static void __init do_initcalls(void)
{
initcall_t *call;
int count = preempt_count();
for (call = __initcall_start; call < __initcall_end; call++) {
ktime_t t0, t1, delta;
char *msg = NULL;
char msgbuf[40];
int result;
wbd222_wdt_touch();
if (initcall_debug) {
printk("Calling initcall 0x%p", *call);
print_fn_descriptor_symbol(": %s()",
(unsigned long) *call);
printk("\n");
t0 = ktime_get();
}
result = (*call)();
if (initcall_debug) {
t1 = ktime_get();
delta = ktime_sub(t1, t0);
printk("initcall 0x%p", *call);
print_fn_descriptor_symbol(": %s()",
(unsigned long) *call);
printk(" returned %d.\n", result);
printk("initcall 0x%p ran for %Ld msecs: ",
*call, (unsigned long long)delta.tv64 >> 20);
print_fn_descriptor_symbol("%s()\n",
(unsigned long) *call);
}
if (result && result != -ENODEV && initcall_debug) {
sprintf(msgbuf, "error code %d", result);
msg = msgbuf;
}
if (preempt_count() != count) {
msg = "preemption imbalance";
preempt_count() = count;
}
if (irqs_disabled()) {
msg = "disabled interrupts";
local_irq_enable();
}
if (msg) {
printk(KERN_WARNING "initcall at 0x%p", *call);
print_fn_descriptor_symbol(": %s()",
(unsigned long) *call);
printk(": returned with %s\n", msg);
}
}
/* Make sure there is no pending stuff from the initcall sequence */
flush_scheduled_work();
}
static void __init do_initcalls(void)
{
initcall_t *call;
int count = preempt_count();
for (call = __initcall_start; call < __initcall_end; call++) {
char *msg;
if (initcall_debug) {
printk(KERN_DEBUG "Calling initcall 0x%p", *call);
print_fn_descriptor_symbol(": %s()", (unsigned long) *call);
printk("\n");
}
(*call)();
msg = NULL;
if (preempt_count() != count) {
msg = "preemption imbalance";
preempt_count() = count;
}
if (irqs_disabled()) {
msg = "disabled interrupts";
local_irq_enable();
}
if (msg) {
printk(KERN_WARNING "error in initcall at 0x%p: "
"returned with %s\n", *call, msg);
}
}
/* Make sure there is no pending stuff from the initcall sequence */
flush_scheduled_work();
}
/*
* fixup_init is called when:
* - an active object is initialized
*/
static int rcuhead_fixup_init(void *addr, enum debug_obj_state state)
{
struct rcu_head *head = addr;
switch (state) {
case ODEBUG_STATE_ACTIVE:
/*
* Ensure that queued callbacks are all executed.
* If we detect that we are nested in a RCU read-side critical
* section, we should simply fail, otherwise we would deadlock.
<<<<<<< HEAD
* In !PREEMPT configurations, there is no way to tell if we are
* in a RCU read-side critical section or not, so we never
* attempt any fixup and just print a warning.
