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-rw-r--r--kernel/ptrace.c16
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;