Revert:

commit e3e89cc535223433a619d0969db3fa05cdd946b8

("Mark ptrace_{traceme,attach,detach} static")

--- b/include/linux/ptrace.h

+++ a/include/linux/ptrace.h

@@ -102,8 +102,11 @@

 extern long arch_ptrace(struct task_struct *child, long request,

 			unsigned long addr, unsigned long data);

+extern int ptrace_traceme(void);

 extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);

 extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);

+extern int ptrace_attach(struct task_struct *tsk);

+extern int ptrace_detach(struct task_struct *, unsigned int);

 extern void ptrace_disable(struct task_struct *);

 extern int ptrace_check_attach(struct task_struct *task, int kill);

 extern int ptrace_request(struct task_struct *child, long request,

--- b/kernel/ptrace.c

+++ a/kernel/ptrace.c

@@ -163,7 +163,7 @@

 	return !err;

 }

+int ptrace_attach(struct task_struct *task)

-static int ptrace_attach(struct task_struct *task)

 {

 	int retval;

@@ -219,7 +219,7 @@

  * Performs checks and sets PT_PTRACED.

  * Should be used by all ptrace implementations for PTRACE_TRACEME.

  */

+int ptrace_traceme(void)

-static int ptrace_traceme(void)

 {

 	int ret = -EPERM;

@@ -293,7 +293,7 @@

 	return false;

 }

+int ptrace_detach(struct task_struct *child, unsigned int data)

-static int ptrace_detach(struct task_struct *child, unsigned int data)

 {

 	bool dead = false;