparented(p) &&
p->exit_state == EXIT_ZOMBIE &&
!task_detached(p) && thread_group_empty(p))
do_notify_parent(p, p->exit_signal);
@@ -754,12 +825,15 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
static void forget_original_parent(struct task_struct *father)
{
struct task_struct *p, *n, *reaper = father;
struct list_head ptrace_dead;
INIT_LIST_HEAD(&ptrace_dead);
LIST_HEAD(ptrace_dead);
write_lock_irq(&tasklist_lock);
/*
* First clean up ptrace if we were using it.
*/
ptrace_exit(father, &ptrace_dead);
do {
reaper = next_thread(reaper);
if (reaper == father) {
@@ -768,58 +842,19 @@ static void forget_original_parent(struct task_struct *father)
}
} while (reaper->flags & PF_EXITING);
/*
* There are only two places where our children can be:
*
* - in our child list
* - in our ptraced child list
*
* Search them and reparent children.
*/
list_for_each_entry_safe(p, n, &father->children, sibling) {
int ptrace;
ptrace = p->ptrace;
/* if father isn't the real parent, then ptrace must be enabled */
BUG_ON(father != p->real_parent && !ptrace);
if (father == p->real_parent) {
/* reparent with a reaper, real father it's us */
p->real_parent = reaper;
reparent_thread(p, father, 0);
} else {
/* reparent ptraced task to its real parent */
__ptrace_unlink (p);
if (p->exit_state == EXIT_ZOMBIE && !task_detached(p) &&
thread_group_empty(p))
do_notify_parent(p, p->exit_signal);
}
/*
* if the ptraced child is a detached zombie we must collect
* it before we exit, or it will remain zombie forever since
* we prevented it from self-reap itself while it was being
* traced by us, to be able to see it in wait4.
*/
if (unlikely(ptrace && p->exit_state == EXIT_ZOMBIE && task_detached(p)))
list_add(&p->ptrace_list, &ptrace_dead);
}
list_for_each_entry_safe(p, n, &father->ptrace_children, ptrace_list) {
p->real_parent = reaper;
reparent_thread(p, father, 1);
if (p->parent == father) {
BUG_ON(p->ptrace);
p->parent = p->real_parent;
}
reparent_thread(p, father);
}
write_unlock_irq(&tasklist_lock);
BUG_ON(!list_empty(&father->children));
BUG_ON(!list_empty(&father->ptrace_children));
list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_list) {
list_del_init(&p->ptrace_list);
release_task(p);
}
ptrace_exit_finish(father, &ptrace_dead);
}
/*
@@ -1180,13 +1215,6 @@ static int eligible_child(enum pid_type type, struct pid *pid, int options,
return 0;
}
/*
* Do not consider detached threads that are
* not ptraced:
*/
if (task_detached(p) && !p->ptrace)
return 0;
/* Wait for all children (clone and not) if __WALL is set;
* otherwise, wait for clone children *only* if __WCLONE is
* set; otherwise, wait for non-clone children *only*. (Note:
@@ -1197,14 +1225,10 @@ static int eligible_child(enum pid_type type, struct pid *pid, int options,
return 0;
err = security_task_wait(p);
if (likely(!err))
return 1;
if (err)
return err;
if (type != PIDTYPE_PID)
return 0;
/* This child was explicitly requested, abort */
read_unlock(&tasklist_lock);
return err;
return 1;
}
static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid,
@@ -1238,7 +1262,7 @@ static int wait_noreap_copyout(struct task_struct *p, pid_t pid, uid_t uid,
* the lock and this task is uninteresting. If we return nonzero, we have
* released the lock and the system call should return.
*/
static int wait_task_zombie(struct task_struct *p, int noreap,
static int wait_task_zombie(struct task_struct *p, int options,
struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
@@ -1246,7 +1270,10 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
int retval, status, traced;
pid_t pid = task_pid_vnr(p);
if (unlikely(noreap)) {
if (!likely(options & WEXITED))
return 0;
if (unlikely(options & WNOWAIT)) {
uid_t uid = p->uid;
int exit_code = p->exit_code;
int why, status;
@@ -1396,21 +1423,24 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
* the lock and this task is uninteresting. If we return nonzero, we have
* released the lock and the system call should return.
*/
static int wait_task_stopped(struct task_struct *p,
