[S390] Remove self ptrace IEEE_IP hack.

The self referential PT_IEEE_IP ptrace peek & poke calls have been
broken for that last 6 years. For peek the code always returns 0
instead of the last ieee fault and for poke the code does nothing.
Since nobody noticed the code seems to be superfluous. So lets
remove it.

Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 20 deletions

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 58a064296987..9dbaef44e8ec 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -607,8 +607,6 @@ do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
 }
 #endif
 
-#define PT32_IEEE_IP 0x13c
-
 static int
 do_ptrace(struct task_struct *child, long request, long addr, long data)
 {
@@ -617,24 +615,6 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
         if (request == PTRACE_ATTACH)
                 return ptrace_attach(child);
 
-        /*
-         * Special cases to get/store the ieee instructions pointer.
-         */
-        if (child == current) {
-                if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP)
-                        return peek_user(child, addr, data);
-                if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP)
-                        return poke_user(child, addr, data);
-#ifdef CONFIG_COMPAT
-                if (request == PTRACE_PEEKUSR &&
-                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-                        return peek_user_emu31(child, addr, data);
-                if (request == PTRACE_POKEUSR &&
-                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-                        return poke_user_emu31(child, addr, data);
-#endif
-        }
-
         ret = ptrace_check_attach(child, request == PTRACE_KILL);
         if (ret < 0)
                 return ret;