1 files changed, 3 insertions, 13 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 38fdfea1a15a..a64fe75a48ba 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -581,26 +581,16 @@ int ptrace_request(struct task_struct *child, long request,
         return ret;
 }
 
-/**
- * ptrace_get_task_struct  --  grab a task struct reference for ptrace
- * @pid:       process id to grab a task_struct reference of
- *
- * This function is a helper for ptrace implementations.  It checks
- * permissions and then grabs a task struct for use of the actual
- * ptrace implementation.
- *
- * Returns the task_struct for @pid or an ERR_PTR() on failure.
- */
-struct task_struct *ptrace_get_task_struct(pid_t pid)
+static struct task_struct *ptrace_get_task_struct(pid_t pid)
 {
         struct task_struct *child;
 
-        read_lock(&tasklist_lock);
+        rcu_read_lock();
         child = find_task_by_vpid(pid);
         if (child)
                 get_task_struct(child);
+        rcu_read_unlock();
 
-        read_unlock(&tasklist_lock);
         if (!child)
                 return ERR_PTR(-ESRCH);
         return child;