*/
#ifndef CONFIG_PREEMPT
WARN_ON_ONCE(1);
return 0;
#endif
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON_ONCE(1);
=======
*/
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON(1);
>>>>>>> 296c66da8a02d52243f45b80521febece5ed498a
return 0;
static void __init _do_initcalls(int count,initcall_t* strt,initcall_t* end)
{
initcall_t *call;
for(call=strt;call<end;call++)
{
char *msg;
if (initcall_debug)
{
printk(KERN_DEBUG "Calling initcall 0x%p", *call);
print_symbol(": %s()", (unsigned long) *call);
printk("\n");
}
(*call)();
msg=NULL;
if(preempt_count()!=count)
{
msg="preemption imbalance";
preempt_count()=count;
}
if(irqs_disabled())
{
msg="disabled interrupts";
local_irq_enable();
}
if(msg)
{
printk("error in initcall at 0x%p: "
"returned with %s\n",*call, msg);
}
}
}
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
{
unsigned long saved_preempt_count = preempt_count();
int expected_failure = 0;
#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_DEBUG_RT_MUTEXES)
int saved_lock_count = current->lock_count;
#endif
WARN_ON(irqs_disabled());
testcase_fn();
/*
* Filter out expected failures:
*/
#ifndef CONFIG_PROVE_LOCKING
if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected)
expected_failure = 1;
if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected)
expected_failure = 1;
if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected)
expected_failure = 1;
if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected)
expected_failure = 1;
#endif
if (debug_locks != expected) {
if (expected_failure) {
expected_testcase_failures++;
printk("failed|");
} else {
unexpected_testcase_failures++;
printk("FAILED|");
dump_stack();
}
} else {
testcase_successes++;
printk(" ok |");
}
testcase_total++;
if (debug_locks_verbose)
printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
lockclass_mask, debug_locks, expected);
/*
* Some tests (e.g. double-unlock) might corrupt the preemption
* count, so restore it:
*/
preempt_count() = saved_preempt_count;
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
else
current->softirqs_enabled = 1;
#endif
reset_locks();
#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_DEBUG_RT_MUTEXES)
current->lock_count = saved_lock_count;
#endif
}
static void __init do_one_initcall(initcall_t fn)
{
int count = preempt_count();
int result;
if (initcall_debug)
result = do_one_initcall_debug(fn);
else
result = fn();
msgbuf[0] = 0;
if (result && result != -ENODEV && initcall_debug)
sprintf(msgbuf, "error code %d ", result);
if (preempt_count() != count) {
strncat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
preempt_count() = count;
}
if (irqs_disabled()) {
strncat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
local_irq_enable();
}
if (msgbuf[0]) {
print_fn_descriptor_symbol(KERN_WARNING "initcall %s", fn);
printk(" returned with %s\n", msgbuf);
}
}
static void __local_bh_disable(unsigned long ip, unsigned int cnt)
{
unsigned long flags;
WARN_ON_ONCE(in_irq());
raw_local_irq_save(flags);
/*
* The preempt tracer hooks into add_preempt_count and will break
* lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
* is set and before current->softirq_enabled is cleared.
* We must manually increment preempt_count here and manually
* call the trace_preempt_off later.
*/
preempt_count() += cnt;
/*
* Were softirqs turned off above:
*/
if (softirq_count() == cnt)
trace_softirqs_off(ip);
raw_local_irq_restore(flags);
if (preempt_count() == cnt)
trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
}
static int test_init(void)
{
int ret;
int cpu;
printk(KERN_INFO "[init] Can you feel me?\n");
ret = preempt_count();
pr_info("ret = %d\n", ret);
preempt_disable();
ret = preempt_count();
pr_info("ret = %d\n", ret);
preempt_enable();
ret = preempt_count();
pr_info("ret = %d\n", ret);
cpu = get_cpu();
pr_info("cpu = %d\n", cpu);
put_cpu();
return 0;
}
static void __init do_initcalls(void)
{
initcall_t *call;
int count = preempt_count();
for (call = __initcall_start; call < __initcall_end; call++) {
char *msg = NULL;
char msgbuf[40];
int result;
if (initcall_debug) {
printk("Calling initcall 0x%p", *call);
print_fn_descriptor_symbol(": %s()",
(unsigned long) *call);
printk("\n");
}
result = (*call)();
if (result && result != -ENODEV && initcall_debug) {
sprintf(msgbuf, "error code %d", result);
msg = msgbuf;
}
if (preempt_count() != count) {
msg = "preemption imbalance";
preempt_count() = count;
}
if (irqs_disabled()) {
msg = "disabled interrupts";
local_irq_enable();
}
#ifdef CONFIG_PREEMPT_RT
if (irqs_disabled()) {
msg = "disabled hard interrupts";
local_irq_enable();
}
#endif
if (msg) {
printk(KERN_WARNING "initcall at 0x%p", *call);
print_fn_descriptor_symbol(": %s()",
(unsigned long) *call);
printk(": returned with %s\n", msg);
}
}
/* Make sure there is no pending stuff from the initcall sequence */
flush_scheduled_work();
}
/*
* fixup_free is called when:
* - an active object is freed
*/
static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
{
struct rcu_head *head = addr;
switch (state) {
case ODEBUG_STATE_ACTIVE:
/*
* Ensure that queued callbacks are all executed.
