diff options
| -rw-r--r-- | arch/x86/kernel/ftrace.c | 43 |
1 files changed, 5 insertions, 38 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 16a571dea2e..1db0e121a3e 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -44,62 +44,37 @@ void ftrace_nmi_exit(void) atomic_dec(&in_nmi); } -/* - * Synchronize accesses to return adresses stack with - * interrupts. - */ -static raw_spinlock_t ret_stack_lock; - /* Add a function return address to the trace stack on thread info.*/ static int push_return_trace(unsigned long ret, unsigned long long time, unsigned long func) { int index; - struct thread_info *ti; - unsigned long flags; - int err = 0; - - raw_local_irq_save(flags); - __raw_spin_lock(&ret_stack_lock); + struct thread_info *ti = current_thread_info(); - ti = current_thread_info(); /* The return trace stack is full */ - if (ti->curr_ret_stack == FTRACE_RET_STACK_SIZE - 1) { - err = -EBUSY; - goto out; - } + if (ti->curr_ret_stack == FTRACE_RET_STACK_SIZE - 1) + return -EBUSY; index = ++ti->curr_ret_stack; ti->ret_stack[index].ret = ret; ti->ret_stack[index].func = func; ti->ret_stack[index].calltime = time; -out: - __raw_spin_unlock(&ret_stack_lock); - raw_local_irq_restore(flags); - return err; + return 0; } /* Retrieve a function return address to the trace stack on thread info.*/ static void pop_return_trace(unsigned long *ret, unsigned long long *time, unsigned long *func) { - struct thread_info *ti; int index; - unsigned long flags; - - raw_local_irq_save(flags); - __raw_spin_lock(&ret_stack_lock); - ti = current_thread_info(); + struct thread_info *ti = current_thread_info(); index = ti->curr_ret_stack; *ret = ti->ret_stack[index].ret; *func = ti->ret_stack[index].func; *time = ti->ret_stack[index].calltime; ti->curr_ret_stack--; - - __raw_spin_unlock(&ret_stack_lock); - raw_local_irq_restore(flags); } /* @@ -175,14 +150,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) *parent = old; } -static int __init init_ftrace_function_return(void) -{ - ret_stack_lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; - return 0; -} -device_initcall(init_ftrace_function_return); - - #endif #ifdef CONFIG_DYNAMIC_FTRACE |