int noreap, struct siginfo __user *infop,
static int wait_task_stopped(int ptrace, struct task_struct *p,
int options, struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
int retval, exit_code, why;
uid_t uid = 0; /* unneeded, required by compiler */
pid_t pid;
if (!(options & WUNTRACED))
return 0;
exit_code = 0;
spin_lock_irq(&p->sighand->siglock);
if (unlikely(!task_is_stopped_or_traced(p)))
goto unlock_sig;
if (!(p->ptrace & PT_PTRACED) && p->signal->group_stop_count > 0)
if (!ptrace && p->signal->group_stop_count > 0)
/*
* A group stop is in progress and this is the group leader.
* We won't report until all threads have stopped.
@@ -1421,7 +1451,7 @@ static int wait_task_stopped(struct task_struct *p,
if (!exit_code)
goto unlock_sig;
if (!noreap)
if (!unlikely(options & WNOWAIT))
p->exit_code = 0;
uid = p->uid;
@@ -1439,10 +1469,10 @@ unlock_sig:
*/
get_task_struct(p);
pid = task_pid_vnr(p);
why = (p->ptrace & PT_PTRACED) ? CLD_TRAPPED : CLD_STOPPED;
why = ptrace ? CLD_TRAPPED : CLD_STOPPED;
read_unlock(&tasklist_lock);
if (unlikely(noreap))
if (unlikely(options & WNOWAIT))
return wait_noreap_copyout(p, pid, uid,
why, exit_code,
infop, ru);
@@ -1476,7 +1506,7 @@ unlock_sig:
* the lock and this task is uninteresting. If we return nonzero, we have
* released the lock and the system call should return.
*/
static int wait_task_continued(struct task_struct *p, int noreap,
static int wait_task_continued(struct task_struct *p, int options,
struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
@@ -1484,6 +1514,9 @@ static int wait_task_continued(struct task_struct *p, int noreap,
pid_t pid;
uid_t uid;
if (!unlikely(options & WCONTINUED))
return 0;
if (!(p->signal->flags & SIGNAL_STOP_CONTINUED))
return 0;
@@ -1493,7 +1526,7 @@ static int wait_task_continued(struct task_struct *p, int noreap,
spin_unlock_irq(&p->sighand->siglock);
return 0;
}
if (!noreap)
if (!unlikely(options & WNOWAIT))
p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
spin_unlock_irq(&p->sighand->siglock);
@@ -1519,89 +1552,161 @@ static int wait_task_continued(struct task_struct *p, int noreap,
return retval;
}
/*
* Consider @p for a wait by @parent.
*
* -ECHILD should be in *@notask_error before the first call.
* Returns nonzero for a final return, when we have unlocked tasklist_lock.
* Returns zero if the search for a child should continue;
* then *@notask_error is 0 if @p is an eligible child,
* or another error from security_task_wait(), or still -ECHILD.
*/
static int wait_consider_task(struct task_struct *parent, int ptrace,
struct task_struct *p, int *notask_error,
enum pid_type type, struct pid *pid, int options,
struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
int ret = eligible_child(type, pid, options, p);
if (!ret)
return ret;
if (unlikely(ret < 0)) {
/*
* If we have not yet seen any eligible child,
* then let this error code replace -ECHILD.
* A permission error will give the user a clue
* to look for security policy problems, rather
* than for mysterious wait bugs.
*/
if (*notask_error)
*notask_error = ret;
}
if (likely(!ptrace) && unlikely(p->ptrace)) {
/*
* This child is hidden by ptrace.
* We aren't allowed to see it now, but eventually we will.
*/
*notask_error = 0;
return 0;
}
if (p->exit_state == EXIT_DEAD)
return 0;
/*
* We don't reap group leaders with subthreads.
*/
if (p->exit_state == EXIT_ZOMBIE && !delay_group_leader(p))
return wait_task_zombie(p, options, infop, stat_addr, ru);
/*
* It's stopped or running now, so it might
* later continue, exit, or stop again.
*/
*notask_error = 0;
if (task_is_stopped_or_traced(p))
return wait_task_stopped(ptrace, p, options,
infop, stat_addr, ru);
return wait_task_continued(p, options, infop, stat_addr, ru);
}
/*
* Do the work of do_wait() for one thread in the group, @tsk.
*
* -ECHILD should be in *@notask_error before the first call.
* Returns nonzero for a final return, when we have unlocked tasklist_lock.
* Returns zero if the search for a child should continue; then