* If we detect that we are nested in a RCU read-side critical
* section, we should simply fail, otherwise we would deadlock.
* In !PREEMPT configurations, there is no way to tell if we are
* in a RCU read-side critical section or not, so we never
* attempt any fixup and just print a warning.
*/
#ifndef CONFIG_PREEMPT
WARN_ON_ONCE(1);
return 0;
#endif
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON_ONCE(1);
return 0;
}
rcu_barrier();
rcu_barrier_sched();
rcu_barrier_bh();
debug_object_free(head, &rcuhead_debug_descr);
return 1;
default:
return 0;
}
}
static void
probe_sched_wakeup(void *ignore, struct task_struct *wakee, int success)
{
struct trace_array_cpu *data;
unsigned long flags;
int cpu, pc;
if (unlikely(!sched_ref))
return;
tracing_record_cmdline(current);
if (!tracer_enabled || sched_stopped)
return;
pc = preempt_count();
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = ctx_trace->data[cpu];
if (likely(!atomic_read(&data->disabled)))
tracing_sched_wakeup_trace(ctx_trace, wakee, current,
flags, pc);
local_irq_restore(flags);
}
/*
* irqsoff uses its own tracer function to keep the overhead down:
*/
static void
irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = irqsoff_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
/*
* Does not matter if we preempt. We test the flags
* afterward, to see if irqs are disabled or not.
* If we preempt and get a false positive, the flags
* test will fail.
*/
cpu = raw_smp_processor_id();
if (likely(!per_cpu(tracing_cpu, cpu)))
return;
local_save_flags(flags);
/* slight chance to get a false positive on tracing_cpu */
if (!irqs_disabled_flags(flags))
return;
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
trace_function(tr, ip, parent_ip, flags, preempt_count());
atomic_dec(&data->disabled);
}
static void inline procfile_context_print(void)
{
printk_d("preemptible 0x%x\n", preemptible());
printk_d("in_atomic_preempt_off 0x%x\n", in_atomic_preempt_off());
printk_d("in_atomic 0x%x\n", in_atomic());
printk_d("in_nmi 0x%lx\n", in_nmi());
printk_d("in_serving_softirq 0x%lx\n", in_serving_softirq());
printk_d("in_interrupt 0x%lx\n", in_interrupt());
printk_d("in_softirq 0x%lx\n", in_softirq());
printk_d("in_irq 0x%lx\n", in_irq());
printk_d("preempt_count 0x%x\n", preempt_count());
printk_d("irqs_disabled 0x%x\n", irqs_disabled());
if(current) {
printk_d("task->comm %s\n", current->comm);
printk_d("task->flags 0x%x\n", current->flags);
printk_d("task->state %lu\n", current->state);
printk_d("task->usage %d\n", atomic_read(&(current->usage)));
printk_d("task->prio %d\n", current->prio);
printk_d("task->static_prio %d\n", current->static_prio);
printk_d("task->normal_prio %d\n", current->normal_prio);
printk_d("task->rt_priority %d\n", current->rt_priority);
printk_d("task->policy %d\n", current->policy);
printk_d("task->pid %d\n", current->pid);
printk_d("task->tgid %d\n", current->tgid);
}
else
printk_d("task pointer NULL\n");
}
/* leave me here to see if it catches a weird crash */
static void ramster_check_irq_counts(void)
{
static int last_hardirq_cnt, last_softirq_cnt, last_preempt_cnt;
int cur_hardirq_cnt, cur_softirq_cnt, cur_preempt_cnt;
cur_hardirq_cnt = hardirq_count() >> HARDIRQ_SHIFT;
if (cur_hardirq_cnt > last_hardirq_cnt) {
last_hardirq_cnt = cur_hardirq_cnt;
if (!(last_hardirq_cnt&(last_hardirq_cnt-1)))
pr_err("RAMSTER TESTING RRP hardirq_count=%d\n",
last_hardirq_cnt);
}
cur_softirq_cnt = softirq_count() >> SOFTIRQ_SHIFT;
if (cur_softirq_cnt > last_softirq_cnt) {
last_softirq_cnt = cur_softirq_cnt;
if (!(last_softirq_cnt&(last_softirq_cnt-1)))
pr_err("RAMSTER TESTING RRP softirq_count=%d\n",
last_softirq_cnt);
}
cur_preempt_cnt = preempt_count() & PREEMPT_MASK;
if (cur_preempt_cnt > last_preempt_cnt) {
last_preempt_cnt = cur_preempt_cnt;
