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ftrace: stacktrace fix

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:21:15 +02:00 committed by Thomas Gleixner
parent 5b82a1b08a
commit 74f4e369fc
4 changed files with 13 additions and 3 deletions
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8
include/linux/ftrace.h
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@ -120,4 +120,12 @@ static inline void tracer_disable(void)
# define trace_preempt_off(a0, a1) do { } while (0)
#endif
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
extern void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
#else
static inline void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
#endif
#endif /* _LINUX_FTRACE_H */

2
kernel/semaphore.c
View file

@ -31,6 +31,7 @@
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/ftrace.h>
static noinline void __down(struct semaphore *sem);
static noinline int __down_interruptible(struct semaphore *sem);
@ -53,6 +54,7 @@ void down(struct semaphore *sem)
{
unsigned long flags;
ftrace_special(sem->count, 0, __LINE__);
spin_lock_irqsave(&sem->lock, flags);
if (likely(sem->count > 0))
sem->count--;

4
kernel/trace/trace.c
View file

@ -901,7 +901,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
entry->ctx.next_pid = next->pid;
entry->ctx.next_prio = next->prio;
entry->ctx.next_state = next->state;
__trace_stack(tr, data, flags, 4);
__trace_stack(tr, data, flags, 5);
__raw_spin_unlock(&data->lock);
raw_local_irq_restore(irq_flags);
}
@ -927,7 +927,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
entry->ctx.next_pid = wakee->pid;
entry->ctx.next_prio = wakee->prio;
entry->ctx.next_state = wakee->state;
__trace_stack(tr, data, flags, 5);
__trace_stack(tr, data, flags, 6);
__raw_spin_unlock(&data->lock);
raw_local_irq_restore(irq_flags);

2
kernel/trace/trace.h
View file

@ -51,7 +51,7 @@ struct special_entry {
* Stack-trace entry:
*/
#define FTRACE_STACK_ENTRIES 5
#define FTRACE_STACK_ENTRIES 8
struct stack_entry {
unsigned long caller[FTRACE_STACK_ENTRIES];