* *@notask_error is 0 if there were any eligible children,
* or another error from security_task_wait(), or still -ECHILD.
*/
static int do_wait_thread(struct task_struct *tsk, int *notask_error,
enum pid_type type, struct pid *pid, int options,
struct siginfo __user *infop, int __user *stat_addr,
struct rusage __user *ru)
{
struct task_struct *p;
list_for_each_entry(p, &tsk->children, sibling) {
/*
* Do not consider detached threads.
*/
if (!task_detached(p)) {
int ret = wait_consider_task(tsk, 0, p, notask_error,
type, pid, options,
infop, stat_addr, ru);
if (ret)
return ret;
}
}
return 0;
}
static int ptrace_do_wait(struct task_struct *tsk, int *notask_error,
enum pid_type type, struct pid *pid, int options,
struct siginfo __user *infop, int __user *stat_addr,
struct rusage __user *ru)
{
struct task_struct *p;
/*
* Traditionally we see ptrace'd stopped tasks regardless of options.
*/
options |= WUNTRACED;
list_for_each_entry(p, &tsk->ptraced, ptrace_entry) {
int ret = wait_consider_task(tsk, 1, p, notask_error,
type, pid, options,
infop, stat_addr, ru);
if (ret)
return ret;
}
return 0;
}
static long do_wait(enum pid_type type, struct pid *pid, int options,
struct siginfo __user *infop, int __user *stat_addr,
struct rusage __user *ru)
{
DECLARE_WAITQUEUE(wait, current);
struct task_struct *tsk;
int flag, retval;
int retval;
add_wait_queue(&current->signal->wait_chldexit,&wait);
repeat:
/* If there is nothing that can match our critier just get out */
/*
* If there is nothing that can match our critiera just get out.
* We will clear @retval to zero if we see any child that might later
* match our criteria, even if we are not able to reap it yet.
*/
retval = -ECHILD;
if ((type < PIDTYPE_MAX) && (!pid || hlist_empty(&pid->tasks[type])))
goto end;
/*
* We will set this flag if we see any child that might later
* match our criteria, even if we are not able to reap it yet.
*/
flag = retval = 0;
current->state = TASK_INTERRUPTIBLE;
read_lock(&tasklist_lock);
tsk = current;
do {
struct task_struct *p;
list_for_each_entry(p, &tsk->children, sibling) {
int ret = eligible_child(type, pid, options, p);
if (!ret)
continue;
if (unlikely(ret < 0)) {
retval = ret;
} else if (task_is_stopped_or_traced(p)) {
/*
* It's stopped now, so it might later
* continue, exit, or stop again.
*/
flag = 1;
if (!(p->ptrace & PT_PTRACED) &&
!(options & WUNTRACED))
continue;
retval = wait_task_stopped(p,
(options & WNOWAIT), infop,
stat_addr, ru);
} else if (p->exit_state == EXIT_ZOMBIE &&
!delay_group_leader(p)) {
/*
* We don't reap group leaders with subthreads.
*/
if (!likely(options & WEXITED))
continue;
retval = wait_task_zombie(p,
(options & WNOWAIT), infop,
stat_addr, ru);
} else if (p->exit_state != EXIT_DEAD) {
/*
* It's running now, so it might later
* exit, stop, or stop and then continue.
*/
flag = 1;
if (!unlikely(options & WCONTINUED))
continue;
retval = wait_task_continued(p,
(options & WNOWAIT), infop,
stat_addr, ru);
}
if (retval != 0) /* tasklist_lock released */
goto end;
}
if (!flag) {
list_for_each_entry(p, &tsk->ptrace_children,
ptrace_list) {
flag = eligible_child(type, pid, options, p);
if (!flag)
continue;
if (likely(flag > 0))
break;
retval = flag;
goto end;
}
int tsk_result = do_wait_thread(tsk, &retval,
type, pid, options,
infop, stat_addr, ru);
if (!tsk_result)
tsk_result = ptrace_do_wait(tsk, &retval,
type, pid, options,
infop, stat_addr, ru);
if (tsk_result) {
/*
* tasklist_lock is unlocked and we have a final result.
*/
retval = tsk_result;
goto end;
}
if (options & __WNOTHREAD)
break;
tsk = next_thread(tsk);
@@ -1609,16 +1714,14 @@ repeat:
} while (tsk != current);
read_unlock(&tasklist_lock);
if (flag) {
if (options & WNOHANG)
goto end;
if (!retval && !(options & WNOHANG)) {
retval = -ERESTARTSYS;
if (signal_pending(current))
goto end;
schedule();
goto repeat;
if (!signal_pending(current)) {
schedule();
goto repeat;
}
}
retval = -ECHILD;
end:
current->state = TASK_RUNNING;
remove_wait_queue(&current->signal->wait_chldexit,&wait);