if (!(last_preempt_cnt&(last_preempt_cnt-1)))
pr_err("RAMSTER TESTING RRP preempt_count=%d\n",
last_preempt_cnt);
}
}
static inline void
stop_critical_timing(unsigned long ip, unsigned long parent_ip)
{
int cpu;
struct trace_array *tr = irqsoff_trace;
struct trace_array_cpu *data;
unsigned long flags;
cpu = raw_smp_processor_id();
/* Always clear the tracing cpu on stopping the trace */
if (unlikely(per_cpu(tracing_cpu, cpu)))
per_cpu(tracing_cpu, cpu) = 0;
else
return;
if (!tracer_enabled)
return;
data = tr->data[cpu];
if (unlikely(!data) ||
!data->critical_start || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
local_save_flags(flags);
trace_function(tr, ip, parent_ip, flags, preempt_count());
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
data->critical_start = 0;
atomic_dec(&data->disabled);
}
static void
function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = func_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
pc = preempt_count();
trace_function(tr, ip, parent_ip, flags, pc);
__trace_stack(tr, flags, 5, pc);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
/* Kretprobe handler */
static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
struct kretprobe_trace_entry *entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
int size, i, pc;
unsigned long irq_flags;
struct ftrace_event_call *call = &tp->call;
local_save_flags(irq_flags);
pc = preempt_count();
size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
irq_flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
entry->nargs = tp->nr_args;
entry->func = (unsigned long)tp->rp.kp.addr;
entry->ret_ip = (unsigned long)ri->ret_addr;
for (i = 0; i < tp->nr_args; i++)
entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
if (!filter_current_check_discard(buffer, call, entry, event))
trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
}
static void
function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = func_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
pc = preempt_count();
preempt_disable_notrace();
local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
trace_function(tr, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
preempt_enable_notrace();
}
static void
probe_mt65xx_mon_tracepoint(void *ignore, struct task_struct *prev, struct task_struct *next)
{
struct trace_array_cpu *data;
unsigned long flags;
int cpu;
int pc;
if (unlikely(!mt65xx_mon_ref))
return;
if (!mt65xx_mon_enabled || mt65xx_mon_stopped)
return;
if (prev)
tracing_record_cmdline(prev);
if (next)
tracing_record_cmdline(next);
tracing_record_cmdline(current);
pc = preempt_count();
//local_irq_save(flags);
spin_lock_irqsave(&mt65xx_mon_spinlock, flags);
cpu = raw_smp_processor_id();
data = mt65xx_mon_trace->data[cpu];
if (likely(!atomic_read(&data->disabled)))
tracing_mt65xx_mon_function(mt65xx_mon_trace, prev, next, flags, pc);
spin_unlock_irqrestore(&mt65xx_mon_spinlock, flags);
//local_irq_restore(flags);
}
/*
* fixup_free is called when:
* - an active object is freed
*/
static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
{
struct rcu_head *head = addr;
switch (state) {
case ODEBUG_STATE_ACTIVE:
/*
* Ensure that queued callbacks are all executed.
* If we detect that we are nested in a RCU read-side critical
* section, we should simply fail, otherwise we would deadlock.
*/
#ifndef CONFIG_PREEMPT
WARN_ON(1);
return 0;
#else
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON(1);
return 0;
}
rcu_barrier();
rcu_barrier_sched();
rcu_barrier_bh();
debug_object_free(head, &rcuhead_debug_descr);
return 1;
#endif
default:
return 0;
}
}
/*
* fixup_activate is called when:
* - an active object is activated
* - an unknown object is activated (might be a statically initialized object)
* Activation is performed internally by call_rcu().
