Trivial. Pick the new "random" value to use it instead of PT_PTRACED.
We need this old or new bit only to make sure task_ptrace() != 0.
This allows us to simplify/lessen the first patch(es) we are going
to send to lkml, because now we can drop some of unnecessary changes
outside of ptrace.c.
See the next patch as an example.
---
kernel/ptrace.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- PU/kernel/ptrace.c~112_PT_UTRACED 2009-10-21 19:43:59.000000000 +0200
+++ PU/kernel/ptrace.c 2009-10-21 19:57:49.000000000 +0200
@@ -36,6 +36,8 @@ struct ptrace_context {
enum utrace_resume_action resume;
};
+#define PT_UTRACED 0x00001000
+
#define PTRACE_O_SYSEMU 0x100
#define PTRACE_EVENT_SYSCALL_ENTRY (1 << 16)
@@ -518,7 +520,7 @@ static int ptrace_attach_task(struct tas
return PTR_ERR(engine);
/*
* It can fail only if the tracee is dead, the caller
- * must notice this before setting PT_PTRACED.
+ * must notice this before setting PT_UTRACED.
*/
err = __ptrace_set_options(tracee, engine, options);
WARN_ON(err && !tracee->exit_state);
@@ -645,7 +647,7 @@ int ptrace_attach(struct task_struct *ta
goto unlock_tasklist;
BUG_ON(task->ptrace);
- task->ptrace = PT_PTRACED;
+ task->ptrace = PT_UTRACED;
if (capable(CAP_SYS_PTRACE))
task->ptrace |= PT_PTRACE_CAP;
@@ -664,7 +666,7 @@ out:
/**
* ptrace_traceme -- helper for PTRACE_TRACEME
*
- * Performs checks and sets PT_PTRACED.
+ * Performs checks and sets PT_UTRACED.
* Should be used by all ptrace implementations for PTRACE_TRACEME.
*/
int ptrace_traceme(void)
@@ -685,7 +687,7 @@ int ptrace_traceme(void)
* pretend ->real_parent untraces us right after return.
*/
if (!ret && !(current->real_parent->flags & PF_EXITING)) {
- current->ptrace = PT_PTRACED;
+ current->ptrace = PT_UTRACED;
__ptrace_link(current, current->real_parent);
detach = false;
}
