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Date: Sat, 29 Apr 2017 22:05:29 -0700 From: Matthew Wilcox <willy@...radead.org> To: Laurent Dufour <ldufour@...ux.vnet.ibm.com> Cc: paulmck@...ux.vnet.ibm.com, peterz@...radead.org, akpm@...ux-foundation.org, kirill@...temov.name, ak@...ux.intel.com, mhocko@...nel.org, dave@...olabs.net, jack@...e.cz, linux-kernel@...r.kernel.org, linux-mm@...ck.org, haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com, npiggin@...il.com, bsingharora@...il.com Subject: Re: [RFC v3 05/17] RCU free VMAs 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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