6
kernel/fork.c
View File

@@ -1125,8 +1125,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
*/
p->group_leader = p;
INIT_LIST_HEAD(&p->thread_group);
INIT_LIST_HEAD(&p->ptrace_children);
INIT_LIST_HEAD(&p->ptrace_list);
INIT_LIST_HEAD(&p->ptrace_entry);
INIT_LIST_HEAD(&p->ptraced);
/* Now that the task is set up, run cgroup callbacks if
* necessary. We need to run them before the task is visible
@@ -1198,7 +1198,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
}
if (likely(p->pid)) {
add_parent(p);
list_add_tail(&p->sibling, &p->real_parent->children);
if (unlikely(p->ptrace & PT_PTRACED))
__ptrace_link(p, current->parent);

2
kernel/kthread.c
View File

@@ -235,7 +235,7 @@ int kthreadd(void *unused)
set_user_nice(tsk, KTHREAD_NICE_LEVEL);
set_cpus_allowed(tsk, CPU_MASK_ALL);
current->flags |= PF_NOFREEZE;
current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);

50
kernel/power/disk.c
View File

@@ -179,6 +179,17 @@ static void platform_restore_cleanup(int platform_mode)
hibernation_ops->restore_cleanup();
}
/**
* platform_recover - recover the platform from a failure to suspend
* devices.
*/
static void platform_recover(int platform_mode)
{
if (platform_mode && hibernation_ops && hibernation_ops->recover)
hibernation_ops->recover();
}
/**
* create_image - freeze devices that need to be frozen with interrupts
* off, create the hibernation image and thaw those devices. Control
@@ -193,6 +204,7 @@ static int create_image(int platform_mode)
if (error)
return error;
device_pm_lock();
local_irq_disable();
/* At this point, device_suspend() has been called, but *not*
* device_power_down(). We *must* call device_power_down() now.
@@ -224,9 +236,11 @@ static int create_image(int platform_mode)
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
device_power_up();
device_power_up(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
Enable_irqs:
local_irq_enable();
device_pm_unlock();
return error;
}
@@ -255,10 +269,10 @@ int hibernation_snapshot(int platform_mode)
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Resume_console;
goto Recover_platform;
if (hibernation_test(TEST_DEVICES))
goto Resume_devices;
goto Recover_platform;
error = platform_pre_snapshot(platform_mode);
if (error || hibernation_test(TEST_PLATFORM))
@@ -280,12 +294,16 @@ int hibernation_snapshot(int platform_mode)
Finish:
platform_finish(platform_mode);
Resume_devices:
device_resume();
Resume_console:
device_resume(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
resume_console();
Close:
platform_end(platform_mode);
return error;
Recover_platform:
platform_recover(platform_mode);
goto Resume_devices;
}
/**
@@ -300,8 +318,9 @@ static int resume_target_kernel(void)
{
int error;
device_pm_lock();
local_irq_disable();
error = device_power_down(PMSG_PRETHAW);
error = device_power_down(PMSG_QUIESCE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
"aborting resume\n");
@@ -329,9 +348,10 @@ static int resume_target_kernel(void)
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
device_power_up();
device_power_up(PMSG_RECOVER);
Enable_irqs:
local_irq_enable();
device_pm_unlock();
return error;
}
@@ -350,7 +370,7 @@ int hibernation_restore(int platform_mode)
pm_prepare_console();
suspend_console();
error = device_suspend(PMSG_PRETHAW);
error = device_suspend(PMSG_QUIESCE);
if (error)
goto Finish;
@@ -362,7 +382,7 @@ int hibernation_restore(int platform_mode)
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
device_resume();
device_resume(PMSG_RECOVER);
Finish:
resume_console();
pm_restore_console();
@@ -392,8 +412,11 @@ int hibernation_platform_enter(void)
suspend_console();
error = device_suspend(PMSG_HIBERNATE);
if (error)
goto Resume_console;
if (error) {
if (hibernation_ops->recover)
hibernation_ops->recover();
goto Resume_devices;
}
error = hibernation_ops->prepare();
if (error)
@@ -403,6 +426,7 @@ int hibernation_platform_enter(void)
if (error)
goto Finish;
device_pm_lock();
local_irq_disable();
error = device_power_down(PMSG_HIBERNATE);
if (!error) {
@@ -411,6 +435,7 @@ int hibernation_platform_enter(void)
while (1);
}
local_irq_enable();
device_pm_unlock();
/*
* We don't need to reenable the nonboot CPUs or resume consoles, since
@@ -419,8 +444,7 @@ int hibernation_platform_enter(void)
Finish:
hibernation_ops->finish();
Resume_devices:
device_resume();
Resume_console:
device_resume(PMSG_RESTORE);
resume_console();
Close:
hibernation_ops->end();

