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    Subject[RFC PATCH 00/12 v3] ptrace: introduce task_struct->ptrace_cxt

    04/12: move kfree() outside of task_lock() in alloc_ptrace_context().
    But I misread your sugesstion:

    > task_lock(tsk);
    > if (likely(!tsk->ptrace_ctx)) {
    > tsk->ptrace_ctx = ptrace_ctx;
    > task_unlock(tsk);
    > return 0;
    > }
    > task_unlock(tsk);
    > kfree(ptrace_ctx);

    Just can't do that. I hate multiple unlocks very much. So it

    if (likely(!tsk->ptrace_ctx)) {
    tsk->ptrace_ctx = ptrace_ctx;
    ptrace_ctx = NULL;

    kfree(NULL) is specially allowed.

    05/12: Add the comment about tracehook_init_task to ptrace_init_task().

    I didn't change the original comment, but imho it is confusing.
    "immediately after adding @child to its parent's children list"
    does not matter. What does matter, is that it is called before
    this child is visible to the user-space and thus the unconditional
    ptrace_link() is safe: nobody could attach before us.

    08/12: No changes, but I think it better to change format_mca_init_stack()
    right now. Imho it has nothing to do with tracehooks and it is the
    last user of ->parent (except perhaps there are some in arch/ code
    which should be tracehookfied).

    09/12: Remove the stale "pt_" from the changelog.


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