void local_bh_enable(void)
{
#ifdef CONFIG_TRACE_IRQFLAGS
unsigned long flags;
WARN_ON_ONCE(in_irq());
#endif
WARN_ON_ONCE(irqs_disabled());
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_save(flags);
#endif
/*
* Are softirqs going to be turned on now:
*/
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_on((unsigned long)__builtin_return_address(0));
/*
* Keep preemption disabled until we are done with
* softirq processing:
*/
sub_preempt_count(SOFTIRQ_OFFSET - 1);
if (unlikely(!in_interrupt() && local_softirq_pending()))
do_softirq();
dec_preempt_count();
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_restore(flags);
#endif
preempt_check_resched();
}
void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
{
WARN_ON_ONCE(in_irq() || irqs_disabled());
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_disable();
#endif
/*
* Are softirqs going to be turned on now:
*/
if (softirq_count() == SOFTIRQ_DISABLE_OFFSET)
trace_softirqs_on(ip);
/*
* Keep preemption disabled until we are done with
* softirq processing:
*/
preempt_count_sub(cnt - 1);
if (unlikely(!in_interrupt() && local_softirq_pending())) {
/*
* Run softirq if any pending. And do it in its own stack
* as we may be calling this deep in a task call stack already.
*/
do_softirq();
}
preempt_count_dec();
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_enable();
#endif
preempt_check_resched();
}
/* 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);
}
}
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 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 inline void _local_bh_enable_ip(unsigned long ip)
{
WARN_ON_ONCE(in_irq() || irqs_disabled());
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_disable();
#endif
/*
* Are softirqs going to be turned on now:
*/
if (softirq_count() == SOFTIRQ_DISABLE_OFFSET)
trace_softirqs_on(ip);
/*
* Keep preemption disabled until we are done with
* softirq processing:
*/
sub_preempt_count(SOFTIRQ_DISABLE_OFFSET - 1);
if (unlikely(!in_interrupt() && local_softirq_pending()))
do_softirq();
dec_preempt_count();
#ifdef CONFIG_TRACE_IRQFLAGS
local_irq_enable();
#endif
preempt_check_resched();
}
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.
*/
add_preempt_count_notrace(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 void __local_bh_enable(unsigned int cnt)
{
WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == (cnt & SOFTIRQ_MASK))
trace_softirqs_on(_RET_IP_);
preempt_count_sub(cnt);
}
/*
* Special-case - softirqs can safely be enabled in
* cond_resched_softirq(), or by __do_softirq(),
* without processing still-pending softirqs:
*/
void _local_bh_enable(void)
{
WARN_ON_ONCE(in_irq());
WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_on((unsigned long)__builtin_return_address(0));
sub_preempt_count(SOFTIRQ_OFFSET);
}
static void __local_bh_enable(unsigned int cnt)
{
WARN_ON_ONCE(in_irq());
WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == cnt)
trace_softirqs_on(_RET_IP_);
sub_preempt_count(cnt);
}
static void __local_bh_enable(unsigned int cnt)
{
WARN_ON_ONCE(in_irq());
WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == cnt)
trace_softirqs_on((unsigned long)__builtin_return_address(0));
sub_preempt_count(cnt);
}
/*
* Special-case - softirqs can safely be enabled in
* cond_resched_softirq(), or by __do_softirq(),
* without processing still-pending softirqs:
*/
void _local_bh_enable(void)
{
#ifdef CONFIG_TRACE_IRQFLAGS
WARN_ON_ONCE(in_irq());
#endif
WARN_ON_ONCE(!irqs_disabled());
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_on((unsigned long)__builtin_return_address(0));
sub_preempt_count(SOFTIRQ_OFFSET);
}
void __local_bh_enable(void)
{
WARN_ON_ONCE(in_irq());
/*
* softirqs should never be enabled by __local_bh_enable(),
* it always nests inside local_bh_enable() sections:
*/
WARN_ON_ONCE(softirq_count() == SOFTIRQ_OFFSET);
sub_preempt_count(SOFTIRQ_OFFSET);
}
static void __local_bh_disable(unsigned long ip)
{
unsigned long flags;
WARN_ON_ONCE(in_irq());
raw_local_irq_save(flags);
add_preempt_count(SOFTIRQ_OFFSET);
/*
* Were softirqs turned off above:
*/
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_off(ip);
raw_local_irq_restore(flags);
}
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
{
unsigned long saved_preempt_count = preempt_count();
int expected_failure = 0;
WARN_ON(irqs_disabled());
testcase_fn();
#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);
preempt_count() = saved_preempt_count;
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
else
current->softirqs_enabled = 1;
#endif
reset_locks();
}
asmlinkage void do_softirq(void)
{
__u32 pending;
unsigned long flags;
if (in_interrupt())
return;
local_irq_save(flags);
pending = local_softirq_pending();
/* Switch to interrupt stack */
if (pending) {
call_softirq();
WARN_ON_ONCE(softirq_count());
}
local_irq_restore(flags);
}
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
{
unsigned long saved_preempt_count = preempt_count();
WARN_ON(irqs_disabled());
testcase_fn();
/*
* Filter out expected failures:
*/
#ifndef CONFIG_PROVE_LOCKING
if (expected == FAILURE && debug_locks) {
expected_testcase_failures++;
pr_cont("failed|");
}
else
#endif
if (debug_locks != expected) {
unexpected_testcase_failures++;
pr_cont("FAILED|");
dump_stack();
} else {
testcase_successes++;
pr_cont(" ok |");
}
testcase_total++;
if (debug_locks_verbose)
pr_cont(" 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_set(saved_preempt_count);
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
else
current->softirqs_enabled = 1;
#endif
reset_locks();
}