16
kernel/power/main.c
View File

@@ -228,6 +228,7 @@ static int suspend_enter(suspend_state_t state)
{
int error = 0;
device_pm_lock();
arch_suspend_disable_irqs();
BUG_ON(!irqs_disabled());
@@ -239,10 +240,11 @@ static int suspend_enter(suspend_state_t state)
if (!suspend_test(TEST_CORE))
error = suspend_ops->enter(state);
device_power_up();
device_power_up(PMSG_RESUME);
Done:
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
device_pm_unlock();
return error;
}
@@ -267,11 +269,11 @@ int suspend_devices_and_enter(suspend_state_t state)
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Resume_console;
goto Recover_platform;
}
if (suspend_test(TEST_DEVICES))
goto Resume_devices;
goto Recover_platform;
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
@@ -291,13 +293,17 @@ int suspend_devices_and_enter(suspend_state_t state)
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices:
device_resume();
Resume_console:
device_resume(PMSG_RESUME);
resume_console();
Close:
if (suspend_ops->end)
suspend_ops->end();
return error;
Recover_platform:
if (suspend_ops->recover)
suspend_ops->recover();
goto Resume_devices;
}
/**

99
kernel/power/process.c
View File

@@ -19,9 +19,6 @@
*/
#define TIMEOUT (20 * HZ)
#define FREEZER_KERNEL_THREADS 0
#define FREEZER_USER_SPACE 1
static inline int freezeable(struct task_struct * p)
{
if ((p == current) ||
@@ -84,63 +81,53 @@ static void fake_signal_wake_up(struct task_struct *p)
spin_unlock_irqrestore(&p->sighand->siglock, flags);
}
static int has_mm(struct task_struct *p)
static inline bool should_send_signal(struct task_struct *p)
{
return (p->mm && !(p->flags & PF_BORROWED_MM));
return !(p->flags & PF_FREEZER_NOSIG);
}
/**
* freeze_task - send a freeze request to given task
* @p: task to send the request to
* @with_mm_only: if set, the request will only be sent if the task has its
* own mm
* Return value: 0, if @with_mm_only is set and the task has no mm of its
* own or the task is frozen, 1, otherwise
* @sig_only: if set, the request will only be sent if the task has the
* PF_FREEZER_NOSIG flag unset
* Return value: 'false', if @sig_only is set and the task has
* PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
*
* The freeze request is sent by seting the tasks's TIF_FREEZE flag and
* The freeze request is sent by setting the tasks's TIF_FREEZE flag and
* either sending a fake signal to it or waking it up, depending on whether
* or not it has its own mm (ie. it is a user land task). If @with_mm_only
* is set and the task has no mm of its own (ie. it is a kernel thread),
* its TIF_FREEZE flag should not be set.
*
* The task_lock() is necessary to prevent races with exit_mm() or
* use_mm()/unuse_mm() from occuring.
