On Thu, Apr 27, 2017 at 05:52:44PM +0200, Laurent Dufour wrote:
> +static inline bool vma_is_dead(struct vm_area_struct *vma, unsigned int sequence)
> +{
> + int ret = RB_EMPTY_NODE(&vma->vm_rb);
> + unsigned seq = ACCESS_ONCE(vma->vm_sequence.sequence);
> +
> + /*
> + * Matches both the wmb in write_seqlock_{begin,end}() and
> + * the wmb in vma_rb_erase().
> + */
> + smp_rmb();
> +
> + return ret || seq != sequence;
> +}
Hang on, this isn't vma_is_dead(). This is vma_has_changed() (possibly
from live to dead, but also possibly grown or shrunk; see your earlier
patch).
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