Messages in this thread |  | | Date | Sat, 29 Apr 2017 22:05:29 -0700 | From | Matthew Wilcox <> | Subject | Re: [RFC v3 05/17] RCU free VMAs |
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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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