*/
static int rcuhead_fixup_activate(void *addr, enum debug_obj_state state)
{
struct rcu_head *head = addr;
switch (state) {
case ODEBUG_STATE_NOTAVAILABLE:
/*
* This is not really a fixup. We just make sure that it is
* tracked in the object tracker.
*/
debug_object_init(head, &rcuhead_debug_descr);
debug_object_activate(head, &rcuhead_debug_descr);
return 0;
case ODEBUG_STATE_ACTIVE:
/*
* Ensure that queued callbacks are all executed.
* If we detect that we are nested in a RCU read-side critical
* section, we should simply fail, otherwise we would deadlock.
*/
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON(1);
return 0;
}
rcu_barrier();
rcu_barrier_sched();
rcu_barrier_bh();
debug_object_activate(head, &rcuhead_debug_descr);
return 1;
default:
return 0;
}
}
static void
probe_wakeup(struct rq *rq, struct task_struct *p, int success)
{
struct trace_array_cpu *data;
int cpu = smp_processor_id();
unsigned long flags;
long disabled;
int pc;
if (likely(!tracer_enabled))
return;
tracing_record_cmdline(p);
tracing_record_cmdline(current);
if ((wakeup_rt && !rt_task(p)) ||
p->prio >= wakeup_prio ||
p->prio >= current->prio)
return;
pc = preempt_count();
disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
if (unlikely(disabled != 1))
goto out;
/* interrupts should be off from try_to_wake_up */
__raw_spin_lock(&wakeup_lock);
/* check for races. */
if (!tracer_enabled || p->prio >= wakeup_prio)
goto out_locked;
/* reset the trace */
__wakeup_reset(wakeup_trace);
wakeup_cpu = task_cpu(p);
wakeup_current_cpu = wakeup_cpu;
wakeup_prio = p->prio;
wakeup_task = p;
get_task_struct(wakeup_task);
local_save_flags(flags);
data = wakeup_trace->data[wakeup_cpu];
data->preempt_timestamp = ftrace_now(cpu);
tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc);
/*
* We must be careful in using CALLER_ADDR2. But since wake_up
* is not called by an assembly function (where as schedule is)
* it should be safe to use it here.
*/
trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
out_locked:
__raw_spin_unlock(&wakeup_lock);
out:
atomic_dec(&wakeup_trace->data[cpu]->disabled);
}
static void
probe_sched_switch(void *ignore, struct task_struct *prev, struct task_struct *next)
{
struct trace_array_cpu *data;
unsigned long flags;
int cpu;
int pc;
if (unlikely(!sched_ref))
return;
tracing_record_cmdline(prev);
tracing_record_cmdline(next);
if (!tracer_enabled || sched_stopped)
return;
pc = preempt_count();
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = ctx_trace->data[cpu];
if (likely(!atomic_read(&data->disabled)))
tracing_sched_switch_trace(ctx_trace, prev, next, flags, pc);
local_irq_restore(flags);
}
static void
probe_mt65xx_mon_tracepoint(void *ignore, struct task_struct *prev, struct task_struct *next)
{
struct trace_array_cpu *data;
unsigned long flags;
int cpu;
int pc;
if (unlikely(!mt65xx_mon_ref))
return;
if (!mt65xx_mon_enabled || mt65xx_mon_stopped)
return;
if (prev)
tracing_record_cmdline(prev);
if (next)
tracing_record_cmdline(next);
tracing_record_cmdline(current);
pc = preempt_count();
/* local_irq_save(flags); */
spin_lock_irqsave(&mt65xx_mon_spinlock, flags);
cpu = raw_smp_processor_id();
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
data = mt65xx_mon_trace->data[cpu];
#else
data = per_cpu_ptr(mt65xx_mon_trace->trace_buffer.data, cpu);
#endif
if (likely(!atomic_read(&data->disabled)))
tracing_mt65xx_mon_function(mt65xx_mon_trace, prev, next, flags, pc);
spin_unlock_irqrestore(&mt65xx_mon_spinlock, flags);
/* local_irq_restore(flags); */
}
/*
* Do the printing; return non-zero if the task should be rescheduled.
