ftrace: only have ftrace_kill atomic

When an anomaly is detected, we need a way to completely disable
ftrace. Right now we have two functions: ftrace_kill and ftrace_kill_atomic.
The ftrace_kill tries to do it in a "nice" way by converting everything
back to a nop.

The "nice" way is dangerous itself, so this patch removes it and only
has the "atomic" version, which is all that is needed.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 3 insertions, 41 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index b2de8de77356..93245ae046e1 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1549,22 +1549,6 @@ int ftrace_force_update(void)
         return ret;
 }
 
-static void ftrace_force_shutdown(void)
-{
-        struct task_struct *task;
-        int command = FTRACE_DISABLE_CALLS | FTRACE_UPDATE_TRACE_FUNC;
-
-        mutex_lock(&ftraced_lock);
-        task = ftraced_task;
-        ftraced_task = NULL;
-        ftraced_suspend = -1;
-        ftrace_run_update_code(command);
-        mutex_unlock(&ftraced_lock);
-
-        if (task)
-                kthread_stop(task);
-}
-
 static __init int ftrace_init_debugfs(void)
 {
         struct dentry *d_tracer;
@@ -1795,17 +1779,16 @@ core_initcall(ftrace_dynamic_init);
 # define ftrace_shutdown()              do { } while (0)
 # define ftrace_startup_sysctl()        do { } while (0)
 # define ftrace_shutdown_sysctl()       do { } while (0)
-# define ftrace_force_shutdown()        do { } while (0)
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
 /**
- * ftrace_kill_atomic - kill ftrace from critical sections
+ * ftrace_kill - kill ftrace
  *
  * This function should be used by panic code. It stops ftrace
  * but in a not so nice way. If you need to simply kill ftrace
  * from a non-atomic section, use ftrace_kill.
  */
-void ftrace_kill_atomic(void)
+void ftrace_kill(void)
 {
         ftrace_disabled = 1;
         ftrace_enabled = 0;
@@ -1816,27 +1799,6 @@ void ftrace_kill_atomic(void)
 }
 
 /**
- * ftrace_kill - totally shutdown ftrace
- *
- * This is a safety measure. If something was detected that seems
- * wrong, calling this function will keep ftrace from doing
- * any more modifications, and updates.
- * used when something went wrong.
- */
-void ftrace_kill(void)
-{
-        mutex_lock(&ftrace_sysctl_lock);
-        ftrace_disabled = 1;
-        ftrace_enabled = 0;
-
-        clear_ftrace_function();
-        mutex_unlock(&ftrace_sysctl_lock);
-
-        /* Try to totally disable ftrace */
-        ftrace_force_shutdown();
-}
-
-/**
  * register_ftrace_function - register a function for profiling
  * @ops - ops structure that holds the function for profiling.
  *
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index aeb2f2505bc5..333a5162149b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3097,7 +3097,7 @@ void ftrace_dump(void)
         dump_ran = 1;
 
         /* No turning back! */
-        ftrace_kill_atomic();
+        ftrace_kill();
 
         for_each_tracing_cpu(cpu) {
                 atomic_inc(&global_trace.data[cpu]->disabled);