[PATCH 59] don't use task_struct->ptrace_message

[Oleg Nesterov]

task_struct->ptrace_message is no longer needed.

I wonder why compat_ptrace_request() does "(compat_ulong_t)ptrace_message",
put_user(x, ptr) uses __typeof__(*ptr).

---

 kernel/ptrace.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- PU/kernel/ptrace.c~59_NO_PTRACE_MESSAGE     2009-10-02 23:34:57.000000000 
+0200
+++ PU/kernel/ptrace.c  2009-10-02 23:44:02.000000000 +0200
@@ -824,7 +824,6 @@ static int ptrace_setsiginfo(struct utra
 static void do_ptrace_notify_stop(struct ptrace_context *context,
                                        struct task_struct *tracee)
 {
-       tracee->ptrace_message = context->ev_mesg;
        tracee->exit_code = context->ev_code;
 
        // XXX: for debug only
@@ -1006,7 +1005,8 @@ int ptrace_request(struct task_struct *c
                ret = ptrace_set_options(engine, child, data);
                break;
        case PTRACE_GETEVENTMSG:
-               ret = put_user(child->ptrace_message, (unsigned long __user *) 
data);
+               ret = put_user(ptrace_context(engine)->ev_mesg,
+                               (unsigned long __user *) data);
                break;
 
        case PTRACE_GETSIGINFO:
@@ -1174,7 +1174,8 @@ int compat_ptrace_request(struct task_st
                break;
 
        case PTRACE_GETEVENTMSG:
-               ret = put_user((compat_ulong_t) child->ptrace_message, datap);
+               ret = put_user((compat_ulong_t)ptrace_context(engine)->ev_mesg,
+                               datap);
                break;
 
        case PTRACE_GETSIGINFO: