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ftrace: stacktrace fix

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Ingo Molnar 17 anos atrás
pai
commit
74f4e369fc
4 arquivos alterados com 13 adições e 3 exclusões
  1. 8 0
      include/linux/ftrace.h
  2. 2 0
      kernel/semaphore.c
  3. 2 2
      kernel/trace/trace.c
  4. 1 1
      kernel/trace/trace.h

+ 8 - 0
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 */

+ 2 - 0
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--;

+ 2 - 2
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);
 

+ 1 - 1
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];