* or not it has PF_FREEZER_NOSIG set. If @sig_only is set and the task
* has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
* TIF_FREEZE flag will not be set.
*/
static int freeze_task(struct task_struct *p, int with_mm_only)
static bool freeze_task(struct task_struct *p, bool sig_only)
{
int ret = 1;
task_lock(p);
if (freezing(p)) {
if (has_mm(p)) {
if (!signal_pending(p))
fake_signal_wake_up(p);
} else {
if (with_mm_only)
ret = 0;
else
wake_up_state(p, TASK_INTERRUPTIBLE);
}
} else {
/*
* We first check if the task is freezing and next if it has already
* been frozen to avoid the race with frozen_process() which first marks
* the task as frozen and next clears its TIF_FREEZE.
*/
if (!freezing(p)) {
rmb();
if (frozen(p)) {
ret = 0;
} else {
if (has_mm(p)) {
set_freeze_flag(p);
fake_signal_wake_up(p);
} else {
if (with_mm_only) {
ret = 0;
} else {
set_freeze_flag(p);
wake_up_state(p, TASK_INTERRUPTIBLE);
}
}
}
if (frozen(p))
return false;
if (!sig_only || should_send_signal(p))
set_freeze_flag(p);
else
return false;
}
task_unlock(p);
return ret;
if (should_send_signal(p)) {
if (!signal_pending(p))
fake_signal_wake_up(p);
} else if (sig_only) {
return false;
} else {
wake_up_state(p, TASK_INTERRUPTIBLE);
}
return true;
}
static void cancel_freezing(struct task_struct *p)
@@ -156,7 +143,7 @@ static void cancel_freezing(struct task_struct *p)
}
}
static int try_to_freeze_tasks(int freeze_user_space)
static int try_to_freeze_tasks(bool sig_only)
{
struct task_struct *g, *p;
unsigned long end_time;
@@ -175,7 +162,7 @@ static int try_to_freeze_tasks(int freeze_user_space)
if (frozen(p) || !freezeable(p))
continue;
if (!freeze_task(p, freeze_user_space))
if (!freeze_task(p, sig_only))
continue;
/*
@@ -235,13 +222,13 @@ int freeze_processes(void)
int error;
printk("Freezing user space processes ... ");
error = try_to_freeze_tasks(FREEZER_USER_SPACE);
error = try_to_freeze_tasks(true);
if (error)
goto Exit;
printk("done.\n");
printk("Freezing remaining freezable tasks ... ");
error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
error = try_to_freeze_tasks(false);
if (error)
goto Exit;
printk("done.");
@@ -251,7 +238,7 @@ int freeze_processes(void)
return error;
}
static void thaw_tasks(int thaw_user_space)
static void thaw_tasks(bool nosig_only)
{
struct task_struct *g, *p;
@@ -260,7 +247,7 @@ static void thaw_tasks(int thaw_user_space)
if (!freezeable(p))
continue;
if (!p->mm == thaw_user_space)
if (nosig_only && should_send_signal(p))
continue;
thaw_process(p);
@@ -271,8 +258,8 @@ static void thaw_tasks(int thaw_user_space)
void thaw_processes(void)
{
printk("Restarting tasks ... ");
thaw_tasks(FREEZER_KERNEL_THREADS);
thaw_tasks(FREEZER_USER_SPACE);
thaw_tasks(true);
thaw_tasks(false);
schedule();
printk("done.\n");
}

