On 30/04/2017 07:05, Matthew Wilcox wrote:
> 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).
This makes sense.
Thanks,
Laurent
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