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    SubjectRe: [PATCH] Fix check after use in kernel/exit.c

    * Ingo Molnar <mingo@elte.hu> wrote:

    > > @@ -582,9 +582,9 @@ static void exit_mm(struct task_struct * tsk)
    > > {
    > > struct mm_struct *mm = tsk->mm;
    > >
    > > - mm_release(tsk, mm);
    > > if (!mm)
    > > return;
    > > + mm_release(tsk, mm);
    >
    > thanks, applied. I'm wondering why this never seems to hit in
    > practice.

    actually, i unapplied it again because the patch is wrong: mm_release()
    has side-effects for kernel threads such as the deactivate_mm() [which
    is important even if the user-mm is NULL]. If the NULL mm dereference
    can really trigger then it should be avoided within mm_release().

    Ingo


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