71
kernel/power/user.c
View File

@@ -23,6 +23,7 @@
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
@@ -69,16 +70,22 @@ static int snapshot_open(struct inode *inode, struct file *filp)
struct snapshot_data *data;
int error;
if (!atomic_add_unless(&snapshot_device_available, -1, 0))
return -EBUSY;
mutex_lock(&pm_mutex);
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
goto Unlock;
}
if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
atomic_inc(&snapshot_device_available);
return -ENOSYS;
error = -ENOSYS;
goto Unlock;
}
if(create_basic_memory_bitmaps()) {
atomic_inc(&snapshot_device_available);
return -ENOMEM;
error = -ENOMEM;
goto Unlock;
}
nonseekable_open(inode, filp);
data = &snapshot_state;
@@ -98,33 +105,36 @@ static int snapshot_open(struct inode *inode, struct file *filp)
if (error)
pm_notifier_call_chain(PM_POST_HIBERNATION);
}
if (error) {
if (error)
atomic_inc(&snapshot_device_available);
return error;
}
data->frozen = 0;
data->ready = 0;
data->platform_support = 0;
return 0;
Unlock:
mutex_unlock(&pm_mutex);
return error;
}
static int snapshot_release(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
mutex_lock(&pm_mutex);
swsusp_free();
free_basic_memory_bitmaps();
data = filp->private_data;
free_all_swap_pages(data->swap);
if (data->frozen) {
mutex_lock(&pm_mutex);
if (data->frozen)
thaw_processes();
mutex_unlock(&pm_mutex);
}
pm_notifier_call_chain(data->mode == O_WRONLY ?
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
mutex_unlock(&pm_mutex);
return 0;
}
@@ -134,9 +144,13 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
struct snapshot_data *data;
ssize_t res;
mutex_lock(&pm_mutex);
data = filp->private_data;
if (!data->ready)
return -ENODATA;
if (!data->ready) {
res = -ENODATA;
goto Unlock;
}
res = snapshot_read_next(&data->handle, count);
if (res > 0) {
if (copy_to_user(buf, data_of(data->handle), res))
@@ -144,6 +158,10 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
else
*offp = data->handle.offset;
}
Unlock:
mutex_unlock(&pm_mutex);
return res;
}
@@ -153,6 +171,8 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
struct snapshot_data *data;
ssize_t res;
mutex_lock(&pm_mutex);
data = filp->private_data;
res = snapshot_write_next(&data->handle, count);
if (res > 0) {
@@ -161,11 +181,14 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
else
*offp = data->handle.offset;
}
mutex_unlock(&pm_mutex);
return res;
}
static int snapshot_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
static long snapshot_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int error = 0;
struct snapshot_data *data;
@@ -179,6 +202,9 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
data = filp->private_data;
switch (cmd) {
@@ -186,7 +212,6 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
case SNAPSHOT_FREEZE:
if (data->frozen)
break;
mutex_lock(&pm_mutex);
printk("Syncing filesystems ... ");
sys_sync();
printk("done.\n");
@@ -194,7 +219,6 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = freeze_processes();
if (error)
thaw_processes();
mutex_unlock(&pm_mutex);
if (!error)
data->frozen = 1;
break;
@@ -202,9 +226,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
case SNAPSHOT_UNFREEZE:
if (!data->frozen || data->ready)
break;
mutex_lock(&pm_mutex);
thaw_processes();
mutex_unlock(&pm_mutex);
data->frozen = 0;
break;
@@ -307,16 +329,11 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EPERM;
break;
}
if (!mutex_trylock(&pm_mutex)) {
error = -EBUSY;
break;
}
/*
* Tasks are frozen and the notifiers have been called with
* PM_HIBERNATION_PREPARE
*/
error = suspend_devices_and_enter(PM_SUSPEND_MEM);
mutex_unlock(&pm_mutex);
break;
case SNAPSHOT_PLATFORM_SUPPORT:
@@ -390,6 +407,8 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
}
mutex_unlock(&pm_mutex);
return error;
}
@@ -399,7 +418,7 @@ static const struct file_operations snapshot_fops = {
.read = snapshot_read,
.write = snapshot_write,
.llseek = no_llseek,
.ioctl = snapshot_ioctl,
.unlocked_ioctl = snapshot_ioctl,
};
static struct miscdevice snapshot_device = {

37
kernel/ptrace.c
View File

@@ -33,13 +33,9 @@
*/
void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
{
BUG_ON(!list_empty(&child->ptrace_list));
if (child->parent == new_parent)
return;
list_add(&child->ptrace_list, &child->parent->ptrace_children);
remove_parent(child);
BUG_ON(!list_empty(&child->ptrace_entry));
list_add(&child->ptrace_entry, &new_parent->ptraced);
child->parent = new_parent;
add_parent(child);
}
/*
@@ -73,12 +69,8 @@ void __ptrace_unlink(struct task_struct *child)
BUG_ON(!child->ptrace);
child->ptrace = 0;
if (ptrace_reparented(child)) {
list_del_init(&child->ptrace_list);
remove_parent(child);
child->parent = child->real_parent;
add_parent(child);
}
child->parent = child->real_parent;
list_del_init(&child->ptrace_entry);
if (task_is_traced(child))
ptrace_untrace(child);
@@ -492,15 +484,34 @@ int ptrace_traceme(void)
/*
* Are we already being traced?
*/
repeat:
task_lock(current);
if (!(current->ptrace & PT_PTRACED)) {
/*
* See ptrace_attach() comments about the locking here.
*/
unsigned long flags;
if (!write_trylock_irqsave(&tasklist_lock, flags)) {
task_unlock(current);
do {
cpu_relax();
} while (!write_can_lock(&tasklist_lock));
goto repeat;
}
ret = security_ptrace(current->parent, current,
PTRACE_MODE_ATTACH);
/*
* Set the ptrace bit in the process ptrace flags.
* Then link us on our parent's ptraced list.
*/
if (!ret)
if (!ret) {
current->ptrace |= PT_PTRACED;
__ptrace_link(current, current->real_parent);
}
write_unlock_irqrestore(&tasklist_lock, flags);
}
task_unlock(current);
return ret;