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-rw-r--r--include/linux/ftrace.h8
-rw-r--r--kernel/semaphore.c2
-rw-r--r--kernel/trace/trace.c4
-rw-r--r--kernel/trace/trace.h2
4 files changed, 13 insertions, 3 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 0d3714e7110b..017ab44d572a 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -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 */
diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 5c2942e768cd..1a064adab658 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -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--;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2824cf48cdca..3271916ff033 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -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);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f5de0601b408..c460e85e94ed 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -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];