*/
static int jiq_print(void *ptr)
{
struct clientdata *data = ptr;
int len = data->len;
char *buf = data->buf;
unsigned long j = jiffies;
if (len > LIMIT) {
wake_up_interruptible(&jiq_wait);
return 0;
}
if (len == 0)
len = sprintf(buf," time delta preempt pid cpu command\n");
else
len =0;
/* intr_count is only exported since 1.3.5, but 1.99.4 is needed anyways */
len += sprintf(buf+len, "%9li %4li %3i %5i %3i %s\n",
j, j - data->jiffies,
preempt_count(), current->pid, smp_processor_id(),
current->comm);
data->len += len;
data->buf += len;
data->jiffies = j;
return 1;
}
static inline void
start_critical_timing(unsigned long ip, unsigned long parent_ip)
{
int cpu;
struct trace_array *tr = irqsoff_trace;
struct trace_array_cpu *data;
unsigned long flags;
if (likely(!tracer_enabled))
return;
cpu = raw_smp_processor_id();
if (per_cpu(tracing_cpu, cpu))
return;
data = tr->data[cpu];
if (unlikely(!data) || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
data->critical_sequence = max_sequence;
data->preempt_timestamp = ftrace_now(cpu);
data->critical_start = parent_ip ? : ip;
local_save_flags(flags);
trace_function(tr, ip, parent_ip, flags, preempt_count());
per_cpu(tracing_cpu, cpu) = 1;
atomic_dec(&data->disabled);
}
static inline void __lock_kernel(void)
{
preempt_disable();
if (unlikely(!_raw_spin_trylock(&kernel_flag))) {
/*
* If preemption was disabled even before this
* was called, there's nothing we can be polite
* about - just spin.
*/
if (preempt_count() > 1) {
_raw_spin_lock(&kernel_flag);
return;
}
/*
* Otherwise, let's wait for the kernel lock
* with preemption enabled..
*/
do {
preempt_enable();
while (spin_is_locked(&kernel_flag))
cpu_relax();
preempt_disable();
} while (!_raw_spin_trylock(&kernel_flag));
}
}
void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
{
unsigned long flags;
WARN_ON_ONCE(in_irq());
raw_local_irq_save(flags);
/*
* The preempt tracer hooks into preempt_count_add and will break
* lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
* is set and before current->softirq_enabled is cleared.
* We must manually increment preempt_count here and manually
* call the trace_preempt_off later.
*/
__preempt_count_add(cnt);
/*
* Were softirqs turned off above:
*/
if (softirq_count() == (cnt & SOFTIRQ_MASK))
trace_softirqs_off(ip);
raw_local_irq_restore(flags);
if (preempt_count() == cnt) {
#ifdef CONFIG_DEBUG_PREEMPT
current->preempt_disable_ip = get_lock_parent_ip();
#endif
trace_preempt_off(CALLER_ADDR0, get_lock_parent_ip());
}
}
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = func_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
/*
* Need to use raw, since this must be called before the
* recursive protection is performed.
*/
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
pc = preempt_count();
trace_function(tr, ip, parent_ip, flags, pc);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
{
#ifdef CONFIG_PREEMPT
Assert(hThread == NIL_RTTHREAD);
# ifdef preemptible
return preemptible();
# else
return preempt_count() == 0 && !in_atomic() && !irqs_disabled();
# endif
#else
int32_t c;
Assert(hThread == NIL_RTTHREAD);
c = g_acPreemptDisabled[smp_processor_id()];
AssertMsg(c >= 0 && c < 32, ("%d\n", c));
if (c != 0)
return false;
# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 32)
if (in_atomic())
return false;
# endif
# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 28)
if (irqs_disabled())
return false;
# else
if (!ASMIntAreEnabled())
return false;
# endif
return true;
#endif
}