ia64: kill thread_matches(), unexport ptrace_check_attach()

The ia64 function "thread_matches()" has no users since commit
e868a55c2a8c ("[IA64] remove find_thread_for_addr()").  Remove it.

This allows us to make ptrace_check_attach() static to kernel/ptrace.c,
which is good since we'll need to change the semantics of it and fix up
all the callers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 1 insertions, 29 deletions

diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 4265ff64219b..b7a5fffe0924 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -672,33 +672,6 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
         read_unlock(&tasklist_lock);
 }
 
-static inline int
-thread_matches (struct task_struct *thread, unsigned long addr)
-{
-        unsigned long thread_rbs_end;
-        struct pt_regs *thread_regs;
-
-        if (ptrace_check_attach(thread, 0) < 0)
-                /*
-                 * If the thread is not in an attachable state, we'll
-                 * ignore it.  The net effect is that if ADDR happens
-                 * to overlap with the portion of the thread's
-                 * register backing store that is currently residing
-                 * on the thread's kernel stack, then ptrace() may end
-                 * up accessing a stale value.  But if the thread
-                 * isn't stopped, that's a problem anyhow, so we're
-                 * doing as well as we can...
-                 */
-                return 0;
-
-        thread_regs = task_pt_regs(thread);
-        thread_rbs_end = ia64_get_user_rbs_end(thread, thread_regs, NULL);
-        if (!on_kernel_rbs(addr, thread_regs->ar_bspstore, thread_rbs_end))
-                return 0;
-
-        return 1;       /* looks like we've got a winner */
-}
-
 /*
  * Write f32-f127 back to task->thread.fph if it has been modified.
  */
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 1693775ecfe8..89573a33ab3c 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -45,7 +45,6 @@ extern long arch_ptrace(struct task_struct *child, long request,
 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 void ptrace_disable(struct task_struct *);
-extern int ptrace_check_attach(struct task_struct *task, bool ignore_state);
 extern int ptrace_request(struct task_struct *child, long request,
                           unsigned long addr, unsigned long data);
 extern void ptrace_notify(int exit_code);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1599157336a6..612a56126851 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -139,7 +139,7 @@ void __ptrace_unlink(struct task_struct *child)
  * RETURNS:
  * 0 on success, -ESRCH if %child is not ready.
  */
-int ptrace_check_attach(struct task_struct *child, bool ignore_state)
+static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
 {
         int ret = -ESRCH;