[POWERPC] Don't touch PT_DTRACE in exec

The PT_DTRACE flag is meaningless and obsolete.
Don't touch it.
Signed-off-by: NRoland McGrath <roland@redhat.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/process.c

@@ -862,11 +862,6 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	flush_spe_to_thread(current);
 	error = do_execve(filename, (char __user * __user *) a1,
 			  (char __user * __user *) a2, regs);
-	if (error == 0) {
-		task_lock(current);
-		current->ptrace &= ~PT_DTRACE;
-		task_unlock(current);
-	}
 	putname(filename);
 out:
 	return error;

arch/powerpc/kernel/sys_ppc32.c

@@ -368,11 +368,6 @@ long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 
 	error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
 
-	if (error == 0) {
-		task_lock(current);
-		current->ptrace &= ~PT_DTRACE;
-		task_unlock(current);
-	}
 	putname(